5TYT

Crystal Structure of the PDZ domain of RhoGEF bound to CXCR2 C-terminal peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.398 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of PDZ-mediated chemokine receptor CXCR2 scaffolding by guanine nucleotide exchange factor PDZ-RhoGEF.

Spellmon, N.Holcomb, J.Niu, A.Choudhary, V.Sun, X.Zhang, Y.Wan, J.Doughan, M.Hayden, S.Hachem, F.Brunzelle, J.Li, C.Yang, Z.

(2017) Biochem. Biophys. Res. Commun. 485: 529-534

  • DOI: 10.1016/j.bbrc.2017.02.010

  • PubMed Abstract: 
  • The CXC chemokine receptor 2 (CXCR2) is a G protein coupled receptor mediating interleukin-8 chemotactic signaling and plays an important role in neutrophil mobility and tumor migration. However, efficient CXCR2 signaling requires PDZ domain-mediated ...

    The CXC chemokine receptor 2 (CXCR2) is a G protein coupled receptor mediating interleukin-8 chemotactic signaling and plays an important role in neutrophil mobility and tumor migration. However, efficient CXCR2 signaling requires PDZ domain-mediated scaffolding of signaling complexes at the plasma membrane and functional coupling of the signaling to specific downstream signaling pathways, in which only one PDZ protein has been characterized to interact with CXCR2. Here, we identified five novel CXCR2-binding PDZ-containing proteins, among which PDZ-RhoGEF is of particular interest because this PDZ and RGS-containing guanine nucleotide exchange factor (GEF) is also involved in cell signaling and mobility. To reveal the molecular basis of the interaction, we solved the crystal structure of PDZ-RhoGEF PDZ domain in complex with the CXCR2 C-terminal PDZ binding motif. The structure reveals that the PDZ-CXCR2 binding specificity is achieved by numerous hydrogen bonds and hydrophobic contacts with the last four CXCR2 residues contributing to specific interactions. Structural comparison of CXCR2-binding PDZ domains and PDZ-RhoGEF PDZ bound with different ligands reveals PDZ- and ligand-specific interactions that may underlie the ability of promiscuous CXCR2 binding by different PDZ domains and PDZ binding promiscuity. The structure also reveals an unexpected asymmetric disulfide bond-linked PDZ dimer that allows simultaneous parallel binding of CXCR2 to two PDZ domains. This study provides not only the structural basis for PDZ-mediated CXCR2-PDZ-RhoGEF interaction, but also a new mode of PDZ dimerization, which both could prove valuable in understanding signaling complex scaffolding in CXCR2 signaling and coupling to specific signaling pathways.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine, Detroit, MI, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Rho guanine nucleotide exchange factor 11, C-X-C chemokine receptor type 2 chimera
A, B, C, D
89Homo sapiensMutation(s): 0 
Gene Names: ARHGEF11 (KIAA0380)
Find proteins for O15085 (Homo sapiens)
Go to Gene View: ARHGEF11
Go to UniProtKB:  O15085
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.398 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.206 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 61.739α = 90.00
b = 66.633β = 90.00
c = 168.440γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
Aimlessdata scaling
XDSdata reduction
PHENIXrefinement
AutoPROCdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-02-22
    Type: Initial release
  • Version 1.1: 2017-03-22
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Data collection, Refinement description