Arginine-glycine-aspartic acid-specific binding by foot-and-mouth disease viruses to the purified integrin alpha v beta 3 in vitro
The integrin alpha v beta 3 has been shown to act as the receptor for internalization of foot-and-mouth disease virus (FMDV) (A12), with attachment being through a highly conserved RGD motif located on the G-H loop of viral capsid protein VP1. In addition, however, we have recently shown that effici...
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Published in | Journal of virology Vol. 71; no. 11; pp. 8357 - 8361 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.11.1997
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Online Access | Get full text |
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Summary: | The integrin alpha v beta 3 has been shown to act as the receptor for internalization of foot-and-mouth disease virus (FMDV) (A12), with attachment being through a highly conserved RGD motif located on the G-H loop of viral capsid protein VP1. In addition, however, we have recently shown that efficient infection of culture-grown cells by FMDV (O1BFS) requires binding to cell surface heparan sulfate. In this study, we have used a solid-phase receptor binding assay to characterize the binding by FMDV to purified alpha v beta 3 in the absence of heparan sulfate and other cell surface components. In this assay, FMDV (O1BFS) successfully replicated authentic ligand binding by cellular alpha v beta 3 in terms of its high affinity, dependence on divalent cations, and activation by manganese ions. Virus binding to this preparation of alpha v beta 3 was exquisitely sensitive to competition by short RGD-containing peptides (50% inhibition at < 10 super(-8) M peptide), and this inhibition was highly sequence specific, with the equivalent RGE peptide being at least 10 super(4) fold less effective as a competitor. Representative viruses of the other six serotypes of FMDV bound to alpha v beta 3 in a similar RGD-specific manner, although significant differences in sensitivity to RGD peptides suggest that the affinity of the different FMDV serotypes for alpha v beta 3 is influenced, in part, by the variable amino acid residues in the VP1 G-H loop on either side of the RGD. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0022-538X |
DOI: | 10.1128/JVI.71.11.8357-8361.1997 |