2BYV

Structure of the cAMP responsive exchange factor Epac2 in its auto- inhibited state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.245 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Cyclic-AMP Responsive Exchange Factor Epac2 in its Auto-Inhibited State

Rehmann, H.Das, J.Knipscheer, P.Wittinghofer, A.Bos, J.L.

(2006) Nature 439: 625

  • DOI: 10.1038/nature04468
  • Also Cited By: 3CF6

  • PubMed Abstract: 
  • Epac proteins (exchange proteins directly activated by cAMP) are guanine-nucleotide-exchange factors (GEFs) for the small GTP-binding proteins Rap1 and Rap2 that are directly regulated by the second messenger cyclic AMP and function in the control of ...

    Epac proteins (exchange proteins directly activated by cAMP) are guanine-nucleotide-exchange factors (GEFs) for the small GTP-binding proteins Rap1 and Rap2 that are directly regulated by the second messenger cyclic AMP and function in the control of diverse cellular processes, including cell adhesion and insulin secretion. Here we report the three-dimensional structure of full-length Epac2, a 110-kDa protein that contains an amino-terminal regulatory region with two cyclic-nucleotide-binding domains and a carboxy-terminal catalytic region. The structure was solved in the absence of cAMP and shows the auto-inhibited state of Epac. The regulatory region is positioned with respect to the catalytic region by a rigid, tripartite beta-sheet-like structure we refer to as the 'switchboard' and an ionic interaction we call the 'ionic latch'. As a consequence of this arrangement, the access of Rap to the catalytic site is sterically blocked. Mutational analysis suggests a model for cAMP-induced Epac activation with rigid body movement of the regulatory region, the features of which are universally conserved in cAMP-regulated proteins.


    Related Citations: 
    • Structure and Regulation of the Camp Binding Domains of Epac2
      Rehmann, H.,Prakash, B.,Wolf, E.,Rueppel, A.,Derooij, J.,Bos, J.L.,Wittinghofer, A.
      (2002) Nat.Struct.Mol.Biol. 10: 26


    Organizational Affiliation

    Department of Physiological Chemistry and Centre for Biomedical Genetics, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG Utrecht, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RAP GUANINE NUCLEOTIDE EXCHANGE FACTOR 4
E
999Mus musculusMutation(s): 0 
Gene Names: Rapgef4 (Cgef2, Epac2)
Find proteins for Q9EQZ6 (Mus musculus)
Go to UniProtKB:  Q9EQZ6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.245 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 76.406α = 90.00
b = 97.038β = 90.00
c = 172.101γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
MOLREPphasing
XSCALEdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-02-02
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance