Herpesviruses are associated with a variety of disease in the human host, ranging from asymptomatic infections to life threatening disease, including encephalitis and cancer. In addition to playing a direct role in cancer genesis, herpesviruses pose an increased risk to cancer patients who may develop debilitating and life- threatening herpesvirus infections. Genital herpes simplex virus (HSV) lesions, even if clinically inapparent, can facilitate the transfer of HIV-infected cells or free virus from one individual to another, and HIV infection and AIDS increase the risks of developing certain kinds of cancer. HSV-1 serves as a prototypic herpesvirus family member and provides an ideal model to understand the requirements for virus infection since it replicates well in cell culture and many reagents have been developed for its study. Herpesvirus entry into cells requires fusion of the outer envelope of the virus with a cell membrane. Spread of infection can occur via infectious virus or virus-induced cell fusion. The ultimate objective of studies described here is to understand how herpesviruses, specifically HSV-1, induce membrane fusion, the process required for viral entry and cell fusion. Requirements for HSV-induced membrane fusion include the coordinated activities of four HSV glycoproteins (gD, the hererodimeric gH/gL complex, and gB) and specific cellular receptors. Our central hypothesis is that gD, present in the viral envelope or on an infected cell surface, binds to a cellular receptor, such as nectin-1, on an uninfected cell and activates gH/gL and gB via protein-protein interactions resulting in fusion mediated by gB. In three aims, we plan to define the sequence requirements and domains contained on gD, gH/gL and gB that are required to mediate membrane fusion and to begin studies to solve the prefusion conformation of gB. The proposed studies will result in a better understanding of the basic mechanisms that are central to herpesvirus infection of cells and virus spread from cell-to-cell. The results of these studies will lead to an understanding of the mechanism of herpesvirus-induced membrane fusion and to new approaches for the prevention and treatment of herpesvirus infections.

Public Health Relevance

This proposed research will further define the molecular mechanisms involved in herpesvirus infection using the prototypic human herpesvirus herpes simplex virus 1 (HSV-1). Herpesviruses cause significant disease and morbidity within the human population ranging from asymptomatic infections and blindness to life threatening illness such as encephalitis and cancer. The proposed research may result in the identification of new therapeutics for herpesviruses that will lessen the pathologies associated with viral infection.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Project (R01)
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Virology - B Study Section (VIRB)
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Daschner, Phillip J
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Northwestern University at Chicago
Schools of Medicine
United States
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Fan, Qing; Kopp, Sarah J; Byskosh, Nina C et al. (2018) Natural Selection of Glycoprotein B Mutations That Rescue the Small-Plaque Phenotype of a Fusion-Impaired Herpes Simplex Virus Mutant. MBio 9:
Edwards, Rebecca G; Longnecker, Richard (2017) Herpesvirus Entry Mediator and Ocular Herpesvirus Infection: More than Meets the Eye. J Virol 91:
Fan, Qing; Kopp, Sarah; Connolly, Sarah A et al. (2017) Mapping sites of herpes simplex virus type 1 glycoprotein D that permit insertions and impact gD and gB receptors usage. Sci Rep 7:43712
Fan, Qing; Kopp, Sarah J; Connolly, Sarah A et al. (2017) Structure-Based Mutations in the Herpes Simplex Virus 1 Glycoprotein B Ectodomain Arm Impart a Slow-Entry Phenotype. MBio 8:
Wilcox, Douglas R; Longnecker, Richard (2016) The Herpes Simplex Virus Neurovirulence Factor ?34.5: Revealing Virus-Host Interactions. PLoS Pathog 12:e1005449
Wilcox, Douglas R; Folmsbee, Stephen S; Muller, William J et al. (2016) The Type I Interferon Response Determines Differences in Choroid Plexus Susceptibility between Newborns and Adults in Herpes Simplex Virus Encephalitis. MBio 7:e00437-16
Wilcox, Douglas R; Muller, William J; Longnecker, Richard (2015) HSV targeting of the host phosphatase PP1? is required for disseminated disease in the neonate and contributes to pathogenesis in the brain. Proc Natl Acad Sci U S A 112:E6937-44
Lajko, Michelle; Haddad, Alexander F; Robinson, Carolyn A et al. (2015) Using proximity biotinylation to detect herpesvirus entry glycoprotein interactions: Limitations for integral membrane glycoproteins. J Virol Methods 221:81-9
Wilcox, Douglas R; Wadhwani, Nitin R; Longnecker, Richard et al. (2015) Differential reliance on autophagy for protection from HSV encephalitis between newborns and adults. PLoS Pathog 11:e1004580
Fan, Qing; Longnecker, Richard; Connolly, Sarah A (2015) A Functional Interaction between Herpes Simplex Virus 1 Glycoprotein gH/gL Domains I and II and gD Is Defined by Using Alphaherpesvirus gH and gL Chimeras. J Virol 89:7159-69

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