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- W61009196 abstract "Research Article3 January 1995free access Human RPB5, a subunit shared by eukaryotic nuclear RNA polymerases, binds human hepatitis B virus X protein and may play a role in X transactivation. J.H. Cheong J.H. Cheong Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author M. Yi M. Yi Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author Y. Lin Y. Lin Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author S. Murakami S. Murakami Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author J.H. Cheong J.H. Cheong Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author M. Yi M. Yi Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author Y. Lin Y. Lin Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author S. Murakami S. Murakami Department of Molecular Biology, Kanazawa University, Japan. Search for more papers by this author Author Information J.H. Cheong1, M. Yi1, Y. Lin1 and S. Murakami1 1Department of Molecular Biology, Kanazawa University, Japan. The EMBO Journal (1995)14:143-150https://doi.org/10.1002/j.1460-2075.1995.tb06984.x PDFDownload PDF of article text and main figures. ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InMendeleyWechatReddit Figures & Info The X gene of human hepatitis B virus encodes the polypeptide HBx which transactivates viral and host genes through a variety of cis-acting enhancer elements present in RNA polymerases I, II and III promoters. To better understand the mechanism of X transactivation, we cloned cDNAs of proteins that bind HBx. Here we demonstrate that one of these cDNAs is a full-length cDNA of human RPB5, a subunit shared by RNA polymerases. The HBx transactivation domain and the central region of human RPB5 were necessary for the specific binding of the two proteins as shown by: (i) in vitro assays using deletion mutants of fusion proteins; (ii) in vivo assays which detect associated proteins by co-immunoprecipitation of the non-fused proteins from transfected HepG2 cells. Over-expressed HBx seemed to associate with assembled forms of endogenous human RPB5 in HBx-transfected cells, since the endogenous RPB5 co-immunoprecipitated with HBx. The HBx binding region of human RPB5 by itself stimulated chloramphenicol acetyltransferase activities from several different reporters having X-responsive element(s). Our results support the idea that the interaction of HBx and human RPB5 can facilitate HBx transactivation and that human RPB5 has a domain which can communicate with transcriptional regulators. Previous ArticleNext Article Volume 14Issue 11 January 1995In this issue RelatedDetailsLoading ..." @default.
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- W61009196 title "Human RPB5, a subunit shared by eukaryotic nuclear RNA polymerases, binds human hepatitis B virus X protein and may play a role in X transactivation." @default.
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