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Insights into the post-translational methylation of arginine from studies of guanidinium-water nanodroplets

机译:从胍盐-水纳米液滴的研究中洞悉精氨酸的翻译后甲基化

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摘要

Highly solvated methylated guanidinium ions ([Me(n)Guan(H2O)(m)](+); n=0-4 and 6; m=1-> 50), which model the various post-translationally methylated states of arginine, were generated in the electrospray ionization (ESI) source of an unmodified commercial tandem mass spectrometer. The dehydration processes of highly solvated [Me,Guan(H2O)(21)](+) ions were monitored by using energy-dependent ESI MS. These data, together with supporting calculations, provide a detailed picture of the interplay of methylation and hydration, and both the calculations and the experimental evidence suggest a specific structural basis for the observed effects. The ramifications for biochemical binding events that are controlled by the post-translational methylation of arginine to give dimethylarginines are discussed.
机译:高度溶剂化的甲基化胍盐离子([Me(n)Guan(H2O)(m)](+); n = 0-4和6; m = 1-> 50),可模拟精氨酸的各种翻译后甲基化状态是在未经修改的商用串联质谱仪的电喷雾电离(ESI)源中生成的。通过使用能量依赖的ESI MS监测高度溶剂化的[Me,Guan(H2O)(21)](+)离子的脱水过程。这些数据与支持的计算结果一起,提供了甲基化和水合相互作用的详细情况,计算结果和实验证据均为观察到的效应提供了特定的结构基础。讨论了由精氨酸的翻译后甲基化产生二甲基精氨酸控制的生化结合事件的后果。

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