title: Association of a cellular 21-kDa transmembrane protein (VAP21) with enveloped viruses.
abstract: We reported previously that the rabies virions contained a 21-kDa cellular transmembrane protein (referred to as VAP21) as a minor component (Sagara, J. et al, Microbiol. Immunol. 41(12): 947-955, 1997). In this study, we further examined the possible interactions of VAP21 with other enveloped viruses, including the vesicular stomatitis virus (VSV; negative-stranded RNA virus), Sindbis virus (positive-stranded RNA virus) and herpes simplex virus type 1 (HSV-1; double-stranded DNA virus). An immunoblot analysis demonstrated that all of these enveloped viruses contained VAP21 in the virion as a minor component. Immunoprecipitation studies suggested that VAP21 was associated with certain viral proteins in the cell, such as the matrix (M) protein of VSV, a capsid protein of Sindbis virus, and at least a capsid protein (VP5) of HSV-1. The association was disrupted by treatment with 0.5% sodium dodecyl sulfate, but resistant to the treatment with 1% NP-40 plus 1% deoxycholate. These results suggest that: 1) VAP21 is not primarily associated with the viral transmembrane glycoprotein but rather with the internal viral protein, and, 2) this association would cause the efficient incorporation of VAP21 into the virion.
authors.affiliation: Department of Molecular Microbiology, Graduate School of Pharmaceutical Sciences, Kyoto University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: T S
authors.initials: TS
authors.lastname: Tochikura
authors.forename: S
authors.initials: S
authors.lastname: Xiao
authors.forename: A
authors.initials: A
authors.lastname: Sakurai
authors.forename: A
authors.initials: A
authors.lastname: Kawai
mesh_terms: D002478:Cells, Cultured; D004267:DNA Viruses / Q000502:physiology*; D018259:Herpesvirus 1, Human / Q000502:physiology; D008565:Membrane Proteins / Q000378:metabolism*; D011485:Protein Binding; D012328:RNA Viruses / Q000502:physiology*; D011820:Rabies virus / Q000502:physiology; D012845:Sindbis Virus / Q000502:physiology; D013045:Species Specificity; D014616:Vaccinia virus / Q000502:physiology; D014721:Vesicular stomatitis Indiana virus / Q000502:physiology; D014764:Viral Proteins / Q000378:metabolism*; D019065:Virus Assembly
chemical_list: D008565:Membrane Proteins; C113732:VAP21 protein, Rabies virus; D014764:Viral Proteins