1KHU

Smad1 crystal structure reveals the details of BMP signaling pathway


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of Smad1 activation by receptor kinase phosphorylation.

Qin, B.Y.Chacko, B.M.Lam, S.S.de Caestecker, M.P.Correia, J.J.Lin, K.

(2001) Mol.Cell 8: 1303-1312


  • PubMed Abstract: 
  • Phosphorylation of Smad1 at the conserved carboxyl terminal SVS sequence activates BMP signaling. Here we report the crystal structure of the Smad1 MH2 domain in a conformation that reveals the structural effects of phosphorylation and a molecular me ...

    Phosphorylation of Smad1 at the conserved carboxyl terminal SVS sequence activates BMP signaling. Here we report the crystal structure of the Smad1 MH2 domain in a conformation that reveals the structural effects of phosphorylation and a molecular mechanism for activation. Within a trimeric subunit assembly, the SVS sequence docks near two putative phosphoserine binding pockets of the neighboring molecule, in a position ready to interact upon phosphorylation. The MH2 domain undergoes concerted conformational changes upon activation, which signal Smad1 dissociation from the receptor kinase for subsequent heteromeric assembly with Smad4. Biochemical and modeling studies reveal unique favorable interactions within the Smad1/Smad4 heteromeric interface, providing a structural basis for their association in signaling.


    Organizational Affiliation

    Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01655, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SMAD1
A, B, C, D
218Homo sapiensMutation(s): 0 
Gene Names: SMAD1 (BSP1, MADH1, MADR1)
Find proteins for Q15797 (Homo sapiens)
Go to Gene View: SMAD1
Go to UniProtKB:  Q15797
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.239 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 138.129α = 90.00
b = 138.129β = 90.00
c = 199.340γ = 120.00
Software Package:
Software NamePurpose
CCP4data scaling
DENZOdata reduction
SCALAdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2001-12-01 
  • Released Date: 2001-12-12 
  • Deposition Author(s): Qin, B.Y., Lin, K.

Revision History 

  • Version 1.0: 2001-12-12
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance