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- W2096352001 abstract "The hepatitis C virus (HCV) NS3 protein possesses both protease and helicase activities and is essential for virus replication and maturation. Specific inhibition of NS3 enzymatic activity can be achieved by antibody binding. Transduction of hepatocytes with encoding cDNA leading to intracellular expression of antibody fragments is expected to terminate HCV replication in infected cells. The objective of the present study was the generation of human antibody fragments that neutralize the viral NS3 helicase activity for gene therapeutic applications and drug design. A human immunoglobulin phage-display library cloned from bone marrow aspirate of patients infected with HCV was used for affinity selection against HCV NS3 helicase. Antibody fragments with high affinity to HCV helicase were isolated. To evaluate the inhibitory potential of isolated single-chain antibody fragments, a helicase-mediated, DNA-unwinding enzymatic assay was developed in ELISA format. Recombinant protein comprising the full-length HCV NS3 helicase domain was expressed in the baculovirus expression system. Recombinant antibodies that inhibit the HCV helicase at nanomolar concentrations, with efficacies ranging from 20 % to complete abrogation of enzymatic unwinding activity, were identified. These antibody fragments may be useful for novel gene therapeutic strategies that employ intracellular immunization and may provide new insights into the design of small molecule inhibitors of essential HCV proteins." @default.
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- W2096352001 date "2003-09-01" @default.
- W2096352001 modified "2023-09-23" @default.
- W2096352001 title "Abrogation of hepatitis C virus NS3 helicase enzymatic activity by recombinant human antibodies" @default.
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- W2096352001 doi "https://doi.org/10.1099/vir.0.19299-0" @default.
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