Integrin alphavbeta1 promotes infection by human metapneumovirus.

Cseke G, Maginnis MS, Cox RG, Tollefson SJ, Podsiad AB, Wright DW, Dermody TS, Williams JV
Proc Natl Acad Sci U S A. 2009 106 (5): 1566-71

PMID: 19164533 · PMCID: PMC2629439 · DOI:10.1073/pnas.0801433106

Human metapneumovirus (hMPV) is a recently described paramyxovirus that causes lower respiratory infections in children and adults worldwide. The hMPV fusion (F) protein is a membrane-anchored glycoprotein and major protective antigen. All hMPV F protein sequences determined to date contain an Arg-Gly-Asp (RGD) sequence, suggesting that F engages RGD-binding integrins to mediate cell entry. The divalent cation chelator EDTA, which disrupts heterodimeric integrin interactions, inhibits infectivity of hMPV but not the closely related respiratory syncytial virus (RSV), which lacks an RGD motif. Function-blocking antibodies specific for alphavbeta1 integrin inhibit infectivity of hMPV but not RSV. Transfection of nonpermissive cells with alphav or beta1 cDNAs confers hMPV infectivity, whereas reduction of alphav and beta1 integrin expression by siRNA inhibits hMPV infection. Recombinant hMPV F protein binds to cells, whereas Arg-Gly-Glu (RGE)-mutant F protein does not. These data suggest that alphavbeta1 integrin is a functional receptor for hMPV.

MeSH Terms (10)

Animals Antibodies, Viral Humans Metapneumovirus Receptors, Vitronectin RNA, Small Interfering Swine Transfection Viral Fusion Proteins Virulence

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