1887

Abstract

The RNA genome of (RTSV) is predicted to be expressed as a large polyprotein precursor (Shen ., 193, 621–630, 1993 ). The polyprotein is processed by at least one virus-encoded protease located adjacent to the C-terminal putative RNA polymerase which shows sequence similarity to viral serine-like proteases. The catalytic activity of this protease was explored using transcription/translation systems. Besides acting , the protease had activity on precursors containing regions of the 3′ half of the polyprotein but did not process a substrate consisting of a precursor of the coat proteins. The substitution mutation of Asp of the RTSV polyprotein had no effect on proteolysis; however, His, Glu, Cys and His proved to be essential for catalytic activity and could constitute the catalytic centre and/or substrate-binding pocket of the RTSV 3C-like protease.

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2002-12-01
2021-03-06
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