Search results for "ns3"

showing 3 items of 23 documents

New developments in the management of hepatitis C virus infection: focus on boceprevir

2012

Chronic hepatitis C virus infection is an important public health problem, and the standard treatment (combination of pegylated interferon-α and ribavirin) has an effectiveness rate of only 40%-50%. Novel virus-specific drugs have recently been designed, and multiple compounds are under development. The approval for the clinical use of direct-acting antivirals in 2011 (boceprevir [BOC] and telaprevir, viral NS3 protease inhibitors) has increased recovery rates by up to 70%. Therefore, a highly effective treatment has been envisioned for the first time. This paper focuses on BOC and the implementation of new BOC-based treatment regimes.

viral resistanceNS3business.industryvirusesRibavirinHepatitis C virusStandard treatmentprotease inhibitorsReviewmedicine.disease_causeVirologyVirusTelaprevirchemistry.chemical_compoundchemistryBoceprevirHCVantiviral therapyMedicineEffective treatmentbusinessmedicine.drugBiologics: Targets and Therapy
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Modulation of Hepatitis C Virus NS5A Hyperphosphorylation by Nonstructural Proteins NS3, NS4A, and NS4B

1999

NS5A of the hepatitis C virus (HCV) is a highly phosphorylated protein involved in resistance against interferon and required most likely for replication of the viral genome. Phosphorylation of this protein is mediated by a cellular kinase(s) generating multiple proteins with different electrophoretic mobilities. In the case of the genotype 1b isolate HCV-J, in addition to the basal phosphorylated NS5A (designated pp56), a hyperphosphorylated form (pp58) was found on coexpression of NS4A (T. Kaneko, Y. Tanji, S. Satoh, M. Hijikata, S. Asabe, K. Kimura, and K. Shimotohno, Biochem. Biophys. Res. Commun. 205:320‐326, 1994). Using a comparative analysis of two full-length genomes of genotype 1b…

virusesHepatitis C virusHepacivirusMolecular Sequence DataImmunologyGene ExpressionReplicationHyperphosphorylationGenome ViralHepacivirusViral Nonstructural Proteinsmedicine.disease_causeMicrobiologyCell LineInterferonCricetinaeVirologymedicineAnimalsHumansPhosphorylationNS5ANS3Base SequencebiologyPestivirusvirus diseasesRNAbiochemical phenomena metabolism and nutritionbiology.organism_classificationVirologyMolecular biologydigestive system diseasesAmino Acid SubstitutionInsect ScienceDNA Viralmedicine.drugJournal of Virology
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In vitro studies on the activation of the hepatitis C virus NS3 proteinase by the NS4A cofactor.

1996

AbstractProteolytic processing of the nonstructural proteins of the hepatitis C virus (HCV) is mediated by two viral proteinases: the NS2-3 proteinase cleaving at the NS2/3 junction and the NS3 serine-type proteinase responsible for processing at the NS3/4A, NS4A/B, NS4B/5A, and NS5A/B sites. Activity of the NS3 proteinase is modulated by NS4A. In the absence of this cofactor processing at the NS3-dependent sites does not occur or, in the case of the NS5A/B junction, is poor but increased when NS4A is present. Although recent studies demonstrated that proteinase activation requires direct interaction between NS3 and NS4A, the mechanism by which NS4A exerts the activation function is not kno…

virusesMolecular Sequence DataHepacivirusBiologyViral Nonstructural ProteinsCell LineEnzyme activatorProteinase 3VirologyCricetinaeMicrosomesAnimalsHumansAmino Acid SequenceBinding siteNS5APeptide sequenceSequence Deletionchemistry.chemical_classificationNS3Binding SitesBase Sequencevirus diseasesIntracellular Membranesbiochemical phenomena metabolism and nutritionMolecular biologyIn vitrodigestive system diseasesAmino acidEnzyme ActivationBiochemistrychemistryDNA ViralPeptidesHeLa CellsVirology
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