3GXE image
Entry Detail
PDB ID:
3GXE
Keywords:
Title:
Complex of a Low Affinity Collagen Site with the Fibronectin 8-9FnI Domain Pair
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2009-04-02
Release Date:
2010-04-07
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.27
R-Value Work:
0.21
R-Value Observed:
0.22
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Fibronectin
Mutations:N528Q, R534K
Chain IDs:A (auth: B), C (auth: A)
Chain Length:93
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Collagen alpha-1(I) chain
Chain IDs:D (auth: E)
Chain Length:23
Number of Molecules:1
Biological Source:
Polymer Type:polypeptide(L)
Description:Collagen alpha-1(I) chain
Chain IDs:B (auth: F)
Chain Length:23
Number of Molecules:1
Biological Source:
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
HYP D PRO 4-HYDROXYPROLINE
HZP B PRO (4S)-4-HYDROXY-L-PROLINE
Primary Citation
Structural analysis of collagen type I interactions with human fibronectin reveals a cooperative binding mode
J.Biol.Chem. 288 17441 17450 (2013)
PMID: 23653354 DOI: 10.1074/jbc.M113.469841

Abstact

Despite its biological importance, the interaction between fibronectin (FN) and collagen, two abundant and crucial tissue components, has not been well characterized on a structural level. Here, we analyzed the four interactions formed between epitopes of collagen type I and the collagen-binding fragment (gelatin-binding domain (GBD)) of human FN using solution NMR, fluorescence, and small angle x-ray scattering methods. Collagen association with FN modules (8-9)FnI occurs through a conserved structural mechanism but exhibits a 400-fold disparity in affinity between collagen sites. This disparity is reduced in the full-length GBD, as (6)FnI(1-2)FnII(7)FnI binds a specific collagen epitope next to the weakest (8-9)FnI-binding site. The cooperative engagement of all GBD modules with collagen results in four broadly equipotent FN-collagen interaction sites. Collagen association stabilizes a distinct monomeric GBD conformation in solution, giving further evidence to the view that FN fragments form well defined functional and structural units.

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Primary Citation of related structures