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The yeast two-hybrid system has been used to identify mammalian clones that interact with poliovirus 2A proteinase (2Apro ). Eight clones which encode previously unidentified human proteins were selected from a HeLa cell cDNA expression library. In addition, five clones encoding short peptides that interact with poliovirus 2Apro were also identified. The lengths of these peptides range from 6 to 30 amino acids, but all of them contain the Leu-X-Thr-Z motif (X represents any amino acid; Z represents a hydrophobic residue). This sequence is invariably located just at the carboxy terminus of each peptide. This approach raises the possibility of designing substrate analogue inhibitors of 2Apro . Thus, two nonhydrolyzable peptides containing the Leu-X-Thr-Z motif prevented cleavage of eukaryotic initiation factor 4G by poliovirus 2Apro in vitro. A more general method for identifying peptides with antiproteinase activity is discussed.

Genetic Selection of Poliovirus 2A pro -Binding Peptides

Genetic Selection of Poliovirus 2A ^pro -Binding Peptides