1m4a

Crystal Structure of Human Interleukin-2 Y31C Covalently Modified at C31 with (1H-Indol-3-yl)-(2-mercapto-ethoxyimino)-acetic acid

Method: X-RAY DIFFRACTION D_max: 51.7 Å Quality: GOOD

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

interleukin-2

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	Protein monomer Monomer Protein × 1 PDB declaration: monomeric（1） Consistent with protein copy count	Chain A； UniProt 21–153	Mutation：Y31C	MPE (1H-INDOL-3-YL)-(2-MERCAPTO-ETHOXYIMINO)-ACETIC ACID × 1 GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.18 Å R-free 0.324

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 1M4A	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1IRL THE SOLUTION STRUCTURE OF THE F42A MUTANT OF HUMAN INTERLEUKIN 2 Deposited 1995-08-25	Different mutation/modification 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 21–153（133 aa）	Mutation：F42A	No recorded non-water small molecule	SOLUTION NMR mmCIF provides none of the parsed conditions	Resolution not provided
1M47 Crystal Structure of Human Interleukin-2 Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Not recorded	SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.99 Å R-free 0.245
1M48 Crystal Structure of Human IL-2 Complexed with (R)-N-[2-[1-(Aminoiminomethyl)-3-piperidinyl]-1-oxoethyl]-4-(phenylethynyl)-L-phenylalanine methyl ester Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Not recorded	FRG 2-[3-METHYL-4-(N-METHYL-GUANIDINO)-BUTYRYLAMINO]-3-(4-PHENYLETHYNYL-PHENYL)-PROPIONIC ACID METHYL ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.95 Å R-free 0.269
1M48 Crystal Structure of Human IL-2 Complexed with (R)-N-[2-[1-(Aminoiminomethyl)-3-piperidinyl]-1-oxoethyl]-4-(phenylethynyl)-L-phenylalanine methyl ester Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–153（133 aa）	Not recorded	FRG 2-[3-METHYL-4-(N-METHYL-GUANIDINO)-BUTYRYLAMINO]-3-(4-PHENYLETHYNYL-PHENYL)-PROPIONIC ACID METHYL ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.95 Å R-free 0.269
1M49 Crystal Structure of Human Interleukin-2 Complexed with SP-1985 Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Not recorded	CMM 2-[2-(1-CARBAMIMIDOYL-PIPERIDIN-3-YL)-ACETYLAMINO]-3-{4-[2-(3-OXALYL-1H-INDOL-7-YL)ETHYL]-PHENYL}-PROPIONIC ACID METHYL ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.278
1M49 Crystal Structure of Human Interleukin-2 Complexed with SP-1985 Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–153（133 aa）	Not recorded	CMM 2-[2-(1-CARBAMIMIDOYL-PIPERIDIN-3-YL)-ACETYLAMINO]-3-{4-[2-(3-OXALYL-1H-INDOL-7-YL)ETHYL]-PHENYL}-PROPIONIC ACID METHYL ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.278
1M4B Crystal Structure of Human Interleukin-2 K43C Covalently Modified at C43 with 2-[2-(2-Cyclohexyl-2-guanidino-acetylamino)-acetylamino]-N-(3-mercapto-propyl)-propionamide Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Mutation：K43C	NMP 2-[2-(2-CYCLOHEXYL-2-GUANIDINO-ACETYLAMINO)-ACETYLAMINO]-N-(3-MERCAPTO-PROPYL)-PROPIONAMIDE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.15 Å R-free 0.286
1M4C Crystal Structure of Human Interleukin-2 Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.40 Å R-free 0.333
1M4C Crystal Structure of Human Interleukin-2 Deposited 2002-07-02	Different mutation/modification Different ligand/ion Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.40 Å R-free 0.333
1NBP Crystal Structure Of Human Interleukin-2 Y31C Covalently Modified At C31 With 3-Mercapto-1-(1,3,4,9-tetrahydro-B-carbolin-2-yl)-propan-1-one Deposited 2002-12-03	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Mutation：Y31C	SO4 SULFATE ION × 1 MHC 3-MERCAPTO-1-(1,3,4,9-TETRAHYDRO-B-CARBOLIN-2-YL)-PROPAN-1-ONE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；ammonium sulfate, PEG 8k, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.20 Å R-free 0.277
1PW6 Low Micromolar Small Molecule Inhibitor of IL-2 Deposited 2003-06-30	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Not recorded	SO4 SULFATE ION × 1 FRB 2-CYCLOHEXYL-N-(2-{4-[5-(2,3-DICHLORO-PHENYL)-2H-PYRAZOL-3-YL]-PIPERIDIN-1-YL}-2-OXO-ETHYL)-2-GUANIDINO-ACETAMIDE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；lithium sulfate, ammonium sulfate, pH 5.9, VAPOR DIFFUSION, HANGING DROP	Resolution 2.60 Å R-free 0.292
1PW6 Low Micromolar Small Molecule Inhibitor of IL-2 Deposited 2003-06-30	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–153（133 aa）	Not recorded	FRB 2-CYCLOHEXYL-N-(2-{4-[5-(2,3-DICHLORO-PHENYL)-2H-PYRAZOL-3-YL]-PIPERIDIN-1-YL}-2-OXO-ETHYL)-2-GUANIDINO-ACETAMIDE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；lithium sulfate, ammonium sulfate, pH 5.9, VAPOR DIFFUSION, HANGING DROP	Resolution 2.60 Å R-free 0.292
1PW6 Low Micromolar Small Molecule Inhibitor of IL-2 Deposited 2003-06-30	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 21–153（133 aa） Chain B 21–153（133 aa）	Not recorded	SO4 SULFATE ION × 2 FRB 2-CYCLOHEXYL-N-(2-{4-[5-(2,3-DICHLORO-PHENYL)-2H-PYRAZOL-3-YL]-PIPERIDIN-1-YL}-2-OXO-ETHYL)-2-GUANIDINO-ACETAMIDE × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；lithium sulfate, ammonium sulfate, pH 5.9, VAPOR DIFFUSION, HANGING DROP	Resolution 2.60 Å R-free 0.292
1PW6 Low Micromolar Small Molecule Inhibitor of IL-2 Deposited 2003-06-30	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 21–153（133 aa） Chain B 21–153（133 aa）	Not recorded	SO4 SULFATE ION × 1 FRB 2-CYCLOHEXYL-N-(2-{4-[5-(2,3-DICHLORO-PHENYL)-2H-PYRAZOL-3-YL]-PIPERIDIN-1-YL}-2-OXO-ETHYL)-2-GUANIDINO-ACETAMIDE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；lithium sulfate, ammonium sulfate, pH 5.9, VAPOR DIFFUSION, HANGING DROP	Resolution 2.60 Å R-free 0.292
1PY2 Structure of a 60 nM Small Molecule Bound to a Hot Spot on IL-2 Deposited 2003-07-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–152（132 aa）	Not recorded	FRH 5-[2,3-DICHLORO-4-(5-{1-[2-(2-GUANIDINO-4-METHYL-PENTANOYLAMINO)-ACETYL]-PIPERIDIN-4-YL}-1-METHYL-1H-PYRAZOL-3-YL)-PHENOXYMETHYL]-FURAN-2-CARBOXYLIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.80 Å R-free 0.320
1PY2 Structure of a 60 nM Small Molecule Bound to a Hot Spot on IL-2 Deposited 2003-07-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–152（132 aa）	Not recorded	FRH 5-[2,3-DICHLORO-4-(5-{1-[2-(2-GUANIDINO-4-METHYL-PENTANOYLAMINO)-ACETYL]-PIPERIDIN-4-YL}-1-METHYL-1H-PYRAZOL-3-YL)-PHENOXYMETHYL]-FURAN-2-CARBOXYLIC ACID × 1 ZN ZINC ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.80 Å R-free 0.320
1PY2 Structure of a 60 nM Small Molecule Bound to a Hot Spot on IL-2 Deposited 2003-07-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain C 21–152（132 aa）	Not recorded	FRH 5-[2,3-DICHLORO-4-(5-{1-[2-(2-GUANIDINO-4-METHYL-PENTANOYLAMINO)-ACETYL]-PIPERIDIN-4-YL}-1-METHYL-1H-PYRAZOL-3-YL)-PHENOXYMETHYL]-FURAN-2-CARBOXYLIC ACID × 1 ZN ZINC ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.80 Å R-free 0.320
1PY2 Structure of a 60 nM Small Molecule Bound to a Hot Spot on IL-2 Deposited 2003-07-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain D 21–152（132 aa）	Not recorded	FRH 5-[2,3-DICHLORO-4-(5-{1-[2-(2-GUANIDINO-4-METHYL-PENTANOYLAMINO)-ACETYL]-PIPERIDIN-4-YL}-1-METHYL-1H-PYRAZOL-3-YL)-PHENOXYMETHYL]-FURAN-2-CARBOXYLIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.80 Å R-free 0.320
1PY2 Structure of a 60 nM Small Molecule Bound to a Hot Spot on IL-2 Deposited 2003-07-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 5 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain C 21–152（132 aa）	Not recorded	FRH 5-[2,3-DICHLORO-4-(5-{1-[2-(2-GUANIDINO-4-METHYL-PENTANOYLAMINO)-ACETYL]-PIPERIDIN-4-YL}-1-METHYL-1H-PYRAZOL-3-YL)-PHENOXYMETHYL]-FURAN-2-CARBOXYLIC ACID × 1 ZN ZINC ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.80 Å R-free 0.320
1PY2 Structure of a 60 nM Small Molecule Bound to a Hot Spot on IL-2 Deposited 2003-07-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 6 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–152（132 aa）	Not recorded	FRH 5-[2,3-DICHLORO-4-(5-{1-[2-(2-GUANIDINO-4-METHYL-PENTANOYLAMINO)-ACETYL]-PIPERIDIN-4-YL}-1-METHYL-1H-PYRAZOL-3-YL)-PHENOXYMETHYL]-FURAN-2-CARBOXYLIC ACID × 1 ZN ZINC ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.80 Å R-free 0.320
1QVN Structure of SP4160 Bound to IL-2 V69A Deposited 2003-08-28	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 21–152（132 aa） Chain C 21–152（132 aa）	Mutation：V69A Mutation：V69A	ZN ZINC ION × 2 FRI 2-GUANIDINO-4-METHYL-PENTANOIC ACID [2-(4-{5-[4-(4-ACETYLAMINO-BENZYLOXY)-2,3-DICHLORO-PHENYL]-2-METHYL-2H-PYRAZOL-3-YL}-PIPERIDIN-1-YL)-2-OXO-ETHYL]-AMIDE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.70 Å R-free 0.308
1QVN Structure of SP4160 Bound to IL-2 V69A Deposited 2003-08-28	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain B 21–152（132 aa） Chain D 21–152（132 aa）	Mutation：V69A Mutation：V69A	ZN ZINC ION × 2 FRI 2-GUANIDINO-4-METHYL-PENTANOIC ACID [2-(4-{5-[4-(4-ACETYLAMINO-BENZYLOXY)-2,3-DICHLORO-PHENYL]-2-METHYL-2H-PYRAZOL-3-YL}-PIPERIDIN-1-YL)-2-OXO-ETHYL]-AMIDE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.70 Å R-free 0.308
1QVN Structure of SP4160 Bound to IL-2 V69A Deposited 2003-08-28	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 21–152（132 aa） Chain B 21–152（132 aa） Chain C 21–152（132 aa） Chain D 21–152（132 aa）	Mutation：V69A Mutation：V69A Mutation：V69A Mutation：V69A	ZN ZINC ION × 4 FRI 2-GUANIDINO-4-METHYL-PENTANOIC ACID [2-(4-{5-[4-(4-ACETYLAMINO-BENZYLOXY)-2,3-DICHLORO-PHENYL]-2-METHYL-2H-PYRAZOL-3-YL}-PIPERIDIN-1-YL)-2-OXO-ETHYL]-AMIDE × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.70 Å R-free 0.308
1QVN Structure of SP4160 Bound to IL-2 V69A Deposited 2003-08-28	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 21–152（132 aa） Chain C 21–152（132 aa）	Mutation：V69A Mutation：V69A	ZN ZINC ION × 2 FRI 2-GUANIDINO-4-METHYL-PENTANOIC ACID [2-(4-{5-[4-(4-ACETYLAMINO-BENZYLOXY)-2,3-DICHLORO-PHENYL]-2-METHYL-2H-PYRAZOL-3-YL}-PIPERIDIN-1-YL)-2-OXO-ETHYL]-AMIDE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；0.05 M Zinc Acetate, 0.075 M Magnesium Chloride, 18% (w/v) Polyethylene Glycol 10K, 0.1M Sodium Cacodylate, pH 5.9. , VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.70 Å R-free 0.308
1Z92 structure of interleukin-2 with its alpha receptor Deposited 2005-03-31	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；293 K；Na-malonic acid, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 2.80 Å R-free 0.280
2B5I cytokine receptor complex Deposited 2005-09-28	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 A 21–153（133 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.1；293 K；29% Pentaerythritol Ethoxylate 15/4; 50 mM Ammonium Sulfate; 50 mM Bis Tris, pH 6.1, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 2.30 Å R-free 0.269
2ERJ Crystal structure of the heterotrimeric interleukin-2 receptor in complex with interleukin-2 Deposited 2005-10-25	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 D 21–153（133 aa）	Mutation：C125A	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.1；295.5 K；MPEG 550, sodium acetate, sodium citrate, phenol, pH 5.1, VAPOR DIFFUSION, SITTING DROP, temperature 295.5K	Resolution 3.00 Å R-free 0.263
2ERJ Crystal structure of the heterotrimeric interleukin-2 receptor in complex with interleukin-2 Deposited 2005-10-25	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric	Chain H 21–153（133 aa）	Mutation：C125A	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.1；295.5 K；MPEG 550, sodium acetate, sodium citrate, phenol, pH 5.1, VAPOR DIFFUSION, SITTING DROP, temperature 295.5K	Resolution 3.00 Å R-free 0.263
3INK UNRAVELING THE STRUCTURE OF INTERLEUKIN-2: REPLY Deposited 1992-12-09	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain C 21–153（133 aa） Chain D 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.50 Å
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	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 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 10 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain b 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 11 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain e 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 12 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain h 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	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 D 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain G 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain J 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 5 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain M 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 6 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain P 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 7 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain S 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 8 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain V 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QAZ IL-2 mutant D10 ternary complex Deposited 2011-01-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 9 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain Y 21–153（133 aa） Fragment：unp residues 21-153	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；298 K；100 mM Bis-Tris, 200 mM NH4SO4, 25% PEG-3350, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.80 Å R-free 0.344
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain C 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain D 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 5 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain E 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 6 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain F 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 7 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain G 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
3QB1 Interleukin-2 mutant D10 Deposited 2011-01-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 8 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain H 21–153（133 aa）	Mutation：Q74H, L80F, R81D, L85V, I86V, I92F	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.2；298 K；50 mM HEPES, 200 mM NaCl, 30% PEG-4000, pH 7.2, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.10 Å R-free 0.263
5LQB Complex structure of human IL2 mutant, Proleukin, with Fab fragment of NARA1 antibody Deposited 2016-08-16	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 22–153（132 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；20% PEG3350 0.2M Sodium Nitrate	Resolution 1.95 Å R-free 0.291
5UTZ Human IL-2/Fab complex Deposited 2017-02-15	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 D 21–153（133 aa）	Not recorded	GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；100 mM sodium citrate, pH 5.0, 20% PEG6000	Resolution 2.75 Å R-free 0.247
5UTZ Human IL-2/Fab complex Deposited 2017-02-15	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 A 21–153（133 aa）	Not recorded	GOL GLYCEROL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；100 mM sodium citrate, pH 5.0, 20% PEG6000	Resolution 2.75 Å R-free 0.247
5UTZ Human IL-2/Fab complex Deposited 2017-02-15	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain E 21–153（133 aa）	Not recorded	GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；100 mM sodium citrate, pH 5.0, 20% PEG6000	Resolution 2.75 Å R-free 0.247
5UTZ Human IL-2/Fab complex Deposited 2017-02-15	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain I 21–153（133 aa）	Not recorded	GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5；295 K；100 mM sodium citrate, pH 5.0, 20% PEG6000	Resolution 2.75 Å R-free 0.247
6LX3 Cryo-EM structure of human secretory immunoglobulin A Deposited 2020-02-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric	Chain A 1–21（21 aa） Chain B 1–21（21 aa） Chain C 1–21（21 aa） Chain D 1–21（21 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.15 Å
6LXW Cryo-EM structure of human secretory immunoglobulin A in complex with the N-terminal domain of SpsA Deposited 2020-02-12	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 7 PDB declaration: heptameric	Chain A 1–21（21 aa） Chain B 1–21（21 aa） Chain C 1–21（21 aa） Chain D 1–21（21 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.27 Å
6VWU X-ray structure of ALKS 4230, a fusion of circularly permuted human Interleukin-2 and Interleukin-2 Receptor alpha Deposited 2020-02-20	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain A 24–94（71 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；An equal volume of protein was mixed with crystallization buffer, 25 % (w/v) PEG 3350, 0.2 M MgCl2, 0.1 M Hepes 7.5. Large crystals appeared within 48-72 hours, and were frozen in a cryoprotectant consisting of mother liquor with 10 % glycerol	Resolution 3.40 Å R-free 0.297
6YE3 IL-2 in complex with a Fab fragment from UFKA-20 Deposited 2020-03-23	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain C 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；10.86% (v/v) PEG 8000, 5.76% (v/v) ethylene glycol, 100 mM HEPES, pH 7.48	Resolution 2.89 Å R-free 0.283
6YE3 IL-2 in complex with a Fab fragment from UFKA-20 Deposited 2020-03-23	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain F 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；10.86% (v/v) PEG 8000, 5.76% (v/v) ethylene glycol, 100 mM HEPES, pH 7.48	Resolution 2.89 Å R-free 0.283
6YE3 IL-2 in complex with a Fab fragment from UFKA-20 Deposited 2020-03-23	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain I 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；10.86% (v/v) PEG 8000, 5.76% (v/v) ethylene glycol, 100 mM HEPES, pH 7.48	Resolution 2.89 Å R-free 0.283
7DR4 Complex of anti-human IL-2 antibody and human IL-2 Deposited 2020-12-25	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 K 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2M NH4NO3, pH4.8, 25% PEG3350	Resolution 2.49 Å R-free 0.258
7DR4 Complex of anti-human IL-2 antibody and human IL-2 Deposited 2020-12-25	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 J 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2M NH4NO3, pH4.8, 25% PEG3350	Resolution 2.49 Å R-free 0.258
7DR4 Complex of anti-human IL-2 antibody and human IL-2 Deposited 2020-12-25	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain G 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2M NH4NO3, pH4.8, 25% PEG3350	Resolution 2.49 Å R-free 0.258
7DR4 Complex of anti-human IL-2 antibody and human IL-2 Deposited 2020-12-25	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain I 21–153（133 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2M NH4NO3, pH4.8, 25% PEG3350	Resolution 2.49 Å R-free 0.258
7M2G INTERLEUKIN-2 (human) mutant P65K, C125S Deposited 2021-03-16	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa） Fragment：IL2	Mutation：P65K, C125S	SO4 SULFATE ION × 1 GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions EVAPORATION；pH 7.75；293 K；1.75M (NH4)2SO4, 0.10 M HEPES/NaOH pH=7.75 at a protein concentration of 37 mg/ml.	Resolution 1.79 Å R-free 0.228
7RA9 Designed StabIL-2 seq1 Deposited 2021-06-30	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Mutation：G27M, I28L, K32D, M39L, E52S, V69A, L72A, Q74G, S75D, K76D, N77P, F78K, H79T, L80I, delta81-82, L85V, I86V, I92F, V115I	PO4 PHOSPHATE ION × 3 EPE 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 10.5；295 K；0.2 M Li2SO4, 0.1 M CAPS pH 10.5, 1.2 M NaH2PO4, and 0.8 M K2HPO4	Resolution 2.20 Å R-free 0.293
7RAA Designed StabIL-2 seq15 Deposited 2021-06-30	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 21–153（133 aa）	Mutation：G27M, I28L, K32D, V69A, L72Q, R81D, V115I	MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.3；295 K；0.2 M MgCl2, 0.1 M Tris pH 8.3, 24% PEG 3350 with microseeding	Resolution 2.69 Å R-free 0.294
7RAA Designed StabIL-2 seq15 Deposited 2021-06-30	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 21–153（133 aa）	Mutation：G27M, I28L, K32D, V69A, L72Q, R81D, V115I	MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.3；295 K；0.2 M MgCl2, 0.1 M Tris pH 8.3, 24% PEG 3350 with microseeding	Resolution 2.69 Å R-free 0.294
7RAA Designed StabIL-2 seq15 Deposited 2021-06-30	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain C 21–153（133 aa）	Mutation：G27M, I28L, K32D, V69A, L72Q, R81D, V115I	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.3；295 K；0.2 M MgCl2, 0.1 M Tris pH 8.3, 24% PEG 3350 with microseeding	Resolution 2.69 Å R-free 0.294
7RAA Designed StabIL-2 seq15 Deposited 2021-06-30	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain D 21–153（133 aa）	Mutation：G27M, I28L, K32D, V69A, L72Q, R81D, V115I	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.3；295 K；0.2 M MgCl2, 0.1 M Tris pH 8.3, 24% PEG 3350 with microseeding	Resolution 2.69 Å R-free 0.294
7ZMZ Engineered Interleukin 2 bound to CD25 receptor Deposited 2022-04-20	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 20–153（134 aa）	Mutation：T37H, R38L, T41S, F42Y, K43G	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；291 K；19% PEG 3350, 0.2 M Sodium tartrate dibasic dihydrate, 10% glycerol	Resolution 3.20 Å R-free 0.258
8SOW Structure of the complex formed by human interleukin-2 and scFv F10 Deposited 2023-04-30	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 20–153（134 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；293 K；15-30% PEG 3350, 0.1-0.35 M ammonium fluoride	Resolution 1.71 Å R-free 0.235
8SOZ Structure of the complex formed by human interleukin-2 and scFv 602 Deposited 2023-04-30	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 20–153（134 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；293 K；15-30% PEG 3350, 0.1-0.35 ammonium fluoride	Resolution 1.64 Å R-free 0.250
8WYR Cryo-EM structure of human CD5L bound to IgM-Fc/J Deposited 2023-10-31	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 12 PDB declaration: dodecameric	Chain A 1–21（21 aa） Chain B 1–21（21 aa） Chain C 1–21（21 aa） Chain D 1–21（21 aa） Chain E 1–21（21 aa） Chain F 1–21（21 aa） Chain G 1–21（21 aa） Chain H 1–21（21 aa） Chain K 1–21（21 aa） Chain L 1–21（21 aa） Chain M 1–21（21 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 CA CALCIUM ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.39 Å
8WYS Local map of human CD5L bound to IgM-Fc/J Deposited 2023-10-31	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 1–21（21 aa） Chain L 1–21（21 aa） Chain M 1–21（21 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.41 Å
9KMC Cryo-EM structure of the heterotrimeric interleukin-2 receptor in complex with interleukin-2 and anti-CD25 Fab S417 Deposited 2024-11-15	Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric	Chain D 21–153（133 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.97 Å
9MBZ Cryo-EM structure of human FcRL4 bound to IgA-Fc/J Deposited 2025-03-17	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric	Chain A 1–21（21 aa） Chain B 1–21（21 aa） Chain C 1–21（21 aa） Chain D 1–21（21 aa） Chain F 1–21（21 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 3.30 Å

33 other PDB entries and 77 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IL2_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–133； UniProt 21–153

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	1m4a
Deposition date deposition_date	2002-07-02
Structure title title	Crystal Structure of Human Interleukin-2 Y31C Covalently Modified at C31 with (1H-Indol-3-yl)-(2-mercapto-ethoxyimino)-acetic acid
Keywords keywords	cytokine, four-helix bundle, small molecule complex; CYTOKINE
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	15.56 Å
Radius of gyration Rg (electron density) rg_electron	14.24 Å
Forward intensity I(0) i0	3426540.00
Molecular weight molecular_weight	13721.0 kDa
Excluded volume excluded_volume	17553 Å³
Envelope volume envelope_volume	19680 Å³
Hydration-shell volume shell_volume	11942 Å³
Envelope diameter envelope_diameter	53.8 Å
Shell Rg shell_rg	19.80 Å
Envelope Rg envelope_rg	14.72 Å
Shape Rg shape_rg	14.19 Å
Total Rg total_rg	15.61 Å
Total atoms total_atoms	959
Residues n_residues	114
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	51.7 Å
Rg (real space) rg_real	15.49 Å
Rg uncertainty (real space) rg_real_error	0.35 Å
I(0) (real space) i0_real	3.4270e+06
I(0) uncertainty (real space) i0_real_error	4.3540e+04
Rg (reciprocal space) rg_reciprocal	15.50 Å
I(0) (reciprocal space) i0_reciprocal	3427000.0000
Solution quality estimate total_estimate	0.7955
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	3
Primary peak position r_peak_primary	19.6 Å
Skewness Skewness skewness	0.205
Kurtosis Kurtosis kurtosis	-0.247
Angular range angular_range	— – 0.5000 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	524800.0000
Real-space data points n_real_points	80
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.781; Stabil: 0.998; Sysdev: 1.000; Positv: 1.000; Valcen: 1.000; 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	interleukin-2
Molecular weight formula_weight	15375.9 kDa
Mutation mutation	Y31C
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	972

APTSSSTKKTQLQLEHLLLDLQMILNGINNCKNPKLTRMLTFKFYMPKKATELKHLQCLEEELKPLEEVLNLAQSKNFHLRPRDLISNINVIVLELKGSETTFMCEYADETATIVEFLNRWITFCQSIISTLT

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	human
NCBI Class编号 ncbi_taxonomy_id	9606
宿主生物 host_organism	Escherichia coli BL21

Entity 2 Entity 2 non-polymer

Description description	(1H-INDOL-3-YL)-(2-MERCAPTO-ETHOXYIMINO)-ACETIC ACID
Molecular weight formula_weight	266.3 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 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	13

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7. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d1m4aa_
Class class	a — All alpha proteins
Fold Fold fold	a.26 — 4-helical cytokines
Superfamily Superfamily superfamily	a.26.1 — 4-helical cytokines
Family Family family	a.26.1.2 — Short-chain cytokines

CATH v4.4 (1 domains)

Domain ID domain_id	1m4aA00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1250 — Growth Hormone; Chain: A;
Homologous superfamily homologous superfamily	10 —

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8. Citations (1)

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Unit-cell length a length_a	31.150 Å
Unit-cell length b length_b	47.590 Å
Unit-cell length c length_c	42.630 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	104.84 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	2

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	2.180 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.2762
R_work r_work	0.2712
R_free r_free	0.3236

fit	/app/data/saxs_computation/m4/1m4a/1m4a.fit
pddf	/app/data/pr_computation/m4/1m4a/1m4a.pr.out
profile	/app/data/saxs_computation/m4/1m4a/1m4a.dat