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Effects on rotavirus cell binding and infection of monomeric and polymeric peptides containing alpha2beta1 and alphaxbeta2 integrin ligand sequences.

Abstract：

:Integrin-using rotaviruses bind MA104 cell surface alpha2beta1 integrin via the Asp-Gly-Glu (DGE) sequence in virus spike protein VP4 and interact with alphaxbeta2 integrin during cell entry through outer capsid protein VP7. Infection is inhibited by the alpha2beta1 ligand Asp-Gly-Glu-Ala (DGEA) and the alphaxbeta2 ligand Gly-Pro-Arg-Pro (GPRP), and virus-alpha2beta1 binding is increased by alpha2beta1 activation. In this study, we analyzed the effects of monomers and polymers containing DGEA-, GPRP-, and DGEA-related peptides on rotavirus binding and infection in intestinal (Caco-2) and kidney (MA104) cells and virus binding to recombinant alpha2beta1. Blockade of rotavirus-cell binding and infection by peptides and anti-alpha2 antibody showed that Caco-2 cell entry is dependent on virus binding to alpha2beta1 and interaction with alphaxbeta2. At up to 0.5 mM, monomeric DGEA and DGAA inhibited binding to alpha2beta1 and infection. At higher concentrations, DGEA and DGAA showed a reduced ability to inhibit virus-cell binding and infection that depended on virus binding to alpha2beta1 but occurred without alteration in cell surface expression of alpha2, beta2, or alphavbeta3 integrin. This loss of DGEA activity was abolished by genistein treatment and so was dependent on tyrosine kinase signaling. It is proposed that this signaling activated existing cell surface alpha2beta1 to increase virus-cell attachment and entry. Polymeric peptides containing DGEA and GPRP or GPRP only were inhibitory to SA11 infection at approximately 10-fold lower concentrations than peptide monomers. As polymerization can improve peptide inhibition of virus-receptor interactions, this approach could be useful in the development of inhibitors of receptor recognition by other viruses.

journal_name

J Virol

journal_title

Journal of virology

authors

Graham KL,Zeng W,Takada Y,Jackson DC,Coulson BS

doi

10.1128/JVI.78.21.11786-11797.2004

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

11786-97

issue

eissn

0022-538X

issn

1098-5514

pii

78/21/11786

journal_volume

pub_type

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Effects on rotavirus cell binding and infection of monomeric and polymeric peptides containing alpha2beta1 and alphaxbeta2 integrin ligand sequences.