1KHU

Smad1 crystal structure reveals the details of BMP signaling pathway

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 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

  • DOI: 10.1016/s1097-2765(01)00417-8
  • Primary Citation of Related Structures:  
    1KHU

  • 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 mechanism for activation ...

    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: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SMAD1A, B, C, D218Homo sapiensMutation(s): 0 
Gene Names: SMAD1, BSP1, MADH1, MADR1
UniProt & NIH Common Fund Data Resources
Find proteins for Q15797 (Homo sapiens)
Explore Q15797 
Go to UniProtKB:  Q15797
PHAROS:  Q15797
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15797
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.239 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 138.129α = 90
b = 138.129β = 90
c = 199.34γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling
CNSrefinement
CCP4data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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