1MR1

Crystal Structure of a Smad4-Ski Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Mechanism of Smad4 Recognition by the Nuclear Oncoprotein Ski: Insights on Ski-mediated Repression of TGF-beta Signaling

Wu, J.-W.Krawitz, A.R.Chai, J.Li, W.Zhang, F.Luo, K.Shi, Y.

(2002) Cell 111: 357-367


  • PubMed Abstract: 
  • The Ski family of nuclear oncoproteins represses TGF-beta signaling through interactions with the Smad proteins. The crystal structure of the Smad4 binding domain of human c-Ski in complex with the MH2 domain of Smad4 reveals specific recognition of ...

    The Ski family of nuclear oncoproteins represses TGF-beta signaling through interactions with the Smad proteins. The crystal structure of the Smad4 binding domain of human c-Ski in complex with the MH2 domain of Smad4 reveals specific recognition of the Smad4 L3 loop region by a highly conserved interaction loop (I loop) from Ski. The Ski binding surface on Smad4 significantly overlaps with that required for binding of the R-Smads. Indeed, Ski disrupts the formation of a functional complex between the Co- and R-Smads, explaining how it could lead to repression of TGF-beta, activin, and BMP responses. Intriguingly, the structure of the Ski fragment, stabilized by a bound zinc atom, resembles the SAND domain, in which the corresponding I loop is responsible for DNA binding.


    Organizational Affiliation

    Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, Princeton, NJ 08544, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mothers against decapentaplegic homolog 4
A, B
235Homo sapiensMutation(s): 0 
Gene Names: SMAD4 (DPC4, MADH4)
Find proteins for Q13485 (Homo sapiens)
Go to Gene View: SMAD4
Go to UniProtKB:  Q13485
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ski oncogene
C, D
99Homo sapiensMutation(s): 0 
Gene Names: SKI
Find proteins for P12755 (Homo sapiens)
Go to Gene View: SKI
Go to UniProtKB:  P12755
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
C, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.231 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 109.800α = 90.00
b = 109.800β = 90.00
c = 141.100γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
AMoREphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-21
    Type: Initial release
  • Version 1.1: 2008-05-05
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance