2P4R

Structural basis for a novel interaction between AIP4 and beta-PIX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.001 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A novel interaction between atrophin-interacting protein 4 and beta-p21-activated kinase-interactive exchange factor is mediated by an SH3 domain.

Janz, J.M.Sakmar, T.P.Min, K.C.

(2007) J.Biol.Chem. 282: 28893-28903

  • DOI: 10.1074/jbc.M702678200

  • PubMed Abstract: 
  • Cross-talk between G protein-coupled receptors and receptor tyrosine kinase signaling pathways is crucial to the efficient relay and integration of cellular information. Here we identify and define the novel binding interaction of the E3 ubiquitin li ...

    Cross-talk between G protein-coupled receptors and receptor tyrosine kinase signaling pathways is crucial to the efficient relay and integration of cellular information. Here we identify and define the novel binding interaction of the E3 ubiquitin ligase atrophin-interacting protein 4 (AIP4) with the GTP exchange factor beta-p21-activated kinase-interactive exchange factor (beta PIX). We demonstrate that this interaction is mediated in part by the beta PIX-SH3 domain binding to a proline-rich stretch of AIP4. Analysis of the interaction by isothermal calorimetry is consistent with a heterotrimeric complex with one AIP4-derived peptide binding to two beta PIX-SH3 domains. We determined the crystal structure of the beta PIX-SH3.AIP4 complex to 2.0-A resolution. In contrast to the calorimetry results, the crystal structure shows a monomeric complex in which AIP4 peptide binds the beta PIX-SH3 domain as a canonical Class I ligand with an additional type II polyproline helix that makes extensive contacts with another face of beta PIX. Taken together, the novel interaction between AIP4 and beta PIX represents a new regulatory node for G protein-coupled receptor and receptor tyrosine kinase signal integration. Our structure of the beta PIX-SH3.AIP4 complex provides important insight into the mechanistic basis for beta PIX scaffolding of signaling components, especially those involved in cross-talk.


    Organizational Affiliation

    Laboratory of Molecular Biology and Biochemistry, The Rockefeller University, New York, New York 10021, USA. jjanz@rockefeller.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Rho guanine nucleotide exchange factor 7
A
59Rattus norvegicusMutation(s): 0 
Gene Names: Arhgef7 (Pak3bp, Pixb)
Find proteins for O55043 (Rattus norvegicus)
Go to UniProtKB:  O55043
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
E3 ubiquitin-protein ligase Itchy homolog
T
25Homo sapiensMutation(s): 0 
Gene Names: ITCH
EC: 2.3.2.26
Find proteins for Q96J02 (Homo sapiens)
Go to Gene View: ITCH
Go to UniProtKB:  Q96J02
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.001 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.217 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 41.747α = 90.00
b = 41.747β = 90.00
c = 149.278γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data collection
PDB_EXTRACTdata extraction
PHASERphasing
HKL-2000data scaling
REFMACrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-03-13 
  • Released Date: 2007-07-24 
  • Deposition Author(s): Min, K.C.

Revision History 

  • Version 1.0: 2007-07-24
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance