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).
自然选择:用3'-H影响的FemX Wv催化的
氨基酰基从2'-位转移来取代Ala-tRNA Ala的3'-OH基团,但不影响底物结合。FemX Wv结合并通过丙
氨酰tRNA合成酶(AlaRS)最初形成的3'-O-Ala异构体的能力可能对与
核糖体的有效竞争至关重要(请参阅方案)。