1U7V

Crystal Structure of the phosphorylated Smad2/Smad4 heterotrimeric complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of heteromeric smad protein assembly in tgf-Beta signaling

Chacko, B.M.Qin, B.Y.Tiwari, A.Shi, G.Lam, S.Hayward, L.J.De Caestecker, M.Lin, K.

(2004) Mol.Cell 15: 813-823

  • DOI: 10.1016/j.molcel.2004.07.016
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The formation of protein complexes between phosphorylated R-Smads and Smad4 is a central event in the TGF-beta signaling pathway. We have determined the crystal structure of two R-Smad/Smad4 complexes, Smad3/Smad4 to 2.5 angstroms, and Smad2/Smad4 to ...

    The formation of protein complexes between phosphorylated R-Smads and Smad4 is a central event in the TGF-beta signaling pathway. We have determined the crystal structure of two R-Smad/Smad4 complexes, Smad3/Smad4 to 2.5 angstroms, and Smad2/Smad4 to 2.7 angstroms. Both complexes are heterotrimers, comprising two phosphorylated R-Smad subunits and one Smad4 subunit, a finding that was corroborated by isothermal titration calorimetry and mutational studies. Preferential formation of the R-Smad/Smad4 heterotrimer over the R-Smad homotrimer is largely enthalpy driven, contributed by the unique presence of strong electrostatic interactions within the heterotrimeric interfaces. The study supports a common mechanism of Smad protein assembly in TGF-beta superfamily 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
Mothers against decapentaplegic homolog 2
A, C
198Homo sapiensMutation(s): 0 
Gene Names: SMAD2 (MADH2, MADR2)
Find proteins for Q15796 (Homo sapiens)
Go to Gene View: SMAD2
Go to UniProtKB:  Q15796
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Mothers against decapentaplegic homolog 4
B
236Homo sapiensMutation(s): 0 
Gene Names: SMAD4 (DPC4, MADH4)
Find proteins for Q13485 (Homo sapiens)
Go to Gene View: SMAD4
Go to UniProtKB:  Q13485
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
A, C
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.243 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 49.240α = 90.00
b = 59.951β = 90.00
c = 207.418γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance