Abstract
To investigate the recognition mechanism of tryptophan tRNA by tryptophanyl-tRNA synthetase from extreme hyperthermophilic and aerobic archaeon, Aeropyrum pernix K1, tryptophanylation activities were examined by using mutant tryptophan tRNA transcripts prepared by in vitro transcription system. Their transcripts were aminoacylated with tryptophan by overexpressed A. pernix tryptophanyl-tRNA synthetase. The results indicated that anticodon nucleotides C34, C35 and A36, discriminator base A73, G1-C72 and G2-C71 base pairs of acceptor stem were base-specifically recognized by A. pernix tryptophanyl-tRNA synthetase.
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