2B0U

The Structure of the Follistatin:Activin Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.265 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

The Structure of the Follistatin:Activin Complex Reveals Antagonism of Both Type I and Type II Receptor Binding.

Thompson, T.B.Lerch, T.F.Cook, R.W.Woodruff, T.K.Jardetzky, T.S.

(2005) Dev.Cell 9: 535-543

  • DOI: 10.1016/j.devcel.2005.09.008

  • PubMed Abstract: 
  • TGF-beta ligands stimulate diverse cellular differentiation and growth responses by signaling through type I and II receptors. Ligand antagonists, such as follistatin, block signaling and are essential regulators of physiological responses. Here we r ...

    TGF-beta ligands stimulate diverse cellular differentiation and growth responses by signaling through type I and II receptors. Ligand antagonists, such as follistatin, block signaling and are essential regulators of physiological responses. Here we report the structure of activin A, a TGF-beta ligand, bound to the high-affinity antagonist follistatin. Two follistatin molecules encircle activin, neutralizing the ligand by burying one-third of its residues and its receptor binding sites. Previous studies have suggested that type I receptor binding would not be blocked by follistatin, but the crystal structure reveals that the follistatin N-terminal domain has an unexpected fold that mimics a universal type I receptor motif and occupies this receptor binding site. The formation of follistatin:BMP:type I receptor complexes can be explained by the stoichiometric and geometric arrangement of the activin:follistatin complex. The mode of ligand binding by follistatin has important implications for its ability to neutralize homo- and heterodimeric ligands of this growth factor family.


    Organizational Affiliation

    Department of Biochemistry, Northwestern University, Evanston, Illinois 60208, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Inhibin beta A chain
A, B
116Homo sapiensMutation(s): 0 
Gene Names: INHBA
Find proteins for P08476 (Homo sapiens)
Go to Gene View: INHBA
Go to UniProtKB:  P08476
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Follistatin
C, D
288Homo sapiensMutation(s): 0 
Gene Names: FST
Find proteins for P19883 (Homo sapiens)
Go to Gene View: FST
Go to UniProtKB:  P19883
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MLI
Query on MLI

Download SDF File 
Download CCD File 
A, C
MALONATE ION
C3 H2 O4
OFOBLEOULBTSOW-UHFFFAOYSA-L
 Ligand Interaction
IR3
Query on IR3

Download SDF File 
Download CCD File 
A, B, C, D
IRIDIUM (III) ION
Ir
MILUBEOXRNEUHS-UHFFFAOYSA-N
 Ligand Interaction
MPD
Query on MPD

Download SDF File 
Download CCD File 
B
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.265 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 109.250α = 90.00
b = 120.820β = 90.00
c = 70.570γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SHARPphasing
CCP4data scaling
PDB_EXTRACTdata extraction
SCALAdata scaling
MAR345data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-11
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-07-27
    Type: Version format compliance
  • Version 1.4: 2017-10-11
    Type: Refinement description