1ppf

X-RAY CRYSTAL STRUCTURE OF THE COMPLEX OF HUMAN LEUKOCYTE ELASTASE (PMN ELASTASE) AND THE THIRD DOMAIN OF THE TURKEY OVOMUCOID INHIBITOR

Method: X-RAY DIFFRACTION D_max: 65.9 Å Quality: GOOD

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1. Protein Identity and Related Structures Protein Identity & Related Structures

HUMAN LEUKOCYTE ELASTASE

Homo sapiens

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 2 其他Polymer 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain E； UniProt 30–247	Not recorded	TURKEY OVOMUCOID INHIBITOR (OMTKY3) × 1 （P01004） ;beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose ; × 1 ;alpha-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose ; × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions	Resolution 1.80 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 1PPF	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1B0F CRYSTAL STRUCTURE OF HUMAN NEUTROPHIL ELASTASE WITH MDL 101, 146 Deposited 1998-11-09	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	SEI 1-{3-METHYL-2-[4-(MORPHOLINE-4-CARBONYL)-BENZOYLAMINO]-BUTYRYL}-PYRROLIDINE-2-CARBOXYLIC ACID (3,3,4,4,4-PENTAFLUORO-1-ISOPROPYL-2-OXO-BUTYL)-AMIDE × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 5；pH 5.00	Resolution 3.00 Å
1H1B Crystal structure of human neutrophil elastase complexed with an inhibitor (GW475151) Deposited 2002-07-05	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 30–50（21 aa） Chain A 51–108（58 aa） Chain A 109–110（2 aa） Chain A 111–160（50 aa） Chain A 161–174（14 aa） Chain A 175–183（9 aa） Chain A 184–200（17 aa） Chain A 201–202（2 aa） Chain A 203–247（45 aa） Chain B 30–50（21 aa） Chain B 51–108（58 aa） Chain B 109–110（2 aa） Chain B 111–160（50 aa） Chain B 161–174（14 aa） Chain B 175–183（9 aa） Chain B 184–200（17 aa） Chain B 201–202（2 aa） Chain B 203–247（45 aa）	Not recorded	151 (2S)-3-METHYL-2-((2R,3S)-3-[(METHYLSULFONYL)AMINO]-1-{[2-(PYRROLIDIN-1-YLMETHYL)-1,3-OXAZOL-4-YL]CARBONYL}PYRROLIDIN-2-YL)BUTANOIC ACID × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4；HNE/GW475151 COMPLEX 10MG/ML IN 10MM NA CITRATE PH 5.0. HANGING DROPS OF EQUAL VOLUMES OF PROTEIN AND PRECIPITANT. PRECIPITANT 1.1-1.2M AMMONIUM SULPHATE, 100MM CITRATE PH 3.8-4.0, ROOM TEMP.	Resolution 2.00 Å R-free 0.310
1HNE Structure of human neutrophil elastase in complex with a peptide chloromethyl ketone inhibitor at 1.84-angstroms resolution Deposited 1989-04-10	Different oligomeric state Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric	Chain E 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 1.84 Å
1PPG The refined 2.3 angstroms crystal structure of human leukocyte elastase in a complex with a valine chloromethyl ketone inhibitor Deposited 1991-10-24	Different oligomeric state Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric	Chain E 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å
1PPG The refined 2.3 angstroms crystal structure of human leukocyte elastase in a complex with a valine chloromethyl ketone inhibitor Deposited 1991-10-24	Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å
2RG3 Covalent complex structure of elastase Deposited 2007-10-02	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	EPE 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 7；293 K；PEG, HEPES, pH 7.0, VAPOR DIFFUSION, temperature 293K	Resolution 1.80 Å
2Z7F Crystal structure of the complex of human neutrophil elastase with 1/2SLPI Deposited 2007-08-20	Different construct Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 30–247（218 aa） Fragment：Peptidase S1 domain	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 4.5；293 K；0.1M Na-Acetate, 2.0M Na-Formate, pH 4.5, VAPOR DIFFUSION, SITTING DROP, temperature 293.0K	Resolution 1.70 Å R-free 0.231
3Q76 Structure of human neutrophil elastase (uncomplexed) Deposited 2011-01-04	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 SO4 SULFATE ION × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；1.9 M ammonium sulfate, 5% w/v PEG400, 0.1 M MES-NaOH, 20% v/v glycerol, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 1.86 Å R-free 0.214
3Q76 Structure of human neutrophil elastase (uncomplexed) Deposited 2011-01-04	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain B 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 SO4 SULFATE ION × 5	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；1.9 M ammonium sulfate, 5% w/v PEG400, 0.1 M MES-NaOH, 20% v/v glycerol, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 1.86 Å R-free 0.214
3Q77 Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2011-01-04	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 2HY 2-hydroxyethyl (4R)-4-(4-cyanophenyl)-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carboxylate × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；293 K；20% w/v PEG3350, 0.2 M ammonium citrate, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 2.00 Å R-free 0.203
4NZL Extracellular proteins of Staphylococcus aureus inhibit the neutrophil serine proteases Deposited 2013-12-12	Different construct Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 30–247（218 aa） Fragment：mature neutrophil elastase	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 7；298 K；1.0 M succinic acid, 0.1 M Na-HEPES, 1% (w/v) PEG 2000, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.85 Å R-free 0.207
4WVP Crystal structure of an activity-based probe HNE complex Deposited 2014-11-06	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 30–247（218 aa）	Not recorded	SO4 SULFATE ION × 3 EDO 1,2-ETHANEDIOL × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；293 K；0.1M Tris pH8, 0.8M ammonium sulfate	Resolution 1.63 Å R-free 0.169
4WVP Crystal structure of an activity-based probe HNE complex Deposited 2014-11-06	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 6 PDB declaration: hexameric	Chain E 30–247（218 aa）	Not recorded	SO4 SULFATE ION × 9 EDO 1,2-ETHANEDIOL × 18	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；293 K；0.1M Tris pH8, 0.8M ammonium sulfate	Resolution 1.63 Å R-free 0.169
5A09 Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-04-17	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa） Fragment：RESIDUES 30-247	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 JJD 2-[(4R)-4-(4-cyanophenyl)-5-ethanoyl-6-methyl-2-oxidanylidene-1-[3-(trifluoromethyl)phenyl]-4H-pyrimidin-3-yl]ethanoic acid × 1	X-RAY DIFFRACTION X-ray crystallization conditions 28%PEG4000, 0.1MTRIS/HCL AT PH 8.2, 0.7MLICL	Resolution 1.81 Å R-free 0.239
5A0A Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-04-17	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain E 30–247（218 aa）	Not recorded	JJS 5-[(6R)-5-ethanoyl-4-methyl-2-oxidanylidene-3-[3-(trifluoromethyl)phenyl]-1,6-dihydropyrimidin-6-yl]pyridine-2-carbonitrile × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 EPE 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions 28%PEG4000,0.1MTRIS/HCL AT PH 8.2,0.7MLICL	Resolution 1.78 Å R-free 0.204
5A0B Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-04-17	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 JJX (4R)-4-(4-cyanophenyl)-6-methyl-2-oxidanylidene-3-[2-oxidanylidene-2-(4-propan-2-ylpiperazin-1-yl)ethyl]-1-[3-(trifluoromethyl)phenyl]-4H-pyrimidine-5-carbonitrile × 1 DMS DIMETHYL SULFOXIDE × 1	X-RAY DIFFRACTION X-ray crystallization conditions 15% PEG6000, 0.2M AMMONIUM CITRATE	Resolution 2.23 Å R-free 0.218
5A0C Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-04-17	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa） Fragment：UNP RESIDUES 30-247	Not recorded	JJV (6S)-6-(4-cyano-2-methylsulfonyl-phenyl)-4-methyl-2-oxidanylidene-3-[3-(trifluoromethyl)phenyl]-1,6-dihydropyrimidine-5-carbonitrile × 1 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1 XPE 3,6,9,12,15,18,21,24,27-NONAOXANONACOSANE-1,29-DIOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions 0.1M MES AT PH6.5,1.2M SODIUMMALONATE	Resolution 2.10 Å R-free 0.213
5A0C Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-04-17	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain B 30–247（218 aa） Fragment：UNP RESIDUES 30-247	Not recorded	JJV (6S)-6-(4-cyano-2-methylsulfonyl-phenyl)-4-methyl-2-oxidanylidene-3-[3-(trifluoromethyl)phenyl]-1,6-dihydropyrimidine-5-carbonitrile × 1 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions 0.1M MES AT PH6.5,1.2M SODIUMMALONATE	Resolution 2.10 Å R-free 0.213
5A8X Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-07-17	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 IUY ethyl (5R)-5-(4-cyanophenyl)-7-methyl-8-[3-(trifluoromethyl)phenyl]-1,5-dihydroimidazo[1,2-a]pyrimidin-4-ium-6-carboxylate × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.23 Å R-free 0.223
5A8Y Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-07-17	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	VBM METHYL {(7R)-6-CYANO-7-(4-CYANOPHENYL)-5-METHYL-4-[3-(TRIFLUOROMETHYL)PHENYL]-4,7-DIHYDRO[1,2,4]TRIAZOLO[1,5-A]PYRIMIDIN-2-YL}CARBAMATE × 1 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1 MLI MALONATE ION × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 1.90 Å R-free 0.221
5A8Z Crystal Structure of human neutrophil elastase in complex with a dihydropyrimidone inhibitor Deposited 2015-07-17	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 IUL 4-[(4R)-7-methyl-2,5-bis(oxidanylidene)-1-[3-(trifluoromethyl)phenyl]-3,4,6,8-tetrahydropyrimido[4,5-d]pyridazin-4-yl]benzenecarbonitrile × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.00 Å R-free 0.236
5ABW Neutrophil elastase inhibitors for the treatment of (cardio)pulmonary diseases Deposited 2015-08-10	Different construct Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa） Fragment：UNP RESIDUES 30-247	Not recorded	WQQ 1-(3-CHLOROPHENYL)-5-(3,5-DIMETHYLISOXAZOL-4-YL)-6-METHYL-N-[4-(METHYLSULFONYL)BENZYL]-2-OXO-1,2-DIHYDROPYRIDINE-3-CARBOXAMIDE × 1 CL CHLORIDE ION × 3	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 1.60 Å R-free 0.194
6E69 Ortho-substituted phenyl sulfonyl fluoride and fluorosulfate as potent elastase inhibitory fragments Deposited 2018-07-24	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	HVP 2-(fluorosulfonyl)benzene-1-sulfonic acid × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；0.3 M ammonium citrate, pH 5.0, 14% w/v PEG3350	Resolution 2.33 Å R-free 0.241
6E69 Ortho-substituted phenyl sulfonyl fluoride and fluorosulfate as potent elastase inhibitory fragments Deposited 2018-07-24	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain B 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	HVP 2-(fluorosulfonyl)benzene-1-sulfonic acid × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；0.3 M ammonium citrate, pH 5.0, 14% w/v PEG3350	Resolution 2.33 Å R-free 0.241
6E69 Ortho-substituted phenyl sulfonyl fluoride and fluorosulfate as potent elastase inhibitory fragments Deposited 2018-07-24	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain C 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	HVP 2-(fluorosulfonyl)benzene-1-sulfonic acid × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；0.3 M ammonium citrate, pH 5.0, 14% w/v PEG3350	Resolution 2.33 Å R-free 0.241
6E69 Ortho-substituted phenyl sulfonyl fluoride and fluorosulfate as potent elastase inhibitory fragments Deposited 2018-07-24	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain D 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	HVP 2-(fluorosulfonyl)benzene-1-sulfonic acid × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；0.3 M ammonium citrate, pH 5.0, 14% w/v PEG3350	Resolution 2.33 Å R-free 0.241
6F5M Crystal structure of highly glycosylated human leukocyte elastase in complex with a thiazolidinedione inhibitor Deposited 2017-12-01	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	SO4 SULFATE ION × 2 ACT ACETATE ION × 2 CQH 5-[[4-[[(2~{S})-4-methyl-1-oxidanylidene-1-[(2-propylphenyl)amino]pentan-2-yl]carbamoyl]phenyl]methyl]-2-oxidanylidene-1,3-thiazol-1-ium-4-olate × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；HLE from human blood was purchased from SERVA as a lyophilisate in the presence of sodium acetate puffer, pH 5.5. The lyophilisate was disolved in water so that the HLE concentration was 5 mg/ml (170 micromolar) and the acetate concentration 250 millimolar. 120 microliter dissolved HNE lysophilisate was mixed with 6 microliter inhibitor solution (10 mM in DMSO). 1 microliter of the resulting HLE/inhibitor mixture was mixed with 0.5 microliter reservoir solution which was composed of 20 % PEG MME 5000, 0.2 M potassium sulphate. Repeated seeding was necessary to get usable crystals. In the final seeding step the reservoir was composed of 20 % PEG MME 5000, 0.2 M sodium sulphate.	Resolution 2.70 Å R-free 0.234
6F5M Crystal structure of highly glycosylated human leukocyte elastase in complex with a thiazolidinedione inhibitor Deposited 2017-12-01	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain B 30–247（218 aa）	Not recorded	SO4 SULFATE ION × 2 ACT ACETATE ION × 1 CQH 5-[[4-[[(2~{S})-4-methyl-1-oxidanylidene-1-[(2-propylphenyl)amino]pentan-2-yl]carbamoyl]phenyl]methyl]-2-oxidanylidene-1,3-thiazol-1-ium-4-olate × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；HLE from human blood was purchased from SERVA as a lyophilisate in the presence of sodium acetate puffer, pH 5.5. The lyophilisate was disolved in water so that the HLE concentration was 5 mg/ml (170 micromolar) and the acetate concentration 250 millimolar. 120 microliter dissolved HNE lysophilisate was mixed with 6 microliter inhibitor solution (10 mM in DMSO). 1 microliter of the resulting HLE/inhibitor mixture was mixed with 0.5 microliter reservoir solution which was composed of 20 % PEG MME 5000, 0.2 M potassium sulphate. Repeated seeding was necessary to get usable crystals. In the final seeding step the reservoir was composed of 20 % PEG MME 5000, 0.2 M sodium sulphate.	Resolution 2.70 Å R-free 0.234
6SMA Crystal structure of Human Neutrophil Elastase (HNE) in complex with the 3-Oxo-beta-Sultam inhibitor LMC249 Deposited 2019-08-21	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	BR BROMIDE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；293.15 K；24% PEG Smear Broad 0.1 M Tris-HCl pH 7.2 0.1 M KSCN 0.1M NaBr	Resolution 2.59 Å R-free 0.258
6SMA Crystal structure of Human Neutrophil Elastase (HNE) in complex with the 3-Oxo-beta-Sultam inhibitor LMC249 Deposited 2019-08-21	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain B 30–247（218 aa）	Not recorded	BR BROMIDE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；293.15 K；24% PEG Smear Broad 0.1 M Tris-HCl pH 7.2 0.1 M KSCN 0.1M NaBr	Resolution 2.59 Å R-free 0.258
6SMA Crystal structure of Human Neutrophil Elastase (HNE) in complex with the 3-Oxo-beta-Sultam inhibitor LMC249 Deposited 2019-08-21	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain C 30–247（218 aa）	Not recorded	BR BROMIDE ION × 2 LKK 3-[[1-[(4-bromophenyl)methyl]-1,2,3-triazol-4-yl]methylcarbamoyl]pentane-3-sulfonic acid × 1 EDO 1,2-ETHANEDIOL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；293.15 K；24% PEG Smear Broad 0.1 M Tris-HCl pH 7.2 0.1 M KSCN 0.1M NaBr	Resolution 2.59 Å R-free 0.258
7CBK Structure of Human Neutrophil Elastase Ecotin complex Deposited 2020-06-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric	Chain B 1–267（267 aa） Chain D 1–267（267 aa）	Not recorded	GOL GLYCEROL × 1 SO4 SULFATE ION × 2 MG MAGNESIUM ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；298 K；0.2 M Ammonium sulfate, 0.1 M BIS-TRIS pH 5.5 and 25% w/v Polyethylene glycol 3,350	Resolution 2.70 Å R-free 0.266
7WHU Human Neutrophil Elastase in-complex with Ecotin Peptide Deposited 2021-12-31	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain D 1–267（267 aa）	Not recorded	GOL GLYCEROL × 1 SO4 SULFATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；297 K；0.2 M Ammonium sulfate, 0.1 M BIS-TRIS pH 5.5 and 25% w/v Polyethylene glycol 3350 (PEG3350)	Resolution 2.89 Å R-free 0.306
7WHU Human Neutrophil Elastase in-complex with Ecotin Peptide Deposited 2021-12-31	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–267（267 aa）	Not recorded	GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；297 K；0.2 M Ammonium sulfate, 0.1 M BIS-TRIS pH 5.5 and 25% w/v Polyethylene glycol 3350 (PEG3350)	Resolution 2.89 Å R-free 0.306
7WHU Human Neutrophil Elastase in-complex with Ecotin Peptide Deposited 2021-12-31	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–267（267 aa）	Not recorded	GOL GLYCEROL × 3 SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；297 K；0.2 M Ammonium sulfate, 0.1 M BIS-TRIS pH 5.5 and 25% w/v Polyethylene glycol 3350 (PEG3350)	Resolution 2.89 Å R-free 0.306
7WHU Human Neutrophil Elastase in-complex with Ecotin Peptide Deposited 2021-12-31	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 1–267（267 aa）	Not recorded	GOL GLYCEROL × 1 SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；297 K；0.2 M Ammonium sulfate, 0.1 M BIS-TRIS pH 5.5 and 25% w/v Polyethylene glycol 3350 (PEG3350)	Resolution 2.89 Å R-free 0.306
8D4Q Crystal Structure of Neutrophil Elastase Inhibited by Eap1 from S. aureus Deposited 2022-06-02	Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.2；293 K；0.1M sodium citrate (pH 5.2), 12% (w/v) PEG-6000	Resolution 2.20 Å R-free 0.217
8D4Q Crystal Structure of Neutrophil Elastase Inhibited by Eap1 from S. aureus Deposited 2022-06-02	Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.2；293 K；0.1M sodium citrate (pH 5.2), 12% (w/v) PEG-6000	Resolution 2.20 Å R-free 0.217
8D4U Crystal Structure of Neutrophil Elastase Inhibited by Eap2 from S. aureus Deposited 2022-06-02	Different construct Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；293 K；0.1M HEPES (pH 7.5), 0.2M Lithium Sulfate, 25%(w/v) PEG-3350	Resolution 1.90 Å R-free 0.230
8D4U Crystal Structure of Neutrophil Elastase Inhibited by Eap2 from S. aureus Deposited 2022-06-02	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；293 K；0.1M HEPES (pH 7.5), 0.2M Lithium Sulfate, 25%(w/v) PEG-3350	Resolution 1.90 Å R-free 0.230
8D7I Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap1 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.9；293 K；0.1M BisTris, 0.2M sodium/potassium tartrate, 14% PEG-8000	Resolution 3.63 Å R-free 0.217
8D7I Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap1 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain D 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.9；293 K；0.1M BisTris, 0.2M sodium/potassium tartrate, 14% PEG-8000	Resolution 3.63 Å R-free 0.217
8D7I Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap1 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain G 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.9；293 K；0.1M BisTris, 0.2M sodium/potassium tartrate, 14% PEG-8000	Resolution 3.63 Å R-free 0.217
8D7I Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap1 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain J 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.9；293 K；0.1M BisTris, 0.2M sodium/potassium tartrate, 14% PEG-8000	Resolution 3.63 Å R-free 0.217
8D7I Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap1 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 5 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain M 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.9；293 K；0.1M BisTris, 0.2M sodium/potassium tartrate, 14% PEG-8000	Resolution 3.63 Å R-free 0.217
8D7I Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap1 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 6 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain P 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.9；293 K；0.1M BisTris, 0.2M sodium/potassium tartrate, 14% PEG-8000	Resolution 3.63 Å R-free 0.217
8D7K Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap2 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 3.6；293 K；0.1M Citric acid, 0.15M Lithium Sulfate, 12% PEG-6000	Resolution 3.10 Å R-free 0.258
8D7K Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap2 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain D 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 3.6；293 K；0.1M Citric acid, 0.15M Lithium Sulfate, 12% PEG-6000	Resolution 3.10 Å R-free 0.258
8D7K Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap2 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain G 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 3.6；293 K；0.1M Citric acid, 0.15M Lithium Sulfate, 12% PEG-6000	Resolution 3.10 Å R-free 0.258
8D7K Bifunctional Inhibition of Neutrophil Elastase and Cathepsin G by Eap2 from S. aureus Deposited 2022-06-07	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain J 30–247（218 aa） Fragment：UNP residues 30-247	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 3.6；293 K；0.1M Citric acid, 0.15M Lithium Sulfate, 12% PEG-6000	Resolution 3.10 Å R-free 0.258
8G24 Crystal Structure of Cathepsin-G and Neutrophil Elastase Inhibited by S. aureus EapH2 at pH 5.5 Deposited 2023-02-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；293 K；0.1 M Bis-Tris, 0.2 M sodium chloride, 26% w/v PDB3350	Resolution 1.82 Å R-free 0.249
8G25 Crystal Structure of Cathepsin-G and Neutrophil Elastase Inhibited by S. aureus EapH2 at pH 7.5 Deposited 2023-02-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.1 M HEPES, 0.2 M lithium sulfate, 26% w/v PEG3350	Resolution 1.80 Å R-free 0.283
8G25 Crystal Structure of Cathepsin-G and Neutrophil Elastase Inhibited by S. aureus EapH2 at pH 7.5 Deposited 2023-02-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain E 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.1 M HEPES, 0.2 M lithium sulfate, 26% w/v PEG3350	Resolution 1.80 Å R-free 0.283
8G25 Crystal Structure of Cathepsin-G and Neutrophil Elastase Inhibited by S. aureus EapH2 at pH 7.5 Deposited 2023-02-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain H 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.1 M HEPES, 0.2 M lithium sulfate, 26% w/v PEG3350	Resolution 1.80 Å R-free 0.283
8G26 Crystal Structure of Cathepsin-G and Neutrophil Elastase Inhibited by S. aureus EapH2 at pH 8.5 Deposited 2023-02-03	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.5；293 K；0.1 M Tris, 0.2 M magnesium chloride, 25% PEG3350	Resolution 1.85 Å R-free 0.238
8QGX Complex between human neutrophil elastase with nanobody NbE201 Deposited 2023-09-06	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 30–247（218 aa）	Not recorded	PO4 PHOSPHATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；The crystals were grown at 20oC using the sitting drop vapor diffusion method. The drop contained 0.2 uL of hNE in complex with NbE201 at a concentration of 15 mg/mL and 0.2 uL of 0.1M HEPES pH7 buffer with 10 per cent (v/v) polyethylene glycol 5000 monomethyl ether and 5 per cent (v/v) tacsimate. The crystals were transferred to a cryoprotectant solution containing 33 per cent (v/v) polyethylene glycol 6000 and 33 per cent (v/v) glycerol before being frozen in liquid nitrogen.	Resolution 2.30 Å R-free 0.271
8VK5 Human Sputum Leucocyte Elastase (uncomplexed) Deposited 2024-01-08	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain E 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.5；296 K；0.2 M Lithium sulfate monohydrate, 0.1 M TRIS hydrochloride pH 8.5, 30% w/v Polyethylene glycol 4,000	Resolution 1.56 Å R-free 0.159
9ASS Crystal Structure of Neutrophil Elastase Inhibited by Eap4 from S. aureus Deposited 2024-02-26	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 30–247（218 aa）	Not recorded	SO4 SULFATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；0.01 M zinc sulfate heptahydrate 0.1M MES (pH 6.5) 25% (v/v) peg-550MME	Resolution 1.75 Å R-free 0.212
9ASX BIFUNCTIONAL INHIBITION OF NEUTROPHIL ELASTASE AND CATHEPSIN G by Eap3 of S. aureus Deposited 2024-02-26	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium citrate 0.1 M imidazole (pH 6.8) 22% (w/v) peg-2kMME	Resolution 1.96 Å R-free 0.228
9ATK BIFUNCTIONAL INHIBITION OF NEUTROPHIL ELASTASE AND CATHEPSIN G by Eap4 of S. aureus Deposited 2024-02-27	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.1 M sodium citrate (pH 5.5) 12% (w/v) PEG-6K	Resolution 2.11 Å R-free 0.233
9ATK BIFUNCTIONAL INHIBITION OF NEUTROPHIL ELASTASE AND CATHEPSIN G by Eap4 of S. aureus Deposited 2024-02-27	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain D 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.1 M sodium citrate (pH 5.5) 12% (w/v) PEG-6K	Resolution 2.11 Å R-free 0.233
9ATK BIFUNCTIONAL INHIBITION OF NEUTROPHIL ELASTASE AND CATHEPSIN G by Eap4 of S. aureus Deposited 2024-02-27	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain G 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.1 M sodium citrate (pH 5.5) 12% (w/v) PEG-6K	Resolution 2.11 Å R-free 0.233
9ATK BIFUNCTIONAL INHIBITION OF NEUTROPHIL ELASTASE AND CATHEPSIN G by Eap4 of S. aureus Deposited 2024-02-27	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain J 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.1 M sodium citrate (pH 5.5) 12% (w/v) PEG-6K	Resolution 2.11 Å R-free 0.233
9ATU Bifunctional Inhibition of Neutrophil Elastase by Eap4 from S. aureus Deposited 2024-02-27	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 2 PDB declaration: dimeric	Chain C 30–247（218 aa） Chain F 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium acetate 0.1 M Tris-HCl (pH 8.0) 17% (w/v) PEG-10K	Resolution 2.05 Å R-free 0.237
9ATU Bifunctional Inhibition of Neutrophil Elastase by Eap4 from S. aureus Deposited 2024-02-27	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 6 PDB declaration: hexameric	Chain A 30–247（218 aa） Chain C 30–247（218 aa） Chain D 30–247（218 aa） Chain F 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium acetate 0.1 M Tris-HCl (pH 8.0) 17% (w/v) PEG-10K	Resolution 2.05 Å R-free 0.237
9ATU Bifunctional Inhibition of Neutrophil Elastase by Eap4 from S. aureus Deposited 2024-02-27	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 3 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 30–247（218 aa） Chain C 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium acetate 0.1 M Tris-HCl (pH 8.0) 17% (w/v) PEG-10K	Resolution 2.05 Å R-free 0.237
9ATU Bifunctional Inhibition of Neutrophil Elastase by Eap4 from S. aureus Deposited 2024-02-27	Different experimental conditions Different structure-quality metrics	Assembly 4 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium acetate 0.1 M Tris-HCl (pH 8.0) 17% (w/v) PEG-10K	Resolution 2.05 Å R-free 0.237
9ATU Bifunctional Inhibition of Neutrophil Elastase by Eap4 from S. aureus Deposited 2024-02-27	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 5 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain D 30–247（218 aa） Chain F 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium acetate 0.1 M Tris-HCl (pH 8.0) 17% (w/v) PEG-10K	Resolution 2.05 Å R-free 0.237
9ATU Bifunctional Inhibition of Neutrophil Elastase by Eap4 from S. aureus Deposited 2024-02-27	Different experimental conditions Different structure-quality metrics	Assembly 6 Other combination Heteromer；Protein × 2 PDB declaration: dimeric	Chain D 30–247（218 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium acetate 0.1 M Tris-HCl (pH 8.0) 17% (w/v) PEG-10K	Resolution 2.05 Å R-free 0.237
9SI4 Structure of human neutrophil elastase in complex with a 5,8-dihydro[1,2,4]triazolo[4,3-a]pyrimidin-3(2H)-one inhibitor Deposited 2025-08-28	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 30–247（218 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3 FUC alpha-L-fucopyranose × 1 A1JN2 methyl (5~{R})-5-[4-cyano-2-[2-(trimethyl-$l^{4}-azanyl)ethyl]phenyl]-7-methyl-3-oxidanylidene-8-[3-(trifluoromethyl)phenyl]-2,5-dihydro-[1,2,4]triazolo[4,3-a]pyrimidine-6-carboxylate × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；18% PEG-3350, 0.2M ammonium citrate	Resolution 1.14 Å R-free 0.155

37 other PDB entries and 70 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	ELNE_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain E； PDBConstruct 1–218； UniProt 30–247

TURKEY OVOMUCOID INHIBITOR (OMTKY3)

Meleagris gallopavo

UniProt P01004

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 2 其他Polymer 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain I； UniProt 130–185	Not recorded	HUMAN LEUKOCYTE ELASTASE × 1 （P08246） ;beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose ; × 1 ;alpha-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose ; × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions	Resolution 1.80 Å

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 1PPF	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1M8B Solution structure of the C State of turkey ovomucoid at pH 2.5 Deposited 2002-07-24	Different construct Different mutation/modification Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 130–185（56 aa） Fragment：RESIDUES 130-185; KAZAL-LIKE 3 (INHIBIT CHYMOTRYPIN, ELASTASE, ETC.)	Mutation：P14D	No recorded non-water small molecule	SOLUTION NMR NMR measurement conditions pH 2.5；298 K；Ionic strength (raw mmCIF value) no salt added；Pressure ambient NMR sample composition 1 mM \| 90% H2O/10% D2O NMR sample composition 1 mM \| 100% D2O	Resolution not provided
1M8C SOLUTION STRUCTURE OF THE T State OF TURKEY OVOMUCOID AT PH 2.5 Deposited 2002-07-24	Different construct Different mutation/modification Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 130–185（56 aa） Fragment：RESIDUES 130-185; KAZAL-LIKE 3 (INHIBIT CHYMOTRYPIN, ELASTASE, ETC.)	Mutation：P14D	No recorded non-water small molecule	SOLUTION NMR NMR measurement conditions pH 2.5；298 K；Ionic strength (raw mmCIF value) no salt added；Pressure ambient NMR sample composition 1 mM \| 90% H2O/10% D2O NMR sample composition 1 mM \| 100% D2O	Resolution not provided

2 other PDB entries and 2 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IOVO_MELGA
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain I； PDBConstruct 1–56； UniProt 130–185

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

Download Download SAXS (.dat) P(r) (.pr.out) CIF

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	1ppf
Deposition date deposition_date	1991-10-24
Structure title title	X-RAY CRYSTAL STRUCTURE OF THE COMPLEX OF HUMAN LEUKOCYTE ELASTASE (PMN ELASTASE) AND THE THIRD DOMAIN OF THE TURKEY OVOMUCOID INHIBITOR
Keywords keywords	SERINE PROTEINASE, HYDROLASE-HYDROLASE INHIBITOR COMPLEX; HYDROLASE/HYDROLASE INHIBITOR
Experimental Method method	X-RAY DIFFRACTION

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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	20.12 Å
Radius of gyration Rg (electron density) rg_electron	18.97 Å
Forward intensity I(0) i0	19142100.00
Molecular weight molecular_weight	32152.0 kDa
Excluded volume excluded_volume	39930 Å³
Envelope volume envelope_volume	48989 Å³
Hydration-shell volume shell_volume	21168 Å³
Envelope diameter envelope_diameter	70.9 Å
Shell Rg shell_rg	25.80 Å
Envelope Rg envelope_rg	19.55 Å
Shape Rg shape_rg	18.93 Å
Total Rg total_rg	20.03 Å
Total atoms total_atoms	2246
Residues n_residues	268
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	65.9 Å
Rg (real space) rg_real	20.03 Å
Rg uncertainty (real space) rg_real_error	0.34 Å
I(0) (real space) i0_real	1.9140e+07
I(0) uncertainty (real space) i0_real_error	2.3830e+05
Rg (reciprocal space) rg_reciprocal	20.05 Å
I(0) (reciprocal space) i0_reciprocal	19140000.0000
Solution quality estimate total_estimate	0.8849
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	2
Primary peak position r_peak_primary	24.5 Å
Skewness Skewness skewness	0.219
Kurtosis Kurtosis kurtosis	-0.353
Angular range angular_range	— – 0.3950 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	6585000.0000
Real-space data points n_real_points	71
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.835; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.996; Smooth: 0.999

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Description description	HUMAN LEUKOCYTE ELASTASE
Molecular weight formula_weight	23319.0 kDa
EC 编号 ec_number	3.4.21.37
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E
Atom count atom_count	2518

IVGGRRARPHAWPFMVSLQLRGGHFCGATLIAPNFVMSAAHCVANVNVRAVRVVLGAHNLSRREPTRQVFAVQRIFENGYDPVNLLNDIVILQLNGSATINANVQVAQLPAQGRRLGNGVQCLAMGWGLLGRNRGIASVLQELNVTVVTSLCRRSNVCTLVRGRQAGVCFGDSGSPLVCNGLIHGIASFVRGGCASGLYPDAFAPVAQFVNWIDSIIQ

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	human
NCBI Class编号 ncbi_taxonomy_id	9606

Entity 2 Entity 2 polymer

Description description	TURKEY OVOMUCOID INHIBITOR (OMTKY3)
Molecular weight formula_weight	6026.8 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I

LAAVSVDCSEYPKPACTLEYRPLCGSDNKTYGNKCNFCNAVVESNGTLTLSHFGKC

来源 Source

来源生物 organism	Meleagris gallopavo
通用名 common_name	turkey
NCBI Class编号 ncbi_taxonomy_id	9103

Entity 3 Entity 3 branched

Description description	;beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose ;
Molecular weight formula_weight	1422.3 kDa
Source method src_method	man
Copy count entity_count	1

Entity 4 Entity 4 branched

Description description	;alpha-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose ;
Molecular weight formula_weight	1422.3 kDa
Source method src_method	man
Copy count entity_count	1

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	272

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7. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1ppfe_
Class class	b — All beta proteins
Fold Fold fold	b.47 — Trypsin-like serine proteases
Superfamily Superfamily superfamily	b.47.1 — Trypsin-like serine proteases
Family Family family	b.47.1.2 — Eukaryotic proteases

Domain ID domain_id	d1ppfi_
Class class	g — Small proteins
Fold Fold fold	g.68 — Kazal-type serine protease inhibitors
Superfamily Superfamily superfamily	g.68.1 — Kazal-type serine protease inhibitors
Family Family family	g.68.1.1 — Ovomucoid domain III-like

CATH v4.4 (3 domains)

Domain ID domain_id	1ppfE01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	10 — Thrombin, subunit H
Homologous superfamily homologous superfamily	10 — Trypsin-like serine proteases

Domain ID domain_id	1ppfE02
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	10 — Thrombin, subunit H
Homologous superfamily homologous superfamily	10 — Trypsin-like serine proteases

Domain ID domain_id	1ppfI00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	60 — Wheat Germ Agglutinin (Isolectin 2); domain 1
Homologous superfamily homologous superfamily	30 —

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8. Citations (5)

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Unit-cell length a length_a	73.050 Å
Unit-cell length b length_b	72.550 Å
Unit-cell length c length_c	52.450 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	—
R_work r_work	0.1660
R_free r_free	—

fit	/app/data/saxs_computation/pp/1ppf/1ppf.fit
pddf	/app/data/pr_computation/pp/1ppf/1ppf.pr.out
profile	/app/data/saxs_computation/pp/1ppf/1ppf.dat

X-RAY CRYSTAL STRUCTURE OF THE COMPLEX OF HUMAN LEUKOCYTE ELASTASE (PMN ELASTASE) AND THE THIRD DOMAIN OF THE TURKEY OVOMUCOID INHIBITOR

1. Protein Identity and Related Structures Protein Identity & Related Structures

HUMAN LEUKOCYTE ELASTASE

State in the Current Structure

Other States of the Same Protein in the Database

TURKEY OVOMUCOID INHIBITOR (OMTKY3)

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

6. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

来源 Source

Entity 2 Entity 2 polymer

Polymer Polymer

来源 Source

Entity 3 Entity 3 branched

Entity 4 Entity 4 branched

Entity 5 Entity 5 water

7. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

CATH v4.4 (3 domains)

8. Citations (5)

9. Files and Curves (10)

Files (7)

Curves (3)