title: Hepatitis C virus 3'UTR regulates viral translation through direct interactions with the host translation machinery.
abstract: The 3' untranslated region (3'UTR) of hepatitis C virus (HCV) messenger RNA stimulates viral translation by an undetermined mechanism. We identified a high affinity interaction, conserved among different HCV genotypes, between the HCV 3'UTR and the host ribosome. The 3'UTR interacts with 40S ribosomal subunit proteins residing primarily in a localized region on the 40S solvent-accessible surface near the messenger RNA entry and exit sites. This region partially overlaps with the site where the HCV internal ribosome entry site was found to bind, with the internal ribosome entry site-40S subunit interaction being dominant. Despite its ability to bind to 40S subunits independently, the HCV 3'UTR only stimulates translation in cis, without affecting the first round translation rate. These observations support a model in which the HCV 3'UTR retains ribosome complexes during translation termination to facilitate efficient initiation of subsequent rounds of translation.
authors.affiliation: Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA, Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, USA, Department of Chemistry, University of California, Berkeley, CA 94720, USA and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Yun
authors.initials: Y
authors.lastname: Bai
authors.forename: Kaihong
authors.initials: K
authors.lastname: Zhou
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Doudna
mesh_terms: D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D045744:Cell Line, Tumor; D039621:Eukaryotic Initiation Factor-3 / Q000378:metabolism; D015967:Gene Expression Regulation, Viral; D016174:Hepacivirus / Q000235:genetics*; D006801:Humans; D014176:Protein Biosynthesis; D012367:RNA, Viral / Q000737:chemistry / Q000378:metabolism; D012269:Ribosomal Proteins / Q000378:metabolism; D054682:Ribosome Subunits, Small, Eukaryotic / Q000737:chemistry / Q000821:virology
chemical_list: D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D039621:Eukaryotic Initiation Factor-3; D012367:RNA, Viral; D012269:Ribosomal Proteins