中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
5-氟尿苷5'-磷酸酯 | 5-fluorouridine 5′-monophosphate | 796-66-7 | C9H12FN2O9P | 342.174 |
Orotidine 5′-monophosphate decarboxylase has attracted intense enzymological interest, because it achieves a very large rate enhancement (∼10 17 ) without the use of cofactors. Previous studies provided evidence that substrate destabilization and vinyl anion intermediate stabilization contribute to the rate enhancement. Using in vitro translation, we generated a backbone amide to ester substitution to evaluate the importance of the hydrogen bond between a backbone amide and the substrate in intermediate stabilization. The hydrogen bond contributes modestly (≤10 2 ), suggesting that the intermediate is primarily stabilized by electrostatic interactions with the active site. This study establishes a versatile method for generation of backbone amide to ester substitutions in sufficient quantities to investigate the importance of backbone amide hydrogen bonding interactions in enzyme-catalyzed reactions.
Orotidine 5'-单磷酸脱羧酶因其实现了非常大的速率增强(约10^17)而引起了强烈的酶学兴趣,而不使用辅因子。以前的研究提供了证据,表明底物不稳定和乙烯基阴离子中间体稳定有助于速率增强。使用体外翻译,我们生成了一个骨架酰胺到酯的替换,以评估骨架酰胺和底物之间氢键在中间体稳定中的重要性。氢键对稳定中间体的贡献较小(≤10^2),这表明中间体主要通过与活性位点的静电相互作用来稳定。这项研究建立了一种多功能的方法,用于生成足够数量的骨架酰胺到酯的替换,以研究酶催化反应中骨架酰胺氢键相互作用的重要性。