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Journal of Virology, June 2005, p. 7419-7430, Vol. 79, No. 12
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.12.7419-7430.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Pilar Perez-Romero,1
Gregory DeLassus,1
Santiago R. Lopez,1
Sarah Sutter,2
Ning McLaren,1 and
A. Oveta Fuller1,2*
Department of Microbiology and Immunology,1 Program in Cellular and Molecular Biology, School of Medicine, University of Michigan, Ann Arbor, Michigan 48109-06202
Received 28 September 2004/ Accepted 14 February 2005
We isolated a human cDNA by expression cloning and characterized its gene product as a new human protein that enables entry and infection of herpes simplex virus (HSV). The gene, designated hfl-B5, encodes a type II cell surface membrane protein, B5, that is broadly expressed in human primary tissue and cell lines. It contains a high-scoring heptad repeat at the extracellular C terminus that is predicted to form an
-helix for coiled coils like those in cellular SNAREs or in some viral fusion proteins. A synthetic 30-mer peptide that has the same sequence as the heptad repeat
-helix blocks HSV infection of B5-expressing porcine cells and human HEp-2 cells. Transient expression of human B5 in HEp-2 cells results in increased polykarocyte formation even in the absence of viral proteins. The B5 protein fulfills all criteria as a receptor or coreceptor for HSV entry. Use by HSV of a human cellular receptor, such as B5, that contains putative membrane fusion domains provides an example where a pathogenic virus with broad tropism has usurped a widely expressed cellular protein to function in infection at events that lead to membrane fusion.
Present address: NIAID, Bldg. 10, Rm. 11N214, Bethesda, MD 20892.
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