Identification of a Novel Recognition Sequence for the Integrin Alpha 4 Beta 1 in the COOH-terminal Heparin-binding Domain of Fibronectin

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1991 Dec 1

PMID 1756719

Citations 43

Authors

A P Mould

M J Humphries

Affiliations

Soon will be listed here.

Abstract

The type III connecting segment of fibronectin contains two cell binding sites, represented by the peptides CS1 and CS5, that are recognized by the integrin receptor alpha 4 beta 1. Using assays measuring the spreading of A375-SM human melanoma cells, we now report that the adhesion promoting activity of a 29 kDa protease fragment of fibronectin containing the COOH-terminal heparin-binding domain (HepII), but lacking CS1 and CS5, is completely sensitive to anti-alpha 4 and anti-beta 1 antibodies, suggesting that HepII contains a third alpha 4 beta 1-binding sequence. Examination of the primary structure of HepII revealed a sequence with homology to CS1. A 19mer peptide spanning this region (designated H1) was found to support cell spreading to the same level as the 29 kDa fragment. H1-dependent adhesion was completely sensitive to anti-alpha 4 and anti-beta 1 antibodies. When soluble peptides were tested for their ability to block cell spreading on the 29 kDa fragment, a 13mer peptide comprising the central core of H1 was found to be completely inhibitory. The active region of H1 was localized to the pentapeptide IDAPS, which is homologous to LDVPS from the active site of CS1. Taken together, these results identify a novel peptide sequence in the HepII region of fibronectin that supports alpha 4 beta 1-dependent cell adhesion.

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