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J Gen Virol 78 (1997), 13-21
© 1997 Society for General Microbiology
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Journal of General Virology, Vol 78, 13-21, Copyright © 1997 by Society for General Microbiology

ARTICLES

The cleavage activities of aphthovirus and cardiovirus 2A proteins

ML Donnelly, D Gani, M Flint, S Monaghan and MD Ryan
School of Chemistry, University of St Andrews, UK.

The primary 2A/2B polyprotein cleavage of aphtho-and cardioviruses is mediated by their 2A proteins cleaving C-terminally. Whilst the aphthovirus 2A region is only 16 aa (possibly 18 aa) long, the cardiovirus 2A protein is some 150 aa. We have previously shown that foot-and-mouth disease virus (FMDV) 2A is able to mediate cleavage in an artificial (chloramphenicol acetyltransferase/FMDV 2A/beta- glucuronidase [CAT-2A-GUS]) polyprotein system devoid of any other FMDV sequences with high (approximately 85%), although not complete, cleavage. In this paper we show that insertion of upstream FMDV capsid protein 1 D sequences increases the activity. In addition, we have demonstrated that the cardiovirus Theiler's murine encephalomyelitis virus(TME) 2A protein, when linked to GUS in a single ORF, is able to cleave at its own C terminus with high efficiency--if not completely. The C-terminal 19 aa of TME 2A, together with the N-terminal proline residue of protein 2B, were inserted into the CAT/GUS artificial polyprotein system (in a single ORF). This recombinant [CAT-deltaTME2A- GUS] polyprotein was able to mediate cleavage with high (approximately 85%) efficiency--directly comparable to the activity observed when FMDV 2A was inserted. A similar insertion into [CAT-GUS] of the C-terminal 19 aa of the cardiovirus encephalomyocarditis virus (EMC) 2A, together with the N-terminal proline residue of protein 2B, produced a [CAT- delta EMC2A-GUS] polyprotein which also mediated cleavage at approximately 85%. Analysis of the products of expression of these artificial polyproteins in a prokaryotic translation system did not, apparently, reveal any GUS cleavage product.


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