Abstract:A gene encoding the 3BC of human enterovirus 71 (EV71) was cloned and inserted into a derivative of plasmid pET-32a(+) driven by T7 promoter. The expressed 3C protease (3C(pro)) autocatalytically cleaved itself from the recombinant protein Trx-3BC and the mature 3C(pro) partitioned in the soluble fraction of bacterial lysate. The 13-amino-acid peptide substrates with the junction of 3B/3C were used to verify the proteolysis activity of the purified 3C(pro). The EV71 3C(pro) had a Km value of 63 μM (measured by… Show more
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