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Ion-Pairing with Triethylammonium Acetate Improves Solid-Phase Extraction of ADP-Ribosylated Peptides.
Journal of Proteome Research ( IF 3.8 ) Pub Date : 2019-12-20 , DOI: 10.1021/acs.jproteome.9b00696
Robert Lyle McPherson 1 , Shao-En Ong 2 , Anthony K L Leung 1, 3, 4
Affiliation  

ADP-ribosylation refers to the post-translational modification of protein substrates with monomers or polymers of the small molecule ADP-ribose. ADP-ribosylation is enzymatically regulated and plays roles in cellular processes including DNA repair, nucleic acid metabolism, cell death, cellular stress responses, and antiviral immunity. Recent advances in the field of ADP-ribosylation have led to the development of proteomics approaches to enrich and identify endogenous ADP-ribosylated peptides by liquid chromatography tandem mass spectrometry (LC-MS/MS). A number of these methods rely on reverse-phase solid-phase extraction as a critical step in preparing cellular peptides for further enrichment steps in proteomics workflows. The anionic ion-pairing reagent trifluoroacetic acid (TFA) is typically used during reverse-phase solid-phase extraction to promote retention of tryptic peptides. Here we report that TFA and other carboxylate ion-pairing reagents are inefficient for reverse-phase solid-phase extraction of ADP-ribosylated peptides. Substitution of TFA with cationic ion-pairing reagents, such as triethylammonium acetate (TEAA), improves recovery of ADP-ribosylated peptides. We further demonstrate that substitution of TFA with TEAA in a proteomics workflow specific for identifying ADP-ribosylated peptides increases identification rates of ADP-ribosylated peptides by LC-MS/MS.

中文翻译:

与醋酸三乙基铵的离子配对改善了 ADP 核糖基化肽的固相萃取。

ADP-核糖基化是指用小分子ADP-核糖的单体或聚合物对蛋白质底物进行翻译后修饰。ADP-核糖基化受酶促调节并在细胞过程中发挥作用,包括 DNA 修复、核酸代谢、细胞死亡、细胞应激反应和抗病毒免疫。ADP-核糖基化领域的最新进展促进了蛋白质组学方法的发展,以通过液相色谱串联质谱法 (LC-MS/MS) 富集和鉴定内源性 ADP-核糖基化肽。其中许多方法依赖于反相固相萃取作为制备细胞肽的关键步骤,以用于蛋白质组学工作流程中的进一步富集步骤。阴离子离子对试剂三氟乙酸 (TFA) 通常用于反相固相萃取,以促进胰蛋白酶肽的保留。在这里我们报告 TFA 和其他羧酸根离子对试剂对于 ADP 核糖基化肽的反相固相提取效率低下。用阳离子离子对试剂(例如醋酸三乙铵 (TEAA))替代 TFA 可提高 ADP 核糖基化肽的回收率。我们进一步证明,在专用于鉴定 ADP 核糖基化肽的蛋白质组学工作流程中,用 TEAA 替代 TFA 可提高 LC-MS/MS 对 ADP 核糖基化肽的鉴定率。用阳离子离子对试剂(例如醋酸三乙铵 (TEAA))替代 TFA 可提高 ADP 核糖基化肽的回收率。我们进一步证明,在专用于鉴定 ADP 核糖基化肽的蛋白质组学工作流程中,用 TEAA 替代 TFA 可提高 LC-MS/MS 对 ADP 核糖基化肽的鉴定率。用阳离子离子对试剂(例如醋酸三乙铵 (TEAA))替代 TFA 可提高 ADP 核糖基化肽的回收率。我们进一步证明,在专用于鉴定 ADP 核糖基化肽的蛋白质组学工作流程中,用 TEAA 替代 TFA 可提高 LC-MS/MS 对 ADP 核糖基化肽的鉴定率。
更新日期:2020-01-07
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