title: Two proteinase activities in HCV polypeptide expressed in insect cells using baculovirus vector.
abstract: Processing of HCV viral precursor protein requires at least two viral proteinases, Cpro-1 and Cpro-2, in addition to cellular proteinases. The HCV polypeptide that covers the region for the two viral proteinase domains was expressed in insect cells using a baculovirus expression system. The two proteinase activities were demonstrated in the infected cells. The Cpro-1-dependent cleavage site was estimated from the amino acid sequence of the N-terminus of the processed product. Analyses of the susceptibilities of various mutants altered at position P1 and P1' of the putative cleavage site suggested that amino acid residues at these positions is not essential for recognition and cleavage by Cpro-1-dependent activity.
authors.affiliation: Virology Division, National Cancer Center Research Institute, Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hirowatari
authors.forename: M
authors.initials: M
authors.lastname: Hijikata
authors.forename: Y
authors.initials: Y
authors.lastname: Tanji
authors.forename: H
authors.initials: H
authors.lastname: Nyunoya
authors.forename: H
authors.initials: H
authors.lastname: Mizushima
authors.forename: K
authors.initials: K
authors.lastname: Kimura
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: N
authors.initials: N
authors.lastname: Kato
authors.forename: K
authors.initials: K
authors.lastname: Shimotohno
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D016367:Baculoviridae / Q000235:genetics; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004252:DNA Mutational Analysis; D004591:Electrophoresis, Polyacrylamide Gel; D010450:Endopeptidases / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D015967:Gene Expression Regulation, Viral; D005814:Genes, Viral; D005822:Genetic Vectors; D016174:Hepacivirus / Q000201:enzymology* / Q000235:genetics; D007313:Insecta; D008969:Molecular Sequence Data; D010957:Plasmids; D011498:Protein Precursors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; 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: D010450:Endopeptidases; D011498:Protein Precursors; D011994:Recombinant Proteins; D017361:Viral Nonstructural Proteins; C084422:NS3 protein, hepatitis C virus; D012697:Serine Endopeptidases; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases; C084815:proteinase Cpro-1, hepatitis C virus; C084816:proteinase Cpro-2, hepatitis C virus