IUBMB Enzyme Nomenclature


Accepted name: hepacivirin

Reaction: Hydrolysis of four peptide bonds in the viral precursor polyprotein, commonly with Asp or Glu in the P6 position, Cys or Thr in P1 and Ser or Ala in P1'

Other names: Cpro-2; hepatitis C virus NS3 serine proteinase; NS3-4A serine proteinase complex

Comments: Encoded by the genome of the viruses of the hepatitis C group, and contributes to the maturation of the precursor polyproteins. The enzyme is greatly activated by binding of the 54-residue NS4A 'cofactor' protein also derived from the viral polyprotein. Type example of peptidase family S29. The crystallographic structure shows a chymotrypsin-like fold

Links to other databases: BRENDA, EXPASY, KEGG, MEROPS, Metacyc, PDB, CAS registry number: 149885-80-3


1. Kim, J.L., Morgenstern, K.A., Lin, C., Fox, T., Dwyer, M.D., Landro, J.A., Chambers, S.P., Markland, W., Lepre, C.A., O'Malley, E.T., Harbeson, S.L., Rice, C.M., Murcko, M.A., Caron, P.R. and Thomson, J.A. Crystal structure of the hepatitis C virus NS3 protease domain complexed with a synthetic NS4A cofactor peptide. Cell 87 (1996) 343-355. [PMID: 8861917]

2. Rice, C.M. Hepatitis C virus polyprotein peptidase. In: : Handbook of Proteolytic Enzymes (Barrett, A.J., Rawlings, N.D. and Woessner, J.F. eds), pp. 272-277 (1998) Academic Press, London

[EC created 2000]

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