2N55

Structure of constitutively monomeric CXCL12 in complex with the CXCR4 N-terminus


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for chemokine recognition by a G protein-coupled receptor and implications for receptor activation.

Ziarek, J.J.Kleist, A.B.London, N.Raveh, B.Montpas, N.Bonneterre, J.St-Onge, G.DiCosmo-Ponticello, C.J.Koplinski, C.A.Roy, I.Stephens, B.Thelen, S.Veldkamp, C.T.Coffman, F.D.Cohen, M.C.Dwinell, M.B.Thelen, M.Peterson, F.C.Heveker, N.Volkman, B.F.

(2017) Sci Signal 10: --

  • DOI: 10.1126/scisignal.aah5756

  • PubMed Abstract: 
  • Chemokines orchestrate cell migration for development, immune surveillance, and disease by binding to cell surface heterotrimeric guanine nucleotide-binding protein (G protein)-coupled receptors (GPCRs). The array of interactions between the nearly 5 ...

    Chemokines orchestrate cell migration for development, immune surveillance, and disease by binding to cell surface heterotrimeric guanine nucleotide-binding protein (G protein)-coupled receptors (GPCRs). The array of interactions between the nearly 50 chemokines and their 20 GPCR targets generates an extensive signaling network to which promiscuity and biased agonism add further complexity. The receptor CXCR4 recognizes both monomeric and dimeric forms of the chemokine CXCL12, which is a distinct example of ligand bias in the chemokine family. We demonstrated that a constitutively monomeric CXCL12 variant reproduced the G protein-dependent and β-arrestin-dependent responses that are associated with normal CXCR4 signaling and lead to cell migration. In addition, monomeric CXCL12 made specific contacts with CXCR4 that are not present in the structure of the receptor in complex with a dimeric form of CXCL12, a biased agonist that stimulates only G protein-dependent signaling. We produced an experimentally validated model of an agonist-bound chemokine receptor that merged a nuclear magnetic resonance-based structure of monomeric CXCL12 bound to the amino terminus of CXCR4 with a crystal structure of the transmembrane domains of CXCR4. The large CXCL12:CXCR4 protein-protein interface revealed by this structure identified previously uncharacterized functional interactions that fall outside of the classical "two-site model" for chemokine-receptor recognition. Our model suggests a mechanistic hypothesis for how interactions on the extracellular face of the receptor may stimulate the conformational changes required for chemokine receptor-mediated signal transduction.


    Organizational Affiliation

    Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI 53226, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stromal cell-derived factor 1
A
70Homo sapiensMutation(s): 2 
Gene Names: CXCL12 (SDF1, SDF1A, SDF1B)
Find proteins for P48061 (Homo sapiens)
Go to Gene View: CXCL12
Go to UniProtKB:  P48061
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
C-X-C chemokine receptor type 4
B
40Homo sapiensMutation(s): 1 
Gene Names: CXCR4
Find proteins for P61073 (Homo sapiens)
Go to Gene View: CXCR4
Go to UniProtKB:  P61073
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-04-27
    Type: Initial release
  • Version 1.1: 2016-05-11
    Type: Database references
  • Version 1.2: 2016-05-25
    Type: Database references
  • Version 1.3: 2017-05-03
    Type: Database references