期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 131, 期 36, 页码 12884-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja904812d
关键词
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资金
- Office of Basic Energy Sciences
- Office of Science,
- U.S. Department of Energy [DE-FG02-00ER15105]
- National Institutes of Health [GM 45372]
- U.S. Department of Energy (DOE) [DE-FG02-00ER15105] Funding Source: U.S. Department of Energy (DOE)
Primary amines present in protonated polypeptides can be covalently modified via gas-phase ion/ion reactions using bifunctional reagent ions. The use of reagent anions with a charge-bearing site that leads to strong interactions with the polypeptide, such as sulfonic acid, gives rise to the formation of along-lived adduct. A distinct reactive functional group, an aldehyde in the present case can then undergo reaction with the peptide. Collisional activation of the adduct ion formed from a reagent with an aldehyde group and a peptide ion with a primary amine gives rise to water loss in conjunction with imine (Schiff base) formation. The covalently bound modification is retained upon subsequent collisional activation. This work demonstrates the ability to selectively modify polypeptide ions in the gas phase within the context of a multistage mass spectrometry experiment.
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