5MEZ

Crystal structure of Smad4-MH1 bound to the GGCT site.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for genome wide recognition of 5-bp GC motifs by SMAD transcription factors.

Martin-Malpartida, P.Batet, M.Kaczmarska, Z.Freier, R.Gomes, T.Aragon, E.Zou, Y.Wang, Q.Xi, Q.Ruiz, L.Vea, A.Marquez, J.A.Massague, J.Macias, M.J.

(2017) Nat Commun 8: 2070-2070

  • DOI: 10.1038/s41467-017-02054-6
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Smad transcription factors activated by TGF-β or by BMP receptors form trimeric complexes with Smad4 to target specific genes for cell fate regulation. The CAGAC motif has been considered as the main binding element for Smad2/3/4, whereas Smad1/5/8 h ...

    Smad transcription factors activated by TGF-β or by BMP receptors form trimeric complexes with Smad4 to target specific genes for cell fate regulation. The CAGAC motif has been considered as the main binding element for Smad2/3/4, whereas Smad1/5/8 have been thought to preferentially bind GC-rich elements. However, chromatin immunoprecipitation analysis in embryonic stem cells showed extensive binding of Smad2/3/4 to GC-rich cis-regulatory elements. Here, we present the structural basis for specific binding of Smad3 and Smad4 to GC-rich motifs in the goosecoid promoter, a nodal-regulated differentiation gene. The structures revealed a 5-bp consensus sequence GGC(GC)|(CG) as the binding site for both TGF-β and BMP-activated Smads and for Smad4. These 5GC motifs are highly represented as clusters in Smad-bound regions genome-wide. Our results provide a basis for understanding the functional adaptability of Smads in different cellular contexts, and their dependence on lineage-determining transcription factors to target specific genes in TGF-β and BMP pathways.


    Organizational Affiliation

    Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028, Barcelona, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MH1 domain of human Smad4
A, B
135Homo 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
MoleculeChainsLengthOrganism
DNA (5'-D(P*GP*CP*AP*GP*GP*CP*TP*AP*GP*CP*CP*TP*GP*CP*A)-3')D,E16Homo sapiens
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.217 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 64.790α = 90.00
b = 79.060β = 90.00
c = 114.160γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
BUSTERrefinement
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-11-15
    Type: Initial release
  • Version 1.1: 2017-12-27
    Type: Database references