1ldt

COMPLEX OF LEECH-DERIVED TRYPTASE INHIBITOR WITH PORCINE TRYPSIN

Method: X-RAY DIFFRACTION D_max: 60.2 Å Quality: GOOD

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

TRYPSIN

OrganismNot specified

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain T； UniProt 9–231	Not recorded	TRYPTASE INHIBITOR × 1 （P80424） CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions：pH 8；10% PEG 6000, 2.3M PHOSPHATE, PH 8.0	Resolution 1.90 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 1LDT	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1AKS CRYSTAL STRUCTURE OF THE FIRST ACTIVE AUTOLYSATE FORM OF THE PORCINE ALPHA TRYPSIN Deposited 1996-07-24	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 9–133（125 aa） Chain B 134–231（98 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 1.80 Å
1AN1 LEECH-DERIVED TRYPTASE INHIBITOR/TRYPSIN COMPLEX Deposited 1997-06-26	Different mutation/modification Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 9–231（223 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 8.5；30% V/V 2-PROPANOL, 0.2M AMMONIUM ACETATE, 0.1M TRIS-HCL, PH 8.5 ROOM TEMPERATURE 27 MONTHS FOR GROWTH.	Resolution 2.03 Å R-free 0.228
1AVW COMPLEX PORCINE PANCREATIC TRYPSIN/SOYBEAN TRYPSIN INHIBITOR, ORTHORHOMBIC CRYSTAL FORM Deposited 1997-09-21	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.5；pH 7.5	Resolution 1.75 Å R-free 0.214
1AVX COMPLEX PORCINE PANCREATIC TRYPSIN/SOYBEAN TRYPSIN INHIBITOR, TETRAGONAL CRYSTAL FORM Deposited 1997-09-21	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；pH 6.5	Resolution 1.90 Å R-free 0.280
1C9P COMPLEX OF BDELLASTASIN WITH PORCINE TRYPSIN Deposited 1999-08-03	Different mutation/modification Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；293 K；0.1M HEPES, 10% 2-PROPANOL, 20% PEG 4000, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 2.80 Å R-free 0.227
1EJA STRUCTURE OF PORCINE TRYPSIN COMPLEXED WITH BDELLASTASIN, AN ANTISTASIN-TYPE INHIBITOR Deposited 2000-03-02	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	NA SODIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.7；298 K；4.0 M Na-formate, pH 7.7, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 2.70 Å R-free 0.248
1EPT REFINED 1.8 ANGSTROMS RESOLUTION CRYSTAL STRUCTURE OF PORCINE EPSILON-TRYPSIN Deposited 1994-06-07	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 3 PDB declaration: trimeric	Chain A 9–51（43 aa） Chain B 52–133（82 aa） Chain C 134–231（98 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 1.80 Å
1FMG CRYSTAL STRUCTURE OF PORCINE BETA TRYPSIN WITH 0.04% POLYDOCANOL Deposited 2000-08-17	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 SO4 SULFATE ION × 1 EDO 1,2-ETHANEDIOL × 5	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；pH 6.70, VAPOR DIFFUSION, HANGING DROP	Resolution 1.90 Å R-free 0.234
1FN6 CRYSTAL STRUCTURE OF PORCINE BETA TRYPSIN WITH 0.1% POLYDOCANOL Deposited 2000-08-21	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 SO4 SULFATE ION × 1 EDO 1,2-ETHANEDIOL × 2 MOH METHANOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；pH 6.70, VAPOR DIFFUSION, HANGING DROP	Resolution 1.80 Å R-free 0.242
1FNI CRYSTAL STRUCTURE OF PORCINE BETA TRYPSIN WITH 0.01% POLYDOCANOL Deposited 2000-08-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	SO4 SULFATE ION × 1 CA CALCIUM ION × 1 EDO 1,2-ETHANEDIOL × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；pH 6.70, VAPOR DIFFUSION, HANGING DROP	Resolution 1.60 Å R-free 0.233
1H9H COMPLEX OF EETI-II WITH PORCINE TRYPSIN Deposited 2001-03-12	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.7；pH 6.70	Resolution 1.50 Å R-free 0.276
1H9I COMPLEX OF EETI-II MUTANT WITH PORCINE TRYPSIN Deposited 2001-03-12	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.7；pH 6.70	Resolution 1.90 Å R-free 0.175
1MCT THE REFINED 1.6 ANGSTROMS RESOLUTION CRYSTAL STRUCTURE OF THE COMPLEX FORMED BETWEEN PORCINE BETA-TRYPSIN AND MCTI-A, A TRYPSIN INHIBITOR OF SQUASH FAMILY Deposited 1992-10-24	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 1.60 Å
1QQU CRYSTAL STRUCTURE OF PORCINE BETA TRYPSIN WITH BOUND ACETATE ION Deposited 1999-06-09	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 ACT ACETATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.7；pH 6.70	Resolution 1.63 Å R-free 0.255
1S5S Porcine trypsin complexed with guanidine-3-propanol inhibitor Deposited 2004-01-21	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 PG3 GUANIDINE-3-PROPANOL × 1 GOL GLYCEROL × 3	X-RAY DIFFRACTION X-ray crystallization conditions pH 8；298 K；1.8M MgSO4, 50mM HEPES, 5mM CaCl2, pH 8.0, VAPOR DIFFUSION, SITTING DROP, temperature 298K, pH 8.00	Resolution 1.40 Å R-free 0.181
1S6F PORCINE TRYPSIN COVALENT COMPLEX WITH BORATE AND GUANIDINE-3 INHIBITOR Deposited 2004-01-23	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 SO4 SULFATE ION × 2 SBP [3-(1,3,2-DIOXABOROLAN-2-YLOXY)PROPYL]GUANIDINE × 1 EDO 1,2-ETHANEDIOL × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；1.8M MgCl2, 50mM HEPES, 5mM CaCl2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 1.80 Å R-free 0.198
1S6H PORCINE TRYPSIN COMPLEXED WITH GUANIDINE-3-PROPANOL INHIBITOR Deposited 2004-01-23	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	SO4 SULFATE ION × 2 CA CALCIUM ION × 1 MG MAGNESIUM ION × 1 4BZ 4-(HYDROXYMETHYL)BENZAMIDINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；1.8M MgCl2, 50mM HEPES, 5mM CaCl2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 1.45 Å R-free 0.179
1S81 PORCINE TRYPSIN WITH NO INHIBITOR BOUND Deposited 2004-01-30	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 NA SODIUM ION × 1 SO4 SULFATE ION × 1 EDO 1,2-ETHANEDIOL × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；1.8M MgCl2, 50mM HEPES, 5mM CaCl2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 1.70 Å R-free 0.216
1S82 PORCINE TRYPSIN COMPLEXED WITH BORATE AND ETHYLENE GLYCOL Deposited 2004-01-30	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 SO4 SULFATE ION × 2 NA SODIUM ION × 1 EDO 1,2-ETHANEDIOL × 7 SBE 1,3,2-DIOXABOROLAN-2-OL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；1.8M MgCl2, 50mM HEPES, 5mM CaCl2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 1.85 Å R-free 0.214
1S83 PORCINE TRYPSIN COMPLEXED WITH 4-AMINO PROPANOL Deposited 2004-01-30	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 MG MAGNESIUM ION × 2 SO4 SULFATE ION × 1 4HA 4-HYDROXYBUTAN-1-AMINIUM × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；1.8M MgCl2, 50mM HEPES, 5mM CaCl2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 1.25 Å R-free 0.178
1S84 PORCINE TRYPSIN COVALENT COMPLEX WITH 4-AMINO BUTANOL, BORATE AND ETHYLENE GLYCOL Deposited 2004-01-30	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 SO4 SULFATE ION × 3 EDO 1,2-ETHANEDIOL × 6 DYB 4-(1,3,2-DIOXABOROLAN-2-YLOXY)BUTAN-1-AMINIUM × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；1.8M MgCl2, 50mM HEPES, 5mM CaCl2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 1.85 Å R-free 0.177
1S85 PORCINE TRYPSIN COMPLEXED WITH P-HYDROXYMETHYL BENZAMIDINE AND BORATE Deposited 2004-01-30	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 SO4 SULFATE ION × 1 SBZ [4-(1,3,2-DIOXABOROLAN-2-YLOXY)METHYL]BENZAMIDINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；1.8M MgCl2, 50mM HEPES, 5mM CaCl2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 2.20 Å R-free 0.254
1TFX COMPLEX OF THE SECOND KUNITZ DOMAIN OF TISSUE FACTOR PATHWAY INHIBITOR WITH PORCINE TRYPSIN Deposited 1997-01-21	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 8；pH 8.0	Resolution 2.60 Å
1TFX COMPLEX OF THE SECOND KUNITZ DOMAIN OF TISSUE FACTOR PATHWAY INHIBITOR WITH PORCINE TRYPSIN Deposited 1997-01-21	Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 8；pH 8.0	Resolution 2.60 Å
1TX6 trypsin:BBI complex Deposited 2004-07-02	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 9–231（223 aa） Chain B 9–231（223 aa）	Not recorded	CA CALCIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.59；291 K；PEG 8000, sodium citrate, DTT, pH 5.59, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.20 Å R-free 0.274
1TX6 trypsin:BBI complex Deposited 2004-07-02	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain C 9–231（223 aa） Chain D 9–231（223 aa）	Not recorded	CA CALCIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.59；291 K；PEG 8000, sodium citrate, DTT, pH 5.59, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.20 Å R-free 0.274
1UHB Crystal structure of porcine alpha trypsin bound with auto catalyticaly produced native peptide at 2.15 A resolution Deposited 2003-06-27	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 3 PDB declaration: trimeric	Chain A 9–133（125 aa） Chain B 134–231（98 aa） Chain P 177–185（9 aa）	Not recorded	CA CALCIUM ION × 1 ACT ACETATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；293 K；1.5M ammonium sulphate, pH 6.70, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 2.15 Å R-free 0.228
1V6D The crystal structure of the trypsin complex with synthetic heterochiral peptide Deposited 2003-11-28	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 ACT ACETATE ION × 1 TBF TERT-BUTYL FORMATE × 1 NME METHYLAMINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.4；293 K；2M ammonium sulphate, pH 6.4, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 1.90 Å R-free 0.178
1YF4 Crystal Structure of trypsin-vasopressin complex Deposited 2004-12-30	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.3；293 K；acetate buffer, pH 6.3, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 1.98 Å R-free 0.226
1Z7K Crystal Structure of Trypsin- Ovomucoid turkey egg white inhibitor complex Deposited 2005-03-25	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 9–231（223 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.3；293 K；1.5M ammonium sulphate, 10mM zinc acetate, 50mM Acetate buffer, pH 5.30, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 1.90 Å R-free 0.188
2A31 Trypsin in complex with borate Deposited 2005-06-23	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 MG MAGNESIUM ION × 3 NA SODIUM ION × 1 SO4 SULFATE ION × 1 BO4 BORATE ION × 2 PG3 GUANIDINE-3-PROPANOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；300 K；MgSO4, HEPES, CaCl2, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 300K	Resolution 1.25 Å R-free 0.162
2A32 Trypsin in complex with benzene boronic acid Deposited 2005-06-23	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 9–231（223 aa）	Not recorded	CA CALCIUM ION × 1 NA SODIUM ION × 1 PG3 GUANIDINE-3-PROPANOL × 1 PBC PHENYL BORONIC ACID × 2 BO4 BORATE ION × 1 CXS 3-CYCLOHEXYL-1-PROPYLSULFONIC ACID × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；300 K；MgSO4, HEPES, CaCl2, the crystal while grown at pH 8.0 was soaked in a solution at pH 10.5 before freezing and data collection. pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 300K	Resolution 1.50 Å R-free 0.188
3MYW The Bowman-Birk type inhibitor from mung bean in ternary complex with porcine trypsin Deposited 2010-05-11	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 9–231（223 aa） Chain B 9–231（223 aa）	Not recorded	CA CALCIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5；293 K；1.5M ammonium sulfate, 0.2M sodium potassium phosphate, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 2.50 Å
4AN7 Kunitz type trypsin inhibitor complex with porcine trypsin Deposited 2012-03-15	Different construct Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions 0.2 M AMMONIUM PHOSPHATE, 20% PEG3350	Resolution 2.23 Å R-free 0.246
4DOQ Crystal structure of the complex of Porcine Pancreatic Trypsin with 1/2SLPI Deposited 2012-02-10	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 9–231（223 aa）	Not recorded	XPE 3,6,9,12,15,18,21,24,27-NONAOXANONACOSANE-1,29-DIOL × 1 SO4 SULFATE ION × 3 CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；298 K；25% PEG4000, 0.1M Na-Citrate, 200mM Ammonium Sulfate, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 2.00 Å R-free 0.242
4DOQ Crystal structure of the complex of Porcine Pancreatic Trypsin with 1/2SLPI Deposited 2012-02-10	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 9–231（223 aa）	Not recorded	SO4 SULFATE ION × 3 CA CALCIUM ION × 1 P6G HEXAETHYLENE GLYCOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；298 K；25% PEG4000, 0.1M Na-Citrate, 200mM Ammonium Sulfate, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 2.00 Å R-free 0.242
4DOQ Crystal structure of the complex of Porcine Pancreatic Trypsin with 1/2SLPI Deposited 2012-02-10	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain E 9–231（223 aa）	Not recorded	SO4 SULFATE ION × 1 CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；298 K；25% PEG4000, 0.1M Na-Citrate, 200mM Ammonium Sulfate, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 2.00 Å R-free 0.242
5XW1 Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, PRN, at pH10 Deposited 2017-06-28	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–133（133 aa） Fragment：UNP residues 1-133 Chain B 134–231（98 aa） Fragment：UNP residues 134-231	Not recorded	CA CALCIUM ION × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 10；300 K；0.1M CHES PH10, 70% MPD	Resolution 1.90 Å R-free 0.173
5XW8 Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, PRN, at pH 7 Deposited 2017-06-29	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–133（133 aa） Fragment：UNP residues 1-133 Chain B 134–231（98 aa） Fragment：UNP residues 134-231	Not recorded	CA CALCIUM ION × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；300 K；0.1M HEPES pH 7.5, 70% MPD	Resolution 2.00 Å R-free 0.178
5XW9 Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, PRY, at pH 7 Deposited 2017-06-29	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–133（133 aa） Fragment：UNP residues 1-133 Chain B 134–231（98 aa） Fragment：UNP residues 134-231	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；300 K；0.1M HEPES pH 7.5, 70% MPD	Resolution 2.00 Å R-free 0.194
5XWA Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, PRY, at pH 10 Deposited 2017-06-29	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–133（133 aa） Fragment：UNP residues 1-133 Chain B 134–231（98 aa） Fragment：UNP residues 134-231	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 10；300 K；0.1M CHES pH 10, 70% MPD	Resolution 1.90 Å R-free 0.182
5XWJ Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, TRE, at pH 7 Deposited 2017-06-29	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；300 K；0.1M HEPES pH7.5, 70% MPD	Resolution 1.80 Å R-free 0.182
5XWJ Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, TRE, at pH 7 Deposited 2017-06-29	Different construct Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；300 K；0.1M HEPES pH7.5, 70% MPD	Resolution 1.80 Å R-free 0.182
5XWL Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, TRE, at pH 10 Deposited 2017-06-29	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 10；300 K；0.1M CHES pH 10, 70% MPD	Resolution 2.10 Å R-free 0.194
5XWL Crystal Structure of Porcine pancreatic trypsin with tripeptide inhibitor, TRE, at pH 10 Deposited 2017-06-29	Different construct Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 10；300 K；0.1M CHES pH 10, 70% MPD	Resolution 2.10 Å R-free 0.194
9CT1 Complex between the porcine trypsin and M271 a Kunitz-STI from Solanum tuberosum Deposited 2024-07-24	Different construct Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions BATCH MODE；pH 4.6；293 K；0.085 M Sodium acetate trihydrate pH 4.6, 0.17 M Ammonium acetate, 25.5% w/v Polyethylene glycol 4,000, 15% v/v Glycerol	Resolution 2.42 Å R-free 0.244
9CT1 Complex between the porcine trypsin and M271 a Kunitz-STI from Solanum tuberosum Deposited 2024-07-24	Different construct Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions BATCH MODE；pH 4.6；293 K；0.085 M Sodium acetate trihydrate pH 4.6, 0.17 M Ammonium acetate, 25.5% w/v Polyethylene glycol 4,000, 15% v/v Glycerol	Resolution 2.42 Å R-free 0.244
9PCT Structure of Porcine Trypsin Crystals Grown from PEG Complexed with Crystallization Additives III Deposited 2025-06-29	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 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1 BEN BENZAMIDINE × 3 FLC CITRATE ANION × 2 PG4 TETRAETHYLENE GLYCOL × 2 PEG DI(HYDROXYETHYL)ETHER × 9 GOL GLYCEROL × 2 PG5 1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE × 5 MLT D-MALATE × 3 PG6 1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE × 2 EPE 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID × 2 ACT ACETATE ION × 3 PO4 PHOSPHATE ION × 1 TAR D(-)-TARTARIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；295 K；Sitting drop vapor diffusion in Cryschem plates with 0.6 ml reservoirs of 30% PEG 3350 buffered at pH 6.5 with 0.1 M HEPES. Drops 3 ul of reservoir, 2 ul of additive mix ( TACSIMATE, glycerol, sucrose, sorbitol), 3 ul of 40 mg/ml stock protein solution buffered at pH 6.5 with 0.1 M HEPES.	Resolution 1.41 Å R-free 0.170
9PD9 The Structure of Porcine Trypsin in Complex with Crystallization Additives I Deposited 2025-06-30	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1 BEN BENZAMIDINE × 4 PG5 1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE × 4 PEG DI(HYDROXYETHYL)ETHER × 15 PG4 TETRAETHYLENE GLYCOL × 8 OXL OXALATE ION × 1 A1CHW 4-aminobenzene-1-sulfonic acid × 1 OXM OXAMIC ACID × 6 PG6 1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；295 K；Sitting drop vapor diffusion in Cryschem plates. Reservoirs 30% PEG 3350. Drops 3.0 ul of reservoir, plus 2 ul additives oxalic acid, sulfanilic acid, 4-amino benzoic acid mix, plus 3.0 ul of 40 mg/ml stock protein solution of 0.1 M HEPES at pH 6.5.	Resolution 1.28 Å R-free 0.147
9PDA Structure of Porcine Trypsin Crystals Grown From PEG and Complexed With Crystallization Additives IV Deposited 2025-06-30	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–231（231 aa）	Not recorded	BEN BENZAMIDINE × 1 PG5 1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE × 3 PG6 1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE × 1 PEG DI(HYDROXYETHYL)ETHER × 8 CA CALCIUM ION × 1 MLI MALONATE ION × 1 PG4 TETRAETHYLENE GLYCOL × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；295 K；Sitting drop vapor diffusion in Cryschem plates with reservoirs of 30% PEG 3350 buffered at pH 6.5 with 0.1 M HEPES. Drops composed of 3 ul reservoir, 2 ul of additive mix (oxalic acid, malic acid, oxaloacetic acid, pyromellitic acid), and 3 ul of a 40 mg/ml protein stock	Resolution 1.18 Å R-free 0.230
9PDA Structure of Porcine Trypsin Crystals Grown From PEG and Complexed With Crystallization Additives IV Deposited 2025-06-30	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–231（231 aa）	Not recorded	BEN BENZAMIDINE × 3 PG5 1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE × 4 PEG DI(HYDROXYETHYL)ETHER × 18 CA CALCIUM ION × 1 MLI MALONATE ION × 1 PG4 TETRAETHYLENE GLYCOL × 3 PMA PYROMELLITIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；295 K；Sitting drop vapor diffusion in Cryschem plates with reservoirs of 30% PEG 3350 buffered at pH 6.5 with 0.1 M HEPES. Drops composed of 3 ul reservoir, 2 ul of additive mix (oxalic acid, malic acid, oxaloacetic acid, pyromellitic acid), and 3 ul of a 40 mg/ml protein stock	Resolution 1.18 Å R-free 0.230
9PDA Structure of Porcine Trypsin Crystals Grown From PEG and Complexed With Crystallization Additives IV Deposited 2025-06-30	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain C 1–231（231 aa）	Not recorded	BEN BENZAMIDINE × 3 PG5 1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE × 2 PEG DI(HYDROXYETHYL)ETHER × 15 CA CALCIUM ION × 1 MLI MALONATE ION × 1 PG4 TETRAETHYLENE GLYCOL × 5 EPE 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；295 K；Sitting drop vapor diffusion in Cryschem plates with reservoirs of 30% PEG 3350 buffered at pH 6.5 with 0.1 M HEPES. Drops composed of 3 ul reservoir, 2 ul of additive mix (oxalic acid, malic acid, oxaloacetic acid, pyromellitic acid), and 3 ul of a 40 mg/ml protein stock	Resolution 1.18 Å R-free 0.230
9PDA Structure of Porcine Trypsin Crystals Grown From PEG and Complexed With Crystallization Additives IV Deposited 2025-06-30	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain D 1–231（231 aa）	Not recorded	BEN BENZAMIDINE × 3 PG5 1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE × 3 PEG DI(HYDROXYETHYL)ETHER × 20 CA CALCIUM ION × 2 MLI MALONATE ION × 1 PG4 TETRAETHYLENE GLYCOL × 6 PMA PYROMELLITIC ACID × 1 EPE 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID × 1 CL CHLORIDE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；295 K；Sitting drop vapor diffusion in Cryschem plates with reservoirs of 30% PEG 3350 buffered at pH 6.5 with 0.1 M HEPES. Drops composed of 3 ul reservoir, 2 ul of additive mix (oxalic acid, malic acid, oxaloacetic acid, pyromellitic acid), and 3 ul of a 40 mg/ml protein stock	Resolution 1.18 Å R-free 0.230
9PDC Porcine Trypsin grown from PEG and Complexed with Crystallization Additives II Deposited 2025-06-30	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–231（231 aa）	Not recorded	CA CALCIUM ION × 1 TLA L(+)-TARTARIC ACID × 2 PEG DI(HYDROXYETHYL)ETHER × 28 PG4 TETRAETHYLENE GLYCOL × 10 PG6 1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE × 2 PG5 1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE × 1 BEN BENZAMIDINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；295 K；Sitting drop vapor diffusion in Cryschem plates. Reservoirs 30% PEG 3350 buffered with 0.1 M HEPES at pH 6.5. Drops 3 ul of reservoir, 2 ul of additive mix ( TACSIMATE, PEG 3350), 3 ul of 40 mg/ml stock protein solution buffered with 0.1 M HEPES pH 6.5.	Resolution 1.27 Å R-free 0.154

44 other PDB entries and 54 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	TRYP_PIG
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain T； PDBConstruct 1–223； UniProt 9–231

TRYPTASE INHIBITOR

Hirudo medicinalis

UniProt P80424

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain L； UniProt 1–46	Not recorded	TRYPSIN × 1 （P00761） CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions：pH 8；10% PEG 6000, 2.3M PHOSPHATE, PH 8.0	Resolution 1.90 Å

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 1LDT	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1AN1 LEECH-DERIVED TRYPTASE INHIBITOR/TRYPSIN COMPLEX Deposited 1997-06-26	Different mutation/modification Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain I 1–46（46 aa）	Mutation：N115D (D-ASPARTIC ACID FORM)	CA CALCIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 8.5；30% V/V 2-PROPANOL, 0.2M AMMONIUM ACETATE, 0.1M TRIS-HCL, PH 8.5 ROOM TEMPERATURE 27 MONTHS FOR GROWTH.	Resolution 2.03 Å R-free 0.228
2KMO Solution structure of native Leech-derived tryptase inhibitor, LDTI Deposited 2009-08-03	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–44（44 aa） Fragment：residues 1-44	Not recorded	No recorded non-water small molecule	SOLUTION NMR NMR measurement conditions pH 1.7；298 K；Pressure ambient NMR sample composition 1.7 mM LDTI, 90% H2O/10% D2O \| 90% H2O/10% D2O NMR sample composition 1.7 mM LDTI, 100% D2O \| 100% D2O	Resolution not provided
2KMP Solution structure of intermeidate IIa of Leeck-derived tryptase inhibitor, LDTI. Deposited 2009-08-03	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–44（44 aa） Fragment：residues 1-44	Not recorded	No recorded non-water small molecule	SOLUTION NMR NMR measurement conditions pH 1.7；298 K；Pressure ambient NMR sample composition 1.7 mM LDTI, 90% H2O/10% D2O \| 90% H2O/10% D2O NMR sample composition 1.7 mM LDTI, 100% D2O \| 100% D2O	Resolution not provided
2KMQ Solution structure of intermediate IIb of Leech-derived tryptase inhibitor, LDTI. Deposited 2009-08-03	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–44（44 aa） Fragment：residues 1-44	Not recorded	No recorded non-water small molecule	SOLUTION NMR NMR measurement conditions pH 1.7；298 K；Pressure ambient NMR sample composition 1.7 mM LDTI-IIb, 90% H2O/10% D2O \| 90% H2O/10% D2O NMR sample composition 1.7 mM LDTI-IIb, 100% D2O \| 100% D2O	Resolution not provided
2KMR Solution structure of intermediate IIc of Leech-derived tryptase inhibitor, LDTI. Deposited 2009-08-03	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–44（44 aa） Fragment：residues 1-44	Not recorded	No recorded non-water small molecule	SOLUTION NMR NMR measurement conditions pH 1.7；298 K；Pressure ambient NMR sample composition 1.7 mM LDTI-IIc, 90% H2O/10% D2O \| 90% H2O/10% D2O NMR sample composition 1.7 mM LDTI-IIc, 100% D2O \| 100% D2O	Resolution not provided

5 other PDB entries and 5 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	LDTI_HIRME
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain L； PDBConstruct 1–46； UniProt 1–46

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	1ldt
Deposition date deposition_date	1997-05-15
Structure title title	COMPLEX OF LEECH-DERIVED TRYPTASE INHIBITOR WITH PORCINE TRYPSIN
Keywords keywords	COMPLEX (HYDROLASE-INHIBITOR), HYDROLASE, INHIBITOR, INFLAMMATION, TRYPTASE, COMPLEX (HYDROLASE-INHIBITOR) complex; COMPLEX (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	18.57 Å
Radius of gyration Rg (electron density) rg_electron	17.48 Å
Forward intensity I(0) i0	15333200.00
Molecular weight molecular_weight	28267.0 kDa
Excluded volume excluded_volume	34910 Å³
Envelope volume envelope_volume	39796 Å³
Hydration-shell volume shell_volume	18752 Å³
Envelope diameter envelope_diameter	60.8 Å
Shell Rg shell_rg	24.06 Å
Envelope Rg envelope_rg	17.79 Å
Shape Rg shape_rg	17.46 Å
Total Rg total_rg	18.48 Å
Total atoms total_atoms	1993
Residues n_residues	266
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	60.2 Å
Rg (real space) rg_real	18.45 Å
Rg uncertainty (real space) rg_real_error	0.42 Å
I(0) (real space) i0_real	1.5330e+07
I(0) uncertainty (real space) i0_real_error	1.9470e+05
Rg (reciprocal space) rg_reciprocal	18.47 Å
I(0) (reciprocal space) i0_reciprocal	15330000.0000
Solution quality estimate total_estimate	0.7811
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	3
Primary peak position r_peak_primary	25.6 Å
Skewness Skewness skewness	0.152
Kurtosis Kurtosis kurtosis	-0.416
Angular range angular_range	— – 0.4300 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	3929000.0000
Real-space data points n_real_points	74
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.760; Stabil: 0.958; Sysdev: 1.000; Positv: 1.000; Valcen: 0.994; Smooth: 0.000

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Description description	TRYPSIN
Molecular weight formula_weight	23493.5 kDa
EC 编号 ec_number	3.4.21.4
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	T
Atom count atom_count	2142

IVGGYTCAANSIPYQVSLNSGSHFCGGSLINSQWVVSAAHCYKSRIQVRLGEHNIDVLEGNEQFINAAKIITHPNFNGNTLDNDIMLIKLSSPATLNSRVATVSLPRSCAAAGTECLISGWGNTKSSGSSYPSLLQCLKAPVLSDSSCKSSYPGQITGNMICVGFLEGGKDSCQGDSGGPVVCNGQLQGIVSWGYGCAQKNKPGVYTKVCNYVNWIQQTIAAN

Entity 2 Entity 2 polymer

Description description	TRYPTASE INHIBITOR
Molecular weight formula_weight	4750.6 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L

KKVCACPKILKPVCGSDGRTYANSCIARCNGVSIKSEGSCPTGILN

来源 Source

来源生物 organism	Hirudo medicinalis
通用名 common_name	medicinal leech
NCBI Class编号 ncbi_taxonomy_id	6421
宿主生物 host_organism	Saccharomyces cerevisiae

Entity 3 Entity 3 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	149

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7. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1ldtl_
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

Domain ID domain_id	d1ldtt_
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

CATH v4.4 (3 domains)

Domain ID domain_id	1ldtL00
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 —

Domain ID domain_id	1ldtT01
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	1ldtT02
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

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8. Citations (4)

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Unit-cell length a length_a	63.400 Å
Unit-cell length b length_b	63.400 Å
Unit-cell length c length_c	131.200 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	8

Space group space_group	P 43 21 2
Space-group number int_tables_number	96
Crystal system crystal_system	—

Resolution resolution	1.900 Å
Low-resolution limit resolution_low	6.000 Å
R factor r_factor	0.1970
R_work r_work	0.1970
R_free r_free	—

fit	/app/data/saxs_computation/ld/1ldt/1ldt.fit
pddf	/app/data/pr_computation/ld/1ldt/1ldt.pr.out
profile	/app/data/saxs_computation/ld/1ldt/1ldt.dat

COMPLEX OF LEECH-DERIVED TRYPTASE INHIBITOR WITH PORCINE TRYPSIN

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

TRYPSIN

State in the Current Structure

Other States of the Same Protein in the Database

TRYPTASE INHIBITOR

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

Diffraction experiment Diffraction

6. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

来源 Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

7. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

CATH v4.4 (3 domains)

8. Citations (4)

9. Files and Curves (10)

Files (7)

Curves (3)