title: Detection of cellular receptors specific for the hepatitis B virus preS surface protein on cell lines of extrahepatic origin.
abstract: Hepatitis B virus infection is primarily mediated by the interaction of the preS region of the viral envelope protein with its still unknown cellular receptor. Using recombinantly expressed preS proteins, the distribution of preS-binding receptors on cell lines from extrahepatic origins was determined by immunofluorescence and flow cytometry. In contrast to human liver cell lines, most cell lines from extrahepatic origins did not bind preS proteins. Nevertheless, exceptions were found in the bone marrow-derived cell line, KG-1, and the osteogenic sarcoma cell line SaOS-2, as well as in the previously reported EBV-transformed B-cell line, Wa. To determine the biochemical nature of these receptors, Wa-cells were cell surface biotinylated and the preS-binding receptors were isolated by immunoprecipitation. A specific band with a molecular weight of approximately 30 kDa was identified in a SDS-polyacrylamide gel, which further characterization is expected to provide clues regarding the infection mechanism of HBV in hepatic- and extra-hepatic cells.
authors.affiliation: Protein Engineering Laboratory, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Yusong, Taejon, 305-600, South Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Park
authors.forename: E A
authors.initials: EA
authors.lastname: Choi
authors.forename: E W
authors.initials: EW
authors.lastname: Cho
authors.forename: Y J
authors.initials: YJ
authors.lastname: Lee
authors.forename: J M
authors.initials: JM
authors.lastname: Park
authors.forename: S Y
authors.initials: SY
authors.lastname: Na
authors.forename: K L
authors.initials: KL
authors.lastname: Kim
mesh_terms: D019921:Biotinylation; D002460:Cell Line; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D006514:Hepatitis B Surface Antigens / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D006515:Hepatitis B virus; D022781:Hepatocytes / Q000378:metabolism; D006801:Humans; D008970:Molecular Weight; D009928:Organ Specificity; D011233:Precipitin Tests; D011485:Protein Binding; D011498:Protein Precursors / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D011991:Receptors, Virus / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism; D013379:Substrate Specificity; D014407:Tumor Cells, Cultured; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000378:metabolism*
chemical_list: D006514:Hepatitis B Surface Antigens; D011498:Protein Precursors; D011991:Receptors, Virus; D011993:Recombinant Fusion Proteins; D014759:Viral Envelope Proteins; C050806:presurface protein 1, hepatitis B surface antigen; C050807:presurface protein 2, hepatitis B surface antigen