1YGS

CRYSTAL STRUCTURE OF THE SMAD4 TUMOR SUPPRESSOR C-TERMINAL DOMAIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A structural basis for mutational inactivation of the tumour suppressor Smad4.

Shi, Y.Hata, A.Lo, R.S.Massague, J.Pavletich, N.P.

(1997) Nature 388: 87-93

  • DOI: 10.1038/40431

  • PubMed Abstract: 
  • The Smad4/DPC4 tumour suppressor is inactivated in nearly half of pancreatic carcinomas and to a lesser extent in a variety of other cancers. Smad4/DPC4, and the related tumour suppressor Smad2, belong to the SMAD family of proteins that mediate sign ...

    The Smad4/DPC4 tumour suppressor is inactivated in nearly half of pancreatic carcinomas and to a lesser extent in a variety of other cancers. Smad4/DPC4, and the related tumour suppressor Smad2, belong to the SMAD family of proteins that mediate signalling by the TGF-beta/activin/BMP-2/4 cytokine superfamily from receptor Ser/Thr protein kinases at the cell surface to the nucleus. SMAD proteins, which are phosphorylated by the activated receptor, propagate the signal, in part, through homo- and hetero-oligomeric interactions. Smad4/DPC4 plays a central role as it is the shared hetero-oligomerization partner of the other SMADs. The conserved carboxy-terminal domains of SMADs are sufficient for inducing most of the ligand-specific effects, and are the primary targets of tumorigenic inactivation. We now describe the crystal structure of the C-terminal domain (CTD) of the Smad4/DPC4 tumour suppressor, determined at 2.5 A resolution. The structure reveals that the Smad4/DPC4 CTD forms a crystallographic trimer through a conserved protein-protein interface, to which the majority of the tumour-derived missense mutations map. These mutations disrupt homo-oligomerization in vitro and in vivo, indicating that the trimeric assembly of the Smad4/DPC4 CTD is critical for signalling and is disrupted by tumorigenic mutations.


    Organizational Affiliation

    Cellular Biochemistry and Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SMAD4
A
234Homo sapiensMutation(s): 0 
Gene Names: SMAD4 (DPC4, MADH4)
Find proteins for Q13485 (Homo sapiens)
Go to Gene View: SMAD4
Go to UniProtKB:  Q13485
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.219 
  • Space Group: F 41 3 2
Unit Cell:
Length (Å)Angle (°)
a = 197.842α = 90.00
b = 197.842β = 90.00
c = 197.842γ = 90.00
Software Package:
Software NamePurpose
DMmodel building
SQUASHphasing
X-PLORmodel building
DMphasing
SCALEPACKdata scaling
X-PLORphasing
X-PLORrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-07-08
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance