Structure of the integrin alpha2beta1 binding collagen peptide

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

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Structure of the Integrin alpha2beta1-binding Collagen Peptide.

Emsley, J.Knight, C.G.Farndale, R.W.Barnes, M.J.

(2004) J Mol Biol 335: 1019-1028

  • DOI: https://doi.org/10.1016/j.jmb.2003.11.030
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We have determined the 1.8A crystal structure of a triple helical integrin-binding collagen peptide (IBP) with sequence (Gly-Pro-Hyp)(2)-Gly-Phe-Hyp-Gly-Glu-Arg-(Gly-Pro-Hyp)(3). The central GFOGER hexapeptide is recognised specifically by the integrins alpha2beta1, alpha1beta1, alpha10beta1 and alpha11beta1. These integrin/collagen interactions are implicated in a number of key physiological processes including cell adhesion, cell growth and differentiation, and pathological states such as thrombosis and tumour metastasis. Comparison of the IBP structure with the previously determined structure of an identical collagen peptide in complex with the integrin alpha2-I domain (IBP(c)) allows the first detailed examination of collagen in a bound and an unbound state. The IBP structure shows a direct and a water-mediated electrostatic interaction between Glu and Arg side-chains from adjacent strands, but no intra-strand interactions. The interactions between IBP Glu and Arg side-chains are disrupted upon integrin binding. A comparison of IBP and IBP(c) main-chain conformation reveals the flexible nature of the triple helix backbone in the imino-poor GFOGER region. This flexibility could be important to the integrin-collagen interaction and provides a possible explanation for the unique orientation of the three GFOGER strands observed in the integrin-IBP(c) complex crystal structure.

  • Organizational Affiliation

    Department of Biochemistry, University of Leicester LE17RH, Leicester, UK. je14@le.ac.uk


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
collagen alfa 1(I) chain peptide GPOGPOGFOGERGPOGPOGPO
A, B, C
23N/AMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for P02452 (Homo sapiens)
Explore P02452 
Go to UniProtKB:  P02452
PHAROS:  P02452
GTEx:  ENSG00000108821 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02452
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on HYP
A, B, C
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 29.6α = 90
b = 135.8β = 90
c = 25.4γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance