title: Characterization of hepatitis B virus X gene: in vitro translation of mRNA from COS-1 cells transfected with the X gene.
abstract: To elucidate the biological role of the X region of HBV DNA, we constructed an expression plasmid pSV2HBx by inserting the StuI/BglII fragment of HBV DNA into the pSV2 vector. Although X region products were not identified in vivo in transfected COS-1 cells, transcripts were translated in vitro and a 17-k Da protein was immunoprecipitated with an antibody raised against a synthetic peptide corresponding to the carboxy terminus of the X region open reading frame. Among 68 HBV carrier sera tested, two were found to contain antibodies reactive to the in vitro translation product. These results suggest that the X region is a gene which can be actually expressed at some stage of HBV infection.
authors.affiliation: Department of Enteroviruses, National Institute of Health, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Koike
authors.forename: T
authors.initials: T
authors.lastname: Akatsuka
authors.forename: T
authors.initials: T
authors.lastname: Miyamura
mesh_terms: D000818:Animals; D002460:Cell Line; D005814:Genes, Viral; D006515:Hepatitis B virus / Q000235:genetics*; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics*; D012367:RNA, Viral / Q000235:genetics; D014162:Transfection; D014764:Viral Proteins / Q000096:biosynthesis / Q000235:genetics
chemical_list: D012333:RNA, Messenger; D012367:RNA, Viral; D014764:Viral Proteins