Design, Synthesis, and Application of a Hydrazide-Functionalized Isotope-Coded Affinity Tag for the Quantification of Oxylipid−Protein Conjugates
作者:Bingnan Han、Jan F. Stevens、Claudia S. Maier
DOI:10.1021/ac062262a
日期:2007.5.1
An isotopically coded affinity probe was developed and evaluated for the characterization and quantification of proteins adducted by 2-alkenals derived from lipid peroxidation (LPO) processes. Lipid-derived 2-alkenals, such as acrolein and 4-hydroxy-2-nonenal (HNE), have the ability to react with cysteine, histidine, and lysine residues in proteins, thus causing protein damage and loss of protein function. Such modifications of proteins are difficult to characterize in biological samples by mass spectrometry due to the complexity of protein extracts and the low abundance of adducted proteins. The novel aldehyde-reactive, hydrazide-functionalized, isotope-coded affinity tag (HICAT) described in this study was found effective for the selective isolation, detection, and quantification of Michael-type adducts of 2-alkenals with proteins using a combination of affinity isolation, nanoLC, and matrix-assisted laser desorption ionization tandem mass spectrometry (MALDI-MS/MS). The chemical and mass spectrometric properties of the new probe are demonstrated on a model protein treated with HNE. The efficacy of HICAT for the analysis of complex samples was tested using preparations of mitochondrial proteins that were modified in vitro with HNE. The potential of the HICAT strategy for the identification, characterization, and quantification of in vivo oxylipid−protein conjugates is demonstrated on cardiac mitochondrial protein preparations, in which, for example, the ADP/ATP translocase 1 was found adducted to the 2-alkenals, acrolein and 4-hydroxy-2-hexenal, at Cys-256.
开发并评估了一种同位素编码的亲和探针,用于表征和量化被脂质过氧化(LPO)过程中产生的 2-烯烃吸附的蛋白质。脂质衍生的 2-烯烃(如丙烯醛和 4-羟基-2-壬烯醛 (HNE))能够与蛋白质中的半胱氨酸、组氨酸和赖氨酸残基发生反应,从而导致蛋白质损伤和蛋白质功能丧失。由于蛋白质提取物的复杂性和加合物蛋白质的低丰度,很难通过质谱法表征生物样本中蛋白质的这种修饰。本研究中描述的新型醛反应、酰肼功能化、同位素编码的亲和标签(HICAT)可通过亲和分离、纳米液相色谱法和基质辅助激光解吸电离串联质谱法(MALDI-MS/MS)有效地选择性分离、检测和定量 2-烯烃与蛋白质的迈克尔型加合物。新探针的化学和质谱特性在一种经 HNE 处理的模型蛋白质上得到了验证。使用经 HNE 体外修饰的线粒体蛋白质制备物测试了 HICAT 分析复杂样品的功效。在心脏线粒体蛋白质制备物上证明了 HICAT 策略在鉴定、表征和定量体内氧化脂质-蛋白质共轭物方面的潜力,例如,在其中发现 ADP/ATP 转位酶 1 在 Cys-256 处与 2-烯烃、丙烯醛和 4-羟基-2-己烯醛加成。