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Eukaryotic Initiation Factor 3 is Required for Poliovirus 2A Protease- Induced Cleavage of the p220 Component of Eukaryotic Initiation Factor 4F

Elizabeth E. Wyckoff, John W. B. Hershey and Ellie Ehrenfeld
Proceedings of the National Academy of Sciences of the United States of America
Vol. 87, No. 24 (Dec., 1990), pp. 9529-9533
Stable URL: http://www.jstor.org/stable/2356445
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Eukaryotic Initiation Factor 3 is Required for Poliovirus 2A Protease- Induced Cleavage of the p220 Component of Eukaryotic Initiation Factor 4F
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Abstract

After cultured cells are infected with poliovirus, cellular mRNA fails to bind to ribosomes, and synthesis of the majority of cellular proteins ceases. The defective step has been localized to the cap-dependent activity of the eukaryotic translation initiation factor 4F. Inactivation of this factor correlates with the cleavage of its largest subunit, p220, into characteristic products observed in infected cells. This cleavage is mediated by the poliovirus protease 2Apro. Previous work suggests that 2Apro does not catalyze the reaction directly, suggesting that one or more cellular proteins is required for the degradation of p220. To identify such a protein, we have developed an assay in which cleavage of a p220 substrate in the presence of poliovirus 2Apro is dependent upon the addition of HeLa cell proteins. By using this assay, we show that another factor, eukaryotic translation initiation factor 3, is required for 2Apro-dependent cleavage of p220.

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