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The core of Escherichia coli tRNACys is important for aminoacylation of the tRNA by cysteine-tRNA synthetase. This core differs from the common tRNA core by having a G15:G48, rather than a G15:C48 base-pair. Substitution of G15:G48 with G15:C48 decreases the catalytic efficiency of aminoacylation by two orders of magnitude. This indicates that the design of the core is not compatible with G15:C48...
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