title: In trans interaction of hepatitis C virus helicase domains mediates protease activity critical for internal NS3 cleavage and cell transformation.
abstract: Hepatitis C virus (HCV) internal non-structural protein 3 (NS3) cleavage can occur in trans in the presence of NS4A. In this study, we have further demonstrated a critical role of the helicase domain in the internal NS3 cleavage, different from HCV polyprotein processing which requires only the serine protease domain. The NTPase domain of NS3 helicase interacts with the RNA binding domain to facilitate internal NS3 cleavage. In addition, NS3 protease activity contributes to the transforming ability of the major internal cleavage product NS3(1-402). These findings imply important roles of the internal cleavage and protease activity of the NS3 protein in the pathogenesis of HCV.
authors: Institute of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan.
authors: Ren-You
authors: RY
authors: Pan
authors: Tzu-Min
authors: TM
authors: Hung
authors: Yi-Hen
authors: YH
authors: Kou
authors: Nei-Li
authors: NL
authors: Chan
authors: Ming-Fu
authors: MF
authors: Chang
authors: Shin C
authors: SC
authors: Chang
mesh_terms: D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D045744:Cell Line, Tumor; D016174:Hepacivirus / Q000201:enzymology* / Q000235:genetics; D006801:Humans; D051379:Mice; D041681:NIH 3T3 Cells; D020815:Polyproteins / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary / Q000235:genetics / Q000502:physiology; D020365:RNA Helicases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D057057:Serine Proteases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017361:Viral Nonstructural Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D012697:Serine Endopeptidases; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases
chemical_list: D020815:Polyproteins; D020365:RNA Helicases; D057057:Serine Proteases; D017361:Viral Nonstructural Proteins; C084422:NS3 protein, hepatitis C virus; D012697:Serine Endopeptidases; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases