作者:Richard L. Beardsley、Laura A. Sharon、James P. Reilly
DOI:10.1021/ac050540k
日期:2005.10.1
A novel peptide derivatization strategy based on guanidination and amidination is presented. Mass-coded labels help distinguish N- and C-terminal fragment ions produced by collision-induced dissociation and are of general utility since peptide N-termini are coded. The amidine labels also promote specific fragmentation pathways that elucidate N-terminal residues and provide valuable internal calibrants. This strategy is demonstrated with the tryptic peptides of several model proteins, including two that are phosphorylated. Additionally, interpreted peptide sequences are matched against a database of over 80 000 proteins to assess the selectivity of this sequencing approach.
提出了一种基于胍化和酰胺化的新型肽衍生化策略。质量编码标签有助于区分由碰撞诱导解离产生的N端和C端片段离子,由于肽N端具有编码特性,因此具有普遍实用性。脒标签还能促进特定的碎裂路径,用于阐明N端残基,并提供有价值的内部校准物。该策略通过几种模型蛋白的胰蛋白酶解肽进行了验证,其中包括两种磷酸化蛋白。此外,解释的肽序列与超过80,000种蛋白质的数据库进行了匹配,以评估这种测序方法的选择性。