title: A human nuclear shuttling protein that interacts with human immunodeficiency virus type 1 matrix is packaged into virions.
abstract: Active nuclear import of the human immunodeficiency virus type 1 (HIV-1) preintegration complex (PIC) is essential for the productive infection of nondividing cells. Nuclear import of the PIC is mediated by the HIV-1 matrix protein, which also plays several critical roles during viral entry and possibly during virion production facilitating the export of Pr55(Gag) and genomic RNA. Using a yeast two-hybrid screen, we identified a novel human virion-associated matrix-interacting protein (VAN) that is highly conserved in vertebrates and expressed in most human tissues. Its expression is upregulated upon activation of CD4(+) T cells. VAN is efficiently incorporated into HIV-1 virions and, like matrix, shuttles between the nucleus and cytoplasm. Furthermore, overexpression of VAN significantly inhibits HIV-1 replication in tissue culture. We propose that VAN regulates matrix nuclear localization and, by extension, both nuclear import of the PIC and export of Pr55(Gag) and viral genomic RNA during virion production. Our data suggest that this regulatory mechanism reflects a more global process for regulation of nucleocytoplasmic transport.
authors.affiliation: Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
authors.forename: K
authors.initials: K
authors.lastname: Gupta
authors.forename: D
authors.initials: D
authors.lastname: Ott
authors.forename: T J
authors.initials: TJ
authors.lastname: Hope
authors.forename: R F
authors.initials: RF
authors.lastname: Siliciano
authors.forename: J D
authors.initials: JD
authors.lastname: Boeke
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000821:virology*; D000595:Amino Acid Sequence; D001692:Biological Transport; D015683:Gene Products, gag / Q000502:physiology*; D015488:HIV Antigens / Q000502:physiology*; D015497:HIV-1 / Q000502:physiology*; D006801:Humans; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000502:physiology*; D016415:Sequence Alignment; D014764:Viral Proteins; D014771:Virion / Q000502:physiology*; D014779:Virus Replication; D054301:gag Gene Products, Human Immunodeficiency Virus
chemical_list: D015683:Gene Products, gag; D015488:HIV Antigens; D009687:Nuclear Proteins; D014764:Viral Proteins; D054301:gag Gene Products, Human Immunodeficiency Virus; C054858:p17 protein, Human Immunodeficiency Virus Type 1