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J. Virol., Dec 1996, 8444-8450, Vol 70, No. 12
Copyright © 1996, American Society for Microbiology

The eIF4G-eIF4E complex is the target for direct cleavage by the rhinovirus 2A proteinase

A Haghighat, Y Svitkin, I Novoa, E Kuechler, T Skern and N Sonenberg
Department of Biochemistry, Faculty of Medicine, McGill University, Montreal, Quebec, Canada.

The 2A proteinases (2Apro) of certain picornaviruses induce the cleavage of the eIF4G subunit of the cap-binding protein complex, eIF4F. Several reports have demonstrated that 2Apro of rhinovirus and coxsackievirus B4 cleave eIF4G directly. However, it was suggested that in poliovirus infection, the 2Apro induces the activation of a cellular proteinase which in turn cleaves eIF4G. Furthermore, it is not clear whether eIF4G is cleaved as part of the eIF4F complex or as an individual polypeptide. To address these issues, recombinant eIF4G was purified from Sf9 insect cells and tested for cleavage by purified rhinovirus 2Apro. Here we report that eIF4G alone is a relatively poor substrate for cleavage by the rhinovirus 2Apro. However, an eIF4G-eIF4E complex is cleaved efficiently by the 2Apro, suggesting that eIF4F is a preferred substrate for cleavage by rhinovirus 2Apro. Furthermore, 2Apr drastically reduced the translation of a capped mRNA. An eIF4G-eIF4E complex, but not eIF4G alone, was required to restore translation.

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