The Hepatitis C Virus (HCV) NS3 protein contains amino acid motifs of a serine proteinase, a nucleotide triphosphatase (NTPase), and an RNA helicase. A carboxy fragment of the HCV NS3 protein was purified and possessed RNA helicase activity. Detections from the amino terminus resulted in the protein becoming soluble. Deletions from the carboxy terminus do not result in a loss of helicase activity until at least 50 amino acids are deleted. The helicase activity requires ATP and divalent cations such as Mg.sup.2+ and Mn.sup.2+. The helicase activity was blocked by monoclonal antibody specific to the HCV NS3 protein.

A proteína NS3 do vírus do hepatitis C (HCV) contem motifs do amino-ácido de um proteinase do serine, de um triphosphatase do nucleotide (NTPase), e de um helicase do RNA. Um fragmento do carboxy da proteína de HCV NS3 purified e possuiu a atividade do helicase do RNA. As deteções do amino término resultaram na proteína que torna-se soluble. Os apagamentos do término do carboxy não resultam em uma perda da atividade do helicase até que ao menos 50 aminos-ácido estejam suprimidos. A atividade do helicase requer o ATP e cations divalent tais como Mg.sup.2+ e Mn.sup.2+. A atividade do helicase foi obstruída pelo específico monoclonal do antibody à proteína de HCV NS3.

 
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