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The discriminator base N73 is a key identity element of tRNAHis. In eukaryotes, N73 is an “A” in cytoplasmic tRNAHis and a “C” in mitochondrial tRNAHis. We present evidence herein that yeast histidyl-tRNA synthetase (HisRS) recognizes both A73 and C73, but somewhat prefers A73 even within the context of mitochondrial tRNAHis. In contrast, humans possess two distinct yet closely related HisRS homologues,...
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