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Transfer of alanine from Escherichia coli alanyl-tRNA synthetase (AlaRS) to RNA minihelices that mimic the amino acid acceptor stem of tRNA(Ala) has been shown, by analysis of variant minihelix aminoacylation activities, to involve a transition state sensitive to changes in the 'discriminator' base at position 73. Solution NMR has indicated that this(More)
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