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Production of hepatitis C virus (HCV) core protein requires the cleavages of polyprotein by signal peptidase and signal peptide peptidase (SPP). Cleavage of signal peptide at the C-terminus of HCV core protein by SPP was characterized in this study. The spko mutant (mutate a.a. 189–193 from ASAYQ to PPFPF) is more efficient than the A/F mutant (mutate a.a 189 and 191 from A to F) in blocking the cleavage...