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Target intelligence / Profile preview
Hepatitis C virus non-structural protein 3 (NS3)
- Target
- NS3
- Molecular classification
- Enzyme, Viral protease, Helicase, Nucleoside triphosphatase
01
Overview
Hepatitis C virus non-structural protein 3 (NS3) is a 70 kDa multifunctional enzyme produced by cleavage of the HCV polyprotein. It has two main functional domains: an N-terminal serine protease (involved in processing the viral polyprotein into mature non-structural proteins) and a C-terminal helicase/nucleoside triphosphatase (critical for viral RNA replication). The protease domain requires a cofactor, NS4A, for full activity. NS3 is an essential component of the HCV replication complex and a validated target for several clinically used direct-acting antiviral drugs. Its proper function is necessary for the life cycle of the hepatitis C virus, making it a central therapeutic target in HCV infection management.
- Other names
- NS3p-70HCV NS3hepatitis C virus NS3 protease
02
Mechanism of action
Inhibition of NS3 serine protease activity, which disrupts viral polyprotein processing and prevents formation of the HCV replication complex
03
Biological functions
Proteolytic processing of the viral polyproteinRNA replication (through helicase activity)Cleavage of non-structural protein junctions in HCV polyproteinCofactor for NS2 protease
04
Disease associations
Infection (specifically chronic hepatitis C and related liver diseases such as cirrhosis and hepatocellular carcinoma)
05
Safety considerations
Resistance to protease inhibitors can develop due to viral mutationsPotential for drug interactions when used in combination antiviral therapyAdverse events related to off-target effects are possible but generally less common for direct-acting antivirals targeting NS3 versus host targets
06
Interacting drugs
Boceprevir
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