Title
Characterization of unstable intermediates and oxidized products formed during cyanogen bromide cleavage of peptides and proteins by electrospray mass spectrometry Characterization of unstable intermediates and oxidized products formed during cyanogen bromide cleavage of peptides and proteins by electrospray mass spectrometry
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences. Pharmacy
Publication type
article
Publication
Washington, D.C. ,
Subject
Chemistry
Pharmacology. Therapy
Source (journal)
Analytical chemistry. - Washington, D.C.
Volume/pages
68(1996) :19 , p. 3422-3430
ISSN
0003-2700
ISI
A1996VK59000026
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Products formed during cyanogen bromide (CNBr) digestion of alpha-endorphin, beta-endorphin, and horse heart myoglobin are examined using reversed-phase high-performance liquid chromatography and electrospray mass spectrometry. It is demonstrated that unstable intermediate reaction products maybe formed, as well as oxidized products when the CNBr reaction is performed in 0.1% TFA in water/acetonitrile (6:4 v/v) and that, under other conditions commonly employed for the CNBr cleavage reaction, unstable intermediate products are also generated. The formation of the expected cleavage products is found to be improved by adjusting the hydrolysis conditions. The structure of the intermediate formed from alpha-endorphin is examined using electrospray mass spectroemtry in combination with low-energy collision-induced dissociation and tandem mass spectrometry and is shown to have a cyclic hydrated homoserine iminolactone part. The results obtained in this study explain the formation of partially cleaved proteins in the case of Met-Thr-containing sequences, which likely have a cyclic hydrated homoserine iminolactone part instead of the putative homoserine residue.
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