It is generally believed that only L-amino acids are acceptable in protein synthesis, though some D-amino acids, including D-tyrosine, D-aspartate, and D-tryptophan are known to be bound enzymatically to tRNAs. In this report, we newly show that D-histidine and D-lysine are also able to be the substrates of respective Escherichia coli aminoacyl-tRNA synthetases.
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