首页> 外文会议>Complex Medical Engineering, 2009. CME >Glycation induced modification and identification of AGEs-precursors and AGEs in human serum albumin
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Glycation induced modification and identification of AGEs-precursors and AGEs in human serum albumin

机译:糖基化诱导人血清白蛋白中AGEs前体和AGEs的修饰和鉴定

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AGEs are a heterogeneous group of proteins that have been shown to react with the amino group of the N-terminal amino acid residue and the side-chains of arginine and lysine residues. Glycation induced protein modifications has been implicated in diabetes and its associated complications like nephropathy, retinopathy, aging as well as in atherosclerosis, Alzheimer's and Parkinson's diseases. The identification and structure elucidation of AGEs is therefore of great importance. Mass spectrometry, due to its high specificity and sensitivity, has widely been applied for the identification and structure elucidation of AGEs. We report the identification of AGEs-precursors and AGEs based on relative mass changes due to specific AGEs formation. HPLC-ESIMS, ESI-MS/MS and mascot data base were used to identify peptides sequence for non-glycated HSA. The relative mass changes due to specific AGE-precursors and AGEs formation were added to the non-glycated peptides followed by a thorough manual search of the glycated samples that resulted in the identification of ten modified peptides for the formation of five AGEs namely CML (1), Pyrraline (3), Imidazolone A (2), Imidazolone B (1) and AFGP (3). Also, seven glycated peptides were identified for the formation of AGEs-precursors.
机译:AGEs是一组异质蛋白质,已显示与N末端氨基酸残基的氨基以及精氨酸和赖氨酸残基的侧链反应。糖基化诱导的蛋白质修饰涉及糖尿病及其相关并发症,例如肾病,视网膜病,衰老以及动脉粥样硬化,阿尔茨海默氏病和帕金森氏病。因此,AGEs的鉴定和结构阐明非常重要。质谱法由于其高特异性和灵敏度而被广泛用于AGEs的鉴定和结构解析。我们报告由于特定的AGEs形成相对质量变化的基础上识别AGEs前体和AGEs。 HPLC-ESIMS,ESI-MS / MS和吉祥物数据库用于鉴定非糖化HSA的肽序列。将由于特定AGE前体和AGEs形成而引起的相对质量变化添加到非糖化肽中,然后彻底手动搜索糖化样品,从而鉴定出十种修饰肽以形成五个AGEs,即CML(1 ),吡咯啉(3),咪唑酮A(2),咪唑酮B(1)和AFGP(3)。另外,鉴定了七个糖基化肽以形成AGEs前体。

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