1G88

S4AFL3ARG515 MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The L3 loop and C-terminal phosphorylation jointly define Smad protein trimerization.

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

(2001) Nat.Struct.Mol.Biol. 8: 248-253

  • DOI: 10.1038/84995

  • PubMed Abstract: 
  • Smad proteins mediate the transforming growth factor beta responses. C-terminal phosphorylation of R-Smads leads to the recruitment of Smad4 and the formation of active signaling complexes. We investigated the mechanism of phosphorylation-induced Sma ...

    Smad proteins mediate the transforming growth factor beta responses. C-terminal phosphorylation of R-Smads leads to the recruitment of Smad4 and the formation of active signaling complexes. We investigated the mechanism of phosphorylation-induced Smad complex formation with an activating pseudo-phosphorylated Smad3. Pseudo-phosphorylated Smad3 has a greater propensity to homotrimerize, and recruits Smad4 to form a heterotrimer containing two Smad3 and one Smad4. The trimeric interaction is mediated through conserved interfaces to which tumorigenic mutations map. Furthermore, a conserved Arg residue within the L3 loop, located near the C-terminal phosphorylation sites of the neighboring subunit, is essential for trimerization. We propose that the phosphorylated C-terminal residues interact with the L3 loop of the neighboring subunit to stabilize the trimer interaction.


    Organizational Affiliation

    Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 55 Lake Ave. North, Worcester, Massachusetts 01655, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SMAD4
A, B, C
268Homo sapiensGene 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: 3 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.203 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 140.855α = 90.00
b = 140.855β = 90.00
c = 194.613γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
CCP4data scaling
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-11-29
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance