期刊
PROTEOMICS
卷 9, 期 18, 页码 4416-4420出版社
WILEY
DOI: 10.1002/pmic.200800879
关键词
HepG2 cells; Isothiocyanate-coupled magnetic nanoparticles; MS; N-blocked peptides; Technology
资金
- National Natural Science Foundation of China [30621063, 20635010, 20735005, 20875101]
- National Key Program for Protein Science of China [2006CB910803, 2007CB914104, 2006AA02A308, 2008AA02Z309]
A quick isolation and identification of N-blocked peptides from protein digest mixtures were achieved by diisothiocyanate or isothiocyanate-coupled magnetic nanoparticles and MS. After protein digests were guanidinated and then mixed with diisothiocyanate or isothiocyanate-coupled magnetic nanoparticles, unmodified N-terminal peptides were covalently bound to magnetic nanoparticles, and can be removed from the mixture under magnetic field. Therefore N-blocked peptides could be isolated and analyzed by MALDI or ESI MS. This new strategy was demonstrated with model peptides, proteins, and the lysates of HepG2 cells.
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