Nonnatural interactions: The X-ray crystal structure of a mutant aminoacyl-tRNA synthetase that selectively recognizes para-benozyl-L-phenylalanine has been solved. This structure shows that mutations to the enzyme lead to new hydrophobic binding interactions with the unnatural amino acid, and a loss of specific hydrogen-bonding interactions with tyrosine, without a significant change in the polypeptide backbone conformation.
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Liu et al. (2007) studied this question.
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