摘要
采用胰蛋白酶(Trypsin)单独酶切与不同酶量的赖氨酸C端内切酶(Lys-C/trypsin)顺序酶切两种方法,对293T细胞全蛋白样本进行酶解消化,系统评估Lys-C/trypsin顺序酶切与Trypsin单一酶切在蛋白质组学样本制备中的差别。实验结果表明,Lys-C/trypsin顺序酶切不仅能显著提高肽段和蛋白质的鉴定数目,同时降低遗漏K酶切位点的数目及比例,而且得到的肽段长度有利于质谱鉴定,蛋白质覆盖率明显提升。通过对酶的用量进行优化对比,最终确定了Lys-C/trypsin顺序酶切时酶的合理用量。本研究结果对提高蛋白质组学样本的制备质量以及蛋白质的序列鉴定覆盖度具有指导意义。
Endoproteinase Lys-C/trypsin sequential digestion and trypsin digestion were used in 293T cell proteomics sample preparation and the results of Lys-C/trypsin sequential digestion and trypsin digestion in proteomics sample preparation was systematically evaluated. It was found that the number of identified peptides and proteins increased significantly, and missed cleavage sites, especially K sites decreased dramatically through Lys-C/trypsin sequential digestion. And the average sequence coverage of identified proteins in Lys-C/trypsin sequential digestion sample was higher than that in trypsin digestion sample. Besides, different amount of enzymes was tested to select the optimal usage of enzymes in Lys-C/trypsin sequential digestion. This study provided the references for proteomics sample preparation.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2017年第3期316-321,共6页
Chinese Journal of Analytical Chemistry
基金
上海市青年科技英才扬帆计划(No.16YF1414000)
国家自然科学基金(No.31370814)
上海市科学技术委员会(No.14DZ2261100)资助~~
