Crystal structure of the fibronectin 6FnI1-2FnII7FnI fragment

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 

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Implications for collagen binding from the crystallographic structure of fibronectin 6FnI1-2FnII7FnI

Erat, M.C.Schwarz-Linek, U.Pickford, A.R.Farndale, R.W.Campbell, I.D.Vakonakis, I.

(2010) J Biol Chem 285: 33764-33770

  • DOI: https://doi.org/10.1074/jbc.M110.139394
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Collagen and fibronectin (FN) are two abundant and essential components of the vertebrate extracellular matrix; they interact directly with cellular receptors and affect cell adhesion and migration. Past studies identified a FN fragment comprising six modules, (6)FnI(1-2)FnII(7-9)FnI, and termed the gelatin binding domain (GBD) as responsible for collagen interaction. Recently, we showed that the GBD binds tightly to a specific site within type I collagen and determined the structure of domains (8-9)FnI in complex with a peptide from that site. Here, we present the crystallographic structure of domains (6)FnI(1-2)FnII(7)FnI, which form a compact, globular unit through interdomain interactions. Analysis of NMR titrations with single-stranded collagen peptides reveals a dominant collagen interaction surface on domains (2)FnII and (7)FnI; a similar surface appears involved in interactions with triple-helical peptides. Models of the complete GBD, based on the new structure and the (8-9)FnI·collagen complex show a continuous putative collagen binding surface. We explore the implications of this model using long collagen peptides and discuss our findings in the context of FN interactions with collagen fibrils.

  • Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fibronectin 1220Homo sapiensMutation(s): 1 
Gene Names: FN1hCG_1813428
UniProt & NIH Common Fund Data Resources
Find proteins for P02751 (Homo sapiens)
Explore P02751 
Go to UniProtKB:  P02751
GTEx:  ENSG00000115414 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02751
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.947α = 90
b = 103.947β = 90
c = 102.143γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
XSCALEdata scaling
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Refinement description, Structure summary