1887

Abstract

The replication of coronaviruses involves proteolytic processing of the gene 1 translation products, pp1a and pp1ab. One of the key enzymes in this process is predicted to be a virus-encoded 3C-like proteinase. In this report, we describe a bacterial system that has allowed us to express and characterize a recombinant murine coronavirus (MHV- JHM) 3C-like proteinase. The partially purified protein has been shown to exhibit proteolytic activity in and mutation analysis has been used to demonstrate the indispensability of Cys- 3495 for enzymatic activity. Finally, the effect of class-specific proteinase inhibitors on the cleavage activity of the MHV 3C-like proteinase has been used to demonstrate the functional and structural homology of this enzyme to the picorna- virus 3C proteinases.

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1997-01-01
2022-05-28
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