Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A2B1C1 Pseudo Symmetry: Cyclic - C2  (3D View)
Pseudo Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 50.67 kDa 
• Atom Count: 2375 
• Residue Count: 320 
• Unique protein chains: 2

1NYU

Crystal Structure of Activin A Bound to the ECD of ActRIIB

• DOI: 10.2210/pdb1NYU/pdb

• Classification: MEMBRANE PROTEIN/HORMONE/GROWTH FACTOR
• Organism(s): Rattus norvegicus, Homo sapiens
• Expression System: Spodoptera frugiperda, Cricetulus griseus
• Mutation(s): No 


• Deposited: 2003-02-13 Released: 2003-04-08 
• Deposition Author(s): Thompson, T.B., Woodruff, T.K., Jardetzky, T.S.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Free: 0.291 
• R-Value Work: 0.268 
• R-Value Observed: 0.268 

Literature

Structures of an ActRIIB:activin A complex reveal a novel binding mode for TGF-beta ligand:receptor interactions

Thompson, T.B., Woodruff, T.K., Jardetzky, T.S.

(2003) EMBO J 22: 1555-1566

• PubMed: 12660162 
• DOI: 10.1093/emboj/cdg156
• Primary Citation of Related Structures:  
  1NYS, 1NYU


• PubMed Abstract: 
  

The TGF-beta superfamily of ligands and receptors stimulate cellular events in diverse processes ranging from cell fate specification in development to immune suppression. Activins define a major subgroup of TGF-beta ligands that regulate cellular differentiation, proliferation, activation and apoptosis. Activins signal through complexes formed with type I and type II serine/threonine kinase receptors. We have solved the crystal structure of activin A bound to the extracellular domain of a type II receptor, ActRIIB, revealing the details of this interaction. ActRIIB binds to the outer edges of the activin finger regions, with the two receptors juxtaposed in close proximity, in a mode that differs from TGF-beta3 binding to type II receptors. The dimeric activin A structure differs from other known TGF-beta ligand structures, adopting a compact folded-back conformation. The crystal structure of the complex is consistent with recruitment of two type I receptors into a close packed arrangement at the cell surface and suggests that diversity in the conformational arrangements of TGF-beta ligand dimers could influence cellular signaling processes.

---

Organizational Affiliation: 

Department of Biochemistry, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
activin receptor	A, C	105	Rattus norvegicus	Mutation(s): 0  Gene Names: Actriib, Acvr2b EC: 2.7.11.30
Find proteins for P38445 (Rattus norvegicus) Explore P38445  Go to UniProtKB:  P38445

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Inhibin beta A chain	B, D	116	Homo sapiens	Mutation(s): 0  Gene Names: INHBA
Find proteins for P08476 (Homo sapiens) Explore P08476  Go to UniProtKB:  P08476
NIH Common Fund Data Resources
PHAROS  P08476 GTEx  ENSG00000122641

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Free: 0.291 
• R-Value Work: 0.268 
• R-Value Observed: 0.268 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 141.33	α = 90
b = 141.33	β = 90
c = 46.021	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
MAR345	data collection
SCALEPACK	data scaling
BRUTE	phasing
BEAST	phasing
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-02-13 
• Released Date: 2003-04-08 
Deposition Author(s): Thompson, T.B., Woodruff, T.K., Jardetzky, T.S.

Revision History 

• Version 1.0: 2003-04-08
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2012-05-30
  Changes: Database references
• Version 1.4: 2017-10-11
  Changes: Refinement description