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Natural selection: Replacement of the 3′‐OH group of Ala‐tRNAAla with 3′‐H affected FemXWv‐catalyzed aminoacyl transfer from the 2′‐position, but not substrate binding. The ability of FemXWv to bind and transacylate the 3′‐O‐Ala isomer initially formed by alanyl‐tRNA synthetase (AlaRS) may be crucial for efficient competition with the ribosome (see scheme).
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