2PZ1

Crystal Structure of Auto-inhibited Asef


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Release of autoinhibition of ASEF by APC leads to CDC42 activation and tumor suppression.

Mitin, N.Betts, L.Yohe, M.E.Der, C.J.Sondek, J.Rossman, K.L.

(2007) Nat.Struct.Mol.Biol. 14: 814-823

  • DOI: 10.1038/nsmb1290

  • PubMed Abstract: 
  • Autoinhibition of the Rho guanine nucleotide exchange factor ASEF is relieved by interaction with the APC tumor suppressor. Here we show that binding of the armadillo repeats of APC to a 'core APC-binding' (CAB) motif within ASEF, or truncation of th ...

    Autoinhibition of the Rho guanine nucleotide exchange factor ASEF is relieved by interaction with the APC tumor suppressor. Here we show that binding of the armadillo repeats of APC to a 'core APC-binding' (CAB) motif within ASEF, or truncation of the SH3 domain of ASEF, relieves autoinhibition, allowing the specific activation of CDC42. Structural determination of autoinhibited ASEF reveals that the SH3 domain forms an extensive interface with the catalytic DH and PH domains to obstruct binding and activation of CDC42, and the CAB motif is positioned adjacent to the SH3 domain to facilitate activation by APC. In colorectal cancer cell lines, full-length, but not truncated, APC activates CDC42 in an ASEF-dependent manner to suppress anchorage-independent growth. We therefore propose a model in which ASEF acts as a tumor suppressor when activated by APC and inactivation of ASEF by mutation or APC truncation promotes tumorigenesis.


    Organizational Affiliation

    Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Rho guanine nucleotide exchange factor 4
A
466Homo sapiensMutation(s): 0 
Gene Names: ARHGEF4 (KIAA1112)
Find proteins for Q9NR80 (Homo sapiens)
Go to Gene View: ARHGEF4
Go to UniProtKB:  Q9NR80
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.217 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 100.418α = 90.00
b = 79.883β = 122.99
c = 67.407γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
MLPHAREphasing
HKL-2000data reduction
REFMACrefinement
HKL-2000data scaling
PHASERphasing
SHELXDphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-08-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2017-10-18
    Type: Refinement description