Possible involvement of the interaction of the alpha 5 subunit of alpha 5 beta 1 integrin with the synergistic region of the central cell-binding domain of fibronectin in cells to fibronectin binding.

Abstract:

:The interaction between the central cell-binding domain (CBD) of fibronectin (FN) and its receptor integrin alpha 5 beta 1 was analyzed by both ligand-binding and cell adhesion assays. The ligands used were a CBD fragment (pCBD) of human plasma fibronectin and its recombinant versions including wild type CBD (wtCBD) and its two mutants (CBD-I, lacking the integrin recognition sequence Arg-Gly-Asp from wtCBD and CBD-II, missing the synergistic regions). The ligand-binding assay showed that CBD-I and CBD-II bind to the receptor, although the binding ability of the former was weaker than that of the latter. The affinity of pCBD to the receptor was much higher than the two mutants. The cell adhesion assay also revealed that cells were able to attach and spread on CBD-I to the same extent as on CBD-II, although the extent of spreading on the two mutant polypeptides was less than 4.1% of pCBD or wtCBD. On the other hand, beta 1-dependent cell spreading on CBD-II was not inhibited by the monoclonal antibody specific for the alpha 5 subunit, while that on CBD-I, wtCBD, or pCBD was inhibited by the same antibody. The present study suggests that the alpha 5 subunit does not participate in direct binding to the Arg-Gly-Asp site in CBD when cells adhere to FN through the integrin alpha 5 beta 1, but that it is involved in the interaction with the synergistic regions of CBD, which then enhances the binding of the beta 1 subunit to the Arg-Gly-Asp sequence containing CBD.

journal_name

Exp Cell Res

authors

Obara M,Yoshizato K

doi

10.1006/excr.1995.1033

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

273-6

issue

1

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(85)71033-6

journal_volume

216

pub_type

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