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Journal of Virology, November 2001, p. 10643-10650, Vol. 75, No. 22
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.22.10643-10650.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

An Attenuating Mutation in the 2A Protease of Swine Vesicular Disease Virus, a Picornavirus, Regulates Cap- and Internal Ribosome Entry Site-Dependent Protein Synthesis

Yoshihiro Sakoda,1 Natalie Ross-Smith,2 Toru Inoue,1 and Graham J. Belsham2,*

Department of Exotic Disease, National Institute of Animal Health, Kodaira, Tokyo 187-0022, Japan,1 and BBSRC Institute for Animal Health, Pirbright, Woking, Surrey GU24 ONF, United Kingdom2

Received 30 April 2001/Accepted 13 August 2001

Virulent and avirulent strains of swine vesicular disease virus (SVDV), a picornavirus, have been characterized previously. The major determinants for attenuation have been mapped to specific residues in the 1D-2A-coding region. The properties of the 2A proteases from the virulent and avirulent strains of SVDV have now been examined. Both proteases efficiently cleaved the 1D/2A junction in vitro and in vivo. However, the 2A protease of the avirulent strain of SVDV was much less effective than the virulent-virus 2A protease at inducing cleavage of translation initiation factor eIF4GI within transfected cells. Hence the virulent-virus 2A protease is much more effective at inhibiting cap-dependent protein synthesis. Furthermore, the virulent-virus 2A protease strongly stimulated the internal ribosome entry sites (IRESs) from coxsackievirus B4 and from SVDV, while the avirulent-virus 2A protease was significantly less active in these assays. Thus, the different properties of the 2A proteases from the virulent and avirulent strains of SVDV in regulating protein synthesis initiation reflect the distinct pathogenic properties of the viruses from which they are derived. A single amino acid substitution, adjacent to His21 of the catalytic triad, is sufficient to confer the characteristics of the virulent-strain 2A protease on the avirulent-strain protease. It is concluded that the efficiency of picornavirus protein synthesis, controlled directly by the IRES or indirectly by the 2A protease, can determine virus virulence.

* Corresponding author. Mailing address: BBSRC Institute for Animal Health, Pirbright, Woking, Surrey GU24 ONF, United Kingdom. Phone: 44 (0)1483 232441. Fax: 44 (0)1483 232448. E-mail: graham.belsham{at}bbsrc.ac.uk.

Journal of Virology, November 2001, p. 10643-10650, Vol. 75, No. 22
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.22.10643-10650.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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