SAXSdb — 7oly

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

Inhibin beta A chain

Homo sapiens

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 10 其他Polymer 2 PDB declaration: decameric（10） Consistent with protein copy count	Chain A； UniProt 311–426	Not recorded	Activin receptor type-2B × 2 （Q13705） Fab heavy chain × 2 Activin receptor type-1B × 2 （P36896） Fab light chain × 2 ;2-acetamido-2-deoxy-beta-D-glucopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；17.7 mg/ml complex in 20 mM HEPES, 200 mM NaCl pH 7.5. 100 + 100 nl sitting drop in a MRC 3-well plate with reservoir 0.1 M Na cacodylate pH 6.5 and 17 % (w/v) PEG 4000).	Resolution 3.27 Å R-free 0.269

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 7OLY	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1NYS Crystal Structure of Activin A Bound to the ECD of ActRIIB P41 Deposited 2003-02-13	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain B 311–426（116 aa） Fragment：Mature Domain (residues 311-426) Chain D 311–426（116 aa） Fragment：Mature Domain (residues 311-426)	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；295 K；PEG 4000, sodium chloride, hepes, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 295K	Resolution 3.05 Å R-free 0.299
1NYU Crystal Structure of Activin A Bound to the ECD of ActRIIB Deposited 2003-02-13	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain B 311–426（116 aa） Fragment：Mature Domain (residues 311-426) Chain D 311–426（116 aa） Fragment：Mature Domain (residues 311-426)	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；295 K；PEG 4000, sodium chloride, hepes, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 295K	Resolution 3.10 Å R-free 0.291
1S4Y Crystal structure of the activin/actrIIb extracellular domain Deposited 2004-01-19	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain B 311–426（116 aa） Chain D 311–426（116 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；277 K；PEG 3350, magnesium chloride, bis tris, pH 6.7, VAPOR DIFFUSION, HANGING DROP, temperature 277K	Resolution 2.30 Å R-free 0.286
2ARP Activin A in complex with Fs12 fragment of follistatin Deposited 2005-08-21	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 311–426（116 aa）	Not recorded	NI NICKEL (II) ION × 6 1PG 2-(2-{2-[2-(2-METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHANOL × 2 GOL GLYCEROL × 8	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；293 K；PEG-MME 2000, Nickel chloride, Tris-HCl, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 2.00 Å R-free 0.254
2ARV Structure of human Activin A Deposited 2005-08-22	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 311–426（116 aa） Chain B 311–426（116 aa）	Not recorded	SO4 SULFATE ION × 4 GOL GLYCEROL × 3 1PG 2-(2-{2-[2-(2-METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHANOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.8；298 K；Ammonium sulphate, PEG300, Na-Hepes, pH 7.8, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.259
2B0U The Structure of the Follistatin:Activin Complex Deposited 2005-09-14	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 311–426（116 aa） Fragment：Activin (mature form) Chain B 311–426（116 aa） Fragment：Activin (mature form)	Not recorded	IR3 IRIDIUM (III) ION × 5 MLI MALONATE ION × 4 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；295 K；PEG 3350, 200 mM Malonate, pH 7.0, vapor diffusion, hanging drop, temperature 295K	Resolution 2.80 Å R-free 0.297
2P6A The structure of the Activin:Follistatin 315 complex Deposited 2007-03-16	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric	Chain A 311–426（116 aa） Chain B 311–426（116 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；298 K；20-23% PEG 1000, 200mM MgCl2, 3% EtOH, 20mM Trimethyl-amine HCl, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298 K	Resolution 3.40 Å R-free 0.324
3B4V X-Ray structure of Activin in complex with FSTL3 Deposited 2007-10-24	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 311–426（116 aa） Chain B 311–426（116 aa）	Not recorded	EDO 1,2-ETHANEDIOL × 2 SO4 SULFATE ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 3350, ammonium sulfate, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.48 Å R-free 0.279
3B4V X-Ray structure of Activin in complex with FSTL3 Deposited 2007-10-24	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain E 311–426（116 aa） Chain F 311–426（116 aa）	Not recorded	EDO 1,2-ETHANEDIOL × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 3350, ammonium sulfate, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.48 Å R-free 0.279
5HLY Structure of Pro-Activin A Precursor at 2.3 A Resolution Deposited 2016-01-15	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 30–426（397 aa）	Mutation：C35S, C38S, deletion:K259-D282 Non-standard monomer：Yes (specific site not provided by mmCIF)	CL CHLORIDE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；292 K；25% w/v polyethylene glycol 1000, 100 mM MES pH 6.5; cryo: 15% v/v PEG 400 added	Resolution 2.30 Å R-free 0.252
5HLZ Structure of Pro-Activin A Complex at 2.85 A resolution Deposited 2016-01-15	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 30–305（276 aa） Fragment：Pro domain, UNP Residues 30-305 Chain B 311–426（116 aa） Fragment：Mature domain, UNP Residues 311-426 Chain C 30–305（276 aa） Fragment：Pro domain, UNP Residues 30-305 Chain D 311–426（116 aa） Fragment：Mature domain, UNP Residues 311-426	Mutation：;C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP) ; Mutation：;C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP) ;	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；292 K；20% w/v polyethylene glycol 3350, 0.2 M calcium chloride; cryo: 15% v/v PEG 400 added	Resolution 2.85 Å R-free 0.274
5HLZ Structure of Pro-Activin A Complex at 2.85 A resolution Deposited 2016-01-15	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain E 30–305（276 aa） Fragment：Pro domain, UNP Residues 30-305 Chain F 311–426（116 aa） Fragment：Mature domain, UNP Residues 311-426 Chain G 30–305（276 aa） Fragment：Pro domain, UNP Residues 30-305 Chain H 311–426（116 aa） Fragment：Mature domain, UNP Residues 311-426	Mutation：;C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP) ; Mutation：;C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site (RRRRR) replaced by HRV 3C protease cleavage site (LEVLFQGP),C35S, C38S, deletion of K259-D282, furin cleavage site replaced by HRV 3C protease cleavage site (LEVLFQGP) ;	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；292 K；20% w/v polyethylene glycol 3350, 0.2 M calcium chloride; cryo: 15% v/v PEG 400 added	Resolution 2.85 Å R-free 0.274
6Y6N Structure of mature activin A with small molecule 2 Deposited 2020-02-26	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 311–426（116 aa） Chain B 311–426（116 aa）	Not recorded	ODQ (3~{R})-3,4-dimethyl-3-propyl-1~{H}-1,4-benzodiazepine-2,5-dione × 1 SO4 SULFATE ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；1.65 M (NH4)2SO4, 4 % PEG 300, 100 mM Hepes pH 7.4, 2 % DMSO	Resolution 2.03 Å R-free 0.251
6Y6O Structure of mature activin A with small molecule 42 Deposited 2020-02-26	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 311–426（116 aa） Chain B 311–426（116 aa）	Not recorded	SO4 SULFATE ION × 10 OCK (3~{R})-4-ethyl-3-methyl-3-propyl-1~{H}-1,4-benzodiazepine-2,5-dione × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；1.65 M (NH4)2SO4, 4 % PEG 300, 100 mM Hepes pH 7.4, 2 % DMSO	Resolution 2.04 Å R-free 0.254
7U5P CRYSTAL STRUCTURE OF THE ACTIVIN RECEPTOR TYPE-2A LIGAND BINDING DOMAIN IN COMPLEX WITH ACTIVIN-A Deposited 2022-03-02	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 311–426（116 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.8；294 K；100mM Sodium Citrate, 17%PEG 3000	Resolution 3.14 Å R-free 0.276
7U5P CRYSTAL STRUCTURE OF THE ACTIVIN RECEPTOR TYPE-2A LIGAND BINDING DOMAIN IN COMPLEX WITH ACTIVIN-A Deposited 2022-03-02	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain D 311–426（116 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.8；294 K；100mM Sodium Citrate, 17%PEG 3000	Resolution 3.14 Å R-free 0.276
7U5P CRYSTAL STRUCTURE OF THE ACTIVIN RECEPTOR TYPE-2A LIGAND BINDING DOMAIN IN COMPLEX WITH ACTIVIN-A Deposited 2022-03-02	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain F 311–426（116 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.8；294 K；100mM Sodium Citrate, 17%PEG 3000	Resolution 3.14 Å R-free 0.276
7U5P CRYSTAL STRUCTURE OF THE ACTIVIN RECEPTOR TYPE-2A LIGAND BINDING DOMAIN IN COMPLEX WITH ACTIVIN-A Deposited 2022-03-02	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain H 311–426（116 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.8；294 K；100mM Sodium Citrate, 17%PEG 3000	Resolution 3.14 Å R-free 0.276
9I5W Structure of mature Activin A from DMSO solvent optimisation of XChem fragment screen Deposited 2025-01-28	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 311–426（116 aa） Chain B 311–426（116 aa）	Not recorded	DMS DIMETHYL SULFOXIDE × 6 SO4 SULFATE ION × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.4；294 K；1.55 M (NH4)2SO4, 100 mM Hepes pH 7.4, 8 % DMSO, 40 mM NaSO4	Resolution 1.77 Å R-free 0.235

14 other PDB entries and 19 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	INHBA_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–116； UniProt 311–426

Activin receptor type-2B

Homo sapiens

UniProt Q13705

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 10 其他Polymer 2 PDB declaration: decameric（10） Consistent with protein copy count	Chain C； UniProt 19–134	Not recorded	Inhibin beta A chain × 2 （P08476） Fab heavy chain × 2 Activin receptor type-1B × 2 （P36896） Fab light chain × 2 ;2-acetamido-2-deoxy-beta-D-glucopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；17.7 mg/ml complex in 20 mM HEPES, 200 mM NaCl pH 7.5. 100 + 100 nl sitting drop in a MRC 3-well plate with reservoir 0.1 M Na cacodylate pH 6.5 and 17 % (w/v) PEG 4000).	Resolution 3.27 Å R-free 0.269

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 7OLY	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
2QLU Crystal structure of Activin receptor type II kinase domain from human Deposited 2007-07-13	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 190–487（298 aa） Fragment：Protein kinase domain	Not recorded	SO4 SULFATE ION × 2 ADE ADENINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；295 K；45mM MES, 90mM ammonium sulfate, 11% polyethylene glycol monomethyl ether 5000, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 295K	Resolution 2.00 Å R-free 0.283
4FAO Specificity and Structure of a high affinity Activin-like 1 (ALK1) signaling complex Deposited 2012-05-22	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric	Chain E 19–134（116 aa） Fragment：Extracellular domain Chain F 19–134（116 aa） Fragment：Extracellular domain	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 NA SODIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；20% PEG 3350, 0.2 M sodium malonate, 0.1 M Bis-Tris propane, pH 6.5, vapor diffusion, temperature 293K	Resolution 3.36 Å R-free 0.261
4FAO Specificity and Structure of a high affinity Activin-like 1 (ALK1) signaling complex Deposited 2012-05-22	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric	Chain K 19–134（116 aa） Fragment：Extracellular domain Chain L 19–134（116 aa） Fragment：Extracellular domain	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 NA SODIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；20% PEG 3350, 0.2 M sodium malonate, 0.1 M Bis-Tris propane, pH 6.5, vapor diffusion, temperature 293K	Resolution 3.36 Å R-free 0.261
4FAO Specificity and Structure of a high affinity Activin-like 1 (ALK1) signaling complex Deposited 2012-05-22	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric	Chain Q 19–134（116 aa） Fragment：Extracellular domain Chain R 19–134（116 aa） Fragment：Extracellular domain	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 NA SODIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；20% PEG 3350, 0.2 M sodium malonate, 0.1 M Bis-Tris propane, pH 6.5, vapor diffusion, temperature 293K	Resolution 3.36 Å R-free 0.261
4FAO Specificity and Structure of a high affinity Activin-like 1 (ALK1) signaling complex Deposited 2012-05-22	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric	Chain W 19–134（116 aa） Fragment：Extracellular domain Chain X 19–134（116 aa） Fragment：Extracellular domain	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 NA SODIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；20% PEG 3350, 0.2 M sodium malonate, 0.1 M Bis-Tris propane, pH 6.5, vapor diffusion, temperature 293K	Resolution 3.36 Å R-free 0.261
4FAO Specificity and Structure of a high affinity Activin-like 1 (ALK1) signaling complex Deposited 2012-05-22	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 5 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric	Chain e 19–134（116 aa） Fragment：Extracellular domain Chain f 19–134（116 aa） Fragment：Extracellular domain	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 NA SODIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；20% PEG 3350, 0.2 M sodium malonate, 0.1 M Bis-Tris propane, pH 6.5, vapor diffusion, temperature 293K	Resolution 3.36 Å R-free 0.261
4FAO Specificity and Structure of a high affinity Activin-like 1 (ALK1) signaling complex Deposited 2012-05-22	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 6 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric	Chain k 19–134（116 aa） Fragment：Extracellular domain Chain l 19–134（116 aa） Fragment：Extracellular domain	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 NA SODIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；20% PEG 3350, 0.2 M sodium malonate, 0.1 M Bis-Tris propane, pH 6.5, vapor diffusion, temperature 293K	Resolution 3.36 Å R-free 0.261
5NGV CRYSTAL STRUCTURE OF THE Activin receptor type-2B LIGAND BINDING DOMAIN IN COMPLEX WITH BIMAGRUMAB FV, ORTHORHOMBIC CRYSTAL FORM Deposited 2017-03-20	Different construct 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 24–117（94 aa） Fragment：LIGAND BINDING domain	Not recorded	PG4 TETRAETHYLENE GLYCOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5.4；293 K；0.1M PHOSPHATE-CITRATE, 40% PEG 300	Resolution 2.00 Å R-free 0.198
5NHR CRYSTAL STRUCTURE OF THE Activin receptor type-2B LIGAND BINDING DOMAIN IN COMPLEX WITH BIMAGRUMAB FV, CUBIC CRYSTAL FORM Deposited 2017-03-22	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain C 24–117（94 aa） Fragment：VL, UNP residues 24-117	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 4.6；293 K；1.4M AMMONIUM SULFATE, 0.1M SODIUM CITRATE	Resolution 3.35 Å R-free 0.229
5NHR CRYSTAL STRUCTURE OF THE Activin receptor type-2B LIGAND BINDING DOMAIN IN COMPLEX WITH BIMAGRUMAB FV, CUBIC CRYSTAL FORM Deposited 2017-03-22	Different construct 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 24–117（94 aa） Fragment：VL, UNP residues 24-117	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 4.6；293 K；1.4M AMMONIUM SULFATE, 0.1M SODIUM CITRATE	Resolution 3.35 Å R-free 0.229
7MRZ Structure of GDF11 bound to fused ActRIIB-ECD and Alk4-ECD with Anti-ActRIIB Fab fragment Deposited 2021-05-10	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 8 PDB declaration: octameric	Chain C 19–134（116 aa） Fragment：Extracellular domains of both proteins in the fused construct	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；0.1M HEPES, 0.9M ammonium sulfate, 0.9 M KCl	Resolution 3.00 Å R-free 0.327
9D20 Crystal structure of DLK1 in complex with ACVR2B Deposited 2024-08-08	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 25–118（94 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 EDO 1,2-ETHANEDIOL × 3 SO4 SULFATE ION × 3 FUC alpha-L-fucopyranose × 1 BGC beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.6；293 K；2.1 M (NH4)2SO4, 0.1 M HEPES PH 7.6 and 2.5% polyethylene glycol (PEG) 400	Resolution 2.67 Å R-free 0.242
9D20 Crystal structure of DLK1 in complex with ACVR2B Deposited 2024-08-08	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 25–118（94 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 EDO 1,2-ETHANEDIOL × 1 SO4 SULFATE ION × 2 FUC alpha-L-fucopyranose × 1 BGC beta-D-glucopyranose × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.6；293 K；2.1 M (NH4)2SO4, 0.1 M HEPES PH 7.6 and 2.5% polyethylene glycol (PEG) 400	Resolution 2.67 Å R-free 0.242
9N4K CryoEM structure of ALK2-ActRIIB bound to BMP6 Deposited 2025-02-03	Different construct 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 A 19–134（116 aa） Chain F 19–134（116 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 BMA beta-D-mannopyranose × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5；50mM Tris-HCL, 100mM NaCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.20 Å

7 other PDB entries and 14 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	AVR2B_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain C； PDBConstruct 1–116； UniProt 19–134

Activin receptor type-1B

Homo sapiens

UniProt P36896

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 10 其他Polymer 2 PDB declaration: decameric（10） Consistent with protein copy count	Chain K； UniProt 24–126	Not recorded	Inhibin beta A chain × 2 （P08476） Activin receptor type-2B × 2 （Q13705） Fab heavy chain × 2 Fab light chain × 2 ;2-acetamido-2-deoxy-beta-D-glucopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2	X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；17.7 mg/ml complex in 20 mM HEPES, 200 mM NaCl pH 7.5. 100 + 100 nl sitting drop in a MRC 3-well plate with reservoir 0.1 M Na cacodylate pH 6.5 and 17 % (w/v) PEG 4000).	Resolution 3.27 Å R-free 0.269

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 7OLY	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
7MRZ Structure of GDF11 bound to fused ActRIIB-ECD and Alk4-ECD with Anti-ActRIIB Fab fragment Deposited 2021-05-10	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 8 PDB declaration: octameric	Chain C 24–126（103 aa） Fragment：Extracellular domains of both proteins in the fused construct	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；0.1M HEPES, 0.9M ammonium sulfate, 0.9 M KCl	Resolution 3.00 Å R-free 0.327

1 other PDB entries and 1 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	ACV1B_HUMAN
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain K； PDBConstruct 1–103； UniProt 24–126

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.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	7oly
Deposition date deposition_date	2021-05-20
Structure title title	Structure of activin A in complex with an ActRIIB-Alk4 fusion reveal insight into activin receptor interactions
Keywords keywords	GROWTH FACTOR, RECEPTOR, TGFB, SIGNALING, SIGNALING PROTEIN; SIGNALING PROTEIN
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	37.26 Å
Radius of gyration Rg (electron density) rg_electron	37.68 Å
Forward intensity I(0) i0	110555000.00
Molecular weight molecular_weight	81421.0 kDa
Excluded volume excluded_volume	100620 Å³
Envelope volume envelope_volume	141680 Å³
Hydration-shell volume shell_volume	34881 Å³
Envelope diameter envelope_diameter	139.6 Å
Shell Rg shell_rg	38.44 Å
Envelope Rg envelope_rg	38.30 Å
Shape Rg shape_rg	37.62 Å
Total Rg total_rg	37.92 Å
Total atoms total_atoms	5703
Residues n_residues	729
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	134.2 Å
Rg (real space) rg_real	37.87 Å
Rg uncertainty (real space) rg_real_error	1.53 Å
I(0) (real space) i0_real	1.1060e+08
I(0) uncertainty (real space) i0_real_error	1.8030e+06
Rg (reciprocal space) rg_reciprocal	37.49 Å
I(0) (reciprocal space) i0_reciprocal	110500000.0000
Solution quality estimate total_estimate	0.7909
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	1
Primary peak position r_peak_primary	35.1 Å
Skewness Skewness skewness	0.667
Kurtosis Kurtosis kurtosis	-0.112
Angular range angular_range	— – 0.2100 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	7757000.0000
Real-space data points n_real_points	43
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.624; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.695; Smooth: 0.710

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (8)

Entity 1 Entity 1 polymer

Description description	Inhibin beta A chain
Molecular weight formula_weight	12991.9 kDa
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	5718

GLECDGKVNICCKKQFFVSFKDIGWNDWIIAPSGYHANYCEGECPSHIAGTSGSSLSFHSTVINHYRMRGHSPFANLKSCCVPTKLRPMSMLYYDDGQNIIKKDIQNMIVEECGCS

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	Homo sapiens

Entity 2 Entity 2 polymer

Description description	Activin receptor type-2B
Molecular weight formula_weight	14933.4 kDa
EC 编号 ec_number	2.7.11.30
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

SGRGEAETRECIYYNANWELERTNQSGLERCEGEQDKRLHCYASWRNSSGTIELVKKGCWLDDFNCYDRQECVATEENPQVYFCCCEGNFCNERFTHLPEAGGPEVTYEPPPTAPTGGGTHTCPPCPAPELLG

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	Homo sapiens

Entity 3 Entity 3 polymer

Description description	Fab heavy chain
Molecular weight formula_weight	23772.6 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	H

QLQLQESGPGLVKPSETLSLTCTVSGGSISSSSYYWGWIRQPPGKGLEWIGSISYSGSTYYNPSLKSRVTISVDTSKNQFSLKLSSVTAADTAVYYCARDSLRYGMDVWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKRVEPKSCDKT

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	Homo sapiens

Entity 4 Entity 4 polymer

Description description	Activin receptor type-1B
Molecular weight formula_weight	13123.0 kDa
EC 编号 ec_number	2.7.11.30
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	K

SGPRGVQALLCACTSCLQANYTCETDGACMVSIFNLDGMEHHVRTCIPKVELVPAGKPFYCLSSEDLRNTHCCYTDYCNRIDLRVPSGHLKEPEHPSMWGPVETGGGTHTCPPCPAPELLG

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	Homo sapiens

Entity 5 Entity 5 polymer

Description description	Fab light chain
Molecular weight formula_weight	24203.9 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L

DIVMTQSPDSLAVSLGERATINCKSSQSVLYSSNNKNYLAWYQQKPGQPPKLLIYWASTRESGVPDRFSGSGSGTDFTLTISSLQAEDVAVYYCQQYALAPPRTFGGGTKVEIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC

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	Homo sapiens

Entity 6 Entity 6 branched

Description description	;2-acetamido-2-deoxy-beta-D-glucopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ;
Molecular weight formula_weight	1114.0 kDa
Source method src_method	man
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	221.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 8 Entity 8 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	15

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7. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	7olyH01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	7olyH02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	7olyL01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	7olyL02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

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8. Citations (1)

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Unit-cell length a length_a	68.375 Å
Unit-cell length b length_b	68.375 Å
Unit-cell length c length_c	975.538 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 61 2 2
Space-group number int_tables_number	178
Crystal system crystal_system	—

Resolution resolution	3.265 Å
Low-resolution limit resolution_low	49.250 Å
R factor r_factor	0.2362
R_work r_work	0.2344
R_free r_free	0.2685

fit	/app/data/saxs_computation/ol/7oly/7oly.fit
pddf	/app/data/pr_computation/ol/7oly/7oly.pr.out
profile	/app/data/saxs_computation/ol/7oly/7oly.dat

Structure of activin A in complex with an ActRIIB-Alk4 fusion reveal insight into activin receptor interactions

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

Inhibin beta A chain

State in the Current Structure

Other States of the Same Protein in the Database

Activin receptor type-2B

State in the Current Structure

Other States of the Same Protein in the Database

Activin receptor type-1B

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 (8)

Entity 1 Entity 1 polymer

Polymer Polymer

来源 Source

Entity 2 Entity 2 polymer

Polymer Polymer

来源 Source

Entity 3 Entity 3 polymer

Polymer Polymer

来源 Source

Entity 4 Entity 4 polymer

Polymer Polymer

来源 Source

Entity 5 Entity 5 polymer

Polymer Polymer

来源 Source

Entity 6 Entity 6 branched

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 water

7. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

8. Citations (1)

9. Files and Curves (10)

Files (7)

Curves (3)