Abstract
Terminally oxidized-reduced tRNA(Phe) of yeast, exclusively acylated at the 2'-hydroxyl of the 3'-terminal ribose of the tRNA, is a useful model for investigating the stereospecificity of AA-tRNA in protein synthesis. In this work, the ability of N-acetyl-Phe-tRNA(ox-red) to form an initiation complex with Escherichiacoli 30S ribosomal subunits was investigated. Thirty per cent of added control N-acetyl-Phe-tRNA was bound in a reaction dependent on initiation factors, GTP, and poly U, but no binding of the oxidized-reduced analog could be detected. These results imply that initiation complex formation may be specific for the 3'-ester of initiator tRNA.
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