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. 1997 Apr 1;323(Pt 1):51–60. doi: 10.1042/bj3230051

N-terminal type I modules required for fibronectin binding to fibroblasts and to fibronectin's III1 module.

J Sottile 1, D F Mosher 1
PMCID: PMC1218314  PMID: 9173901

Abstract

Assembly of fibronectin fibrils occurs at the surface of substrate-attached cells and is mediated by the first to the fifth type I modules in the N-terminal 70 kDa portion of the molecule. The first type III module (III1) of fibronectin, not present in the 70 kDa portion, contains a conformation-dependent binding site for the 70 kDa N-terminal region of fibronectin, suggesting that the III1 module on cell-surface fibronectin may serve as a binding site for fibronectin's N-terminus on substrate-attached cells. To explore this possiblility, we compared the ability of mutant recombinant 70 kDa proteins containing deletions of one or several of the first five type I modules to bind to fibroblasts and to III1. Proteins containing the fourth and fiftBiomolecular Chemistry and Medicine, University of Wisconsin, Madison, WI 53706U.S.A.Assembly of fibronectin fibrils occurs at the surface of substrate-attached cells and is mediated by the first to the fifth type I modules in the N-terminal 70 kDa portion of the molecule. The first type III module (III1) of fibronectin, not present in the 70 kDa portion, contains a conh as 70 kDa deletion mutants lacking I4 and I5 also bound to the cell surface, and deletion mutants lacking I1-3 and I4-5 both competed only partially for binding of 125I-labelled fibronectin or 70 kDa protein. These data indicate that the N-terminal part of fibronectin binds to III1 via I4 and I5 and that interactions in addition to that of I4 and I5 with III1 are important for cell-surface-mediated fibronectin polymerization.

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Selected References

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