title: Hepatitis B virus X protein in the proteasome of mammalian cells: defining the targeting domain.
abstract: The hepatitis B virus X (HBX) protein has been implicated in both hepatitis B virus-related pathogenesis and also in diverse cellular processes. The diversity of its activities may be mediated through its interaction with cellular organelles. However no clearly defined subcellular localization of HBX is available. We report here the localization of HBX in the proteasome complexes using green fluorescent protein tag. A new proteasome-targeting domain has also been defined in HBX by deletion study. Furthermore, a functional role of HBX in the cellular processes mediated by the proteasome complexes has been suggested by its cell cycle-independent localization in the proteasome. Further analysis of the functional role of HBX in the proteasome complexes should provide more information on the underlying mechanism of HBX ativities.
authors.affiliation: Department of Clinical Research, Singapore General Hospital, Republic of Singapore.
authors.forename: W N
authors.initials: WN
authors.lastname: Chen
authors.forename: C J
authors.initials: CJ
authors.lastname: Oon
authors.forename: K S
authors.initials: KS
authors.lastname: Goo
mesh_terms: D000818:Animals; D006528:Carcinoma, Hepatocellular; D002453:Cell Cycle; D003546:Cysteine Endopeptidases / Q000378:metabolism*; D049452:Green Fluorescent Proteins; D006801:Humans; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D008322:Mammals; D009097:Multienzyme Complexes / Q000378:metabolism*; D046988:Proteasome Endopeptidase Complex; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017384:Sequence Deletion; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D054334:Viral Regulatory and Accessory Proteins
chemical_list: D008164:Luminescent Proteins; D009097:Multienzyme Complexes; D011994:Recombinant Proteins; D015534:Trans-Activators; D054334:Viral Regulatory and Accessory Proteins; C057628:hepatitis B virus X protein; D049452:Green Fluorescent Proteins; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex