作者:Denia Mellal、Matthieu Fonvielle、Marco Santarem、Maryline Chemama、Yoann Schneider、Laura Iannazzo、Emmanuelle Braud、Michel Arthur、Mélanie Etheve-Quelquejeu
DOI:10.1039/c3ob41206g
日期:——
Aminoacyl-tRNAs serve as amino acid donors in many reactions in addition to protein synthesis by the ribosome, including synthesis of the peptidoglycan network in the cell wall of bacterial pathogens. Synthesis of analogs of aminoacylated tRNAs is critical to further improve the mechanism of these reactions. Here we have described the synthesis of two non-isomerizable analogues of Ala-tRNAAla containing an amide bond instead of the isomerizable ester that connects the amino acid with the terminal adenosine in the natural substrate. The non-isomerizable 2′ and 3′ regioisomers were not used as substrates by FemXWv, an alanyl-transferase essential for peptidoglycan synthesis, but inhibited this enzyme with IC50 of 5.8 and 5.5 μM, respectively.
除了通过核糖体合成蛋白质外,氨基酰-tRNA 还在许多反应中充当氨基酸供体,包括合成细菌病原体细胞壁中的肽聚糖网络。合成氨基酰化 tRNA 的类似物对于进一步改善这些反应的机理至关重要。在这里,我们介绍了两种不可异构的 Ala-tRNAAla 类似物的合成,它们含有一个酰胺键,而不是天然底物中连接氨基酸与末端腺苷的可异构酯。这种不可异构的 2′和 3′区域异构体不被肽聚糖合成所必需的丙氨酰转移酶 FemXWv 用作底物,但对该酶有抑制作用,IC50 分别为 5.8 和 5.5 μM。