NDLI: Mass spectrometric identification of oxidative modifications of tryptophan residues in proteins: Chemical artifact or post-translational modification?

Content Provider	Springer Nature Link
Author	Perdivara, Irina Deterding, Leesa J. Przybylski, Michael Tomer, Kenneth B.
Copyright Year	2010
Abstract	Oxidative modification of tryptophan to kynurenine (KYN) and N-formyl kynurenine (NFK) has been described in mitochondrial proteins associated with redox metabolism, and in human cataract lenses. To a large extent, however, previously reported identifications of these modifications were performed using peptide mass fingerprinting and/or tandem-MS data of proteins separated by gel electrophoresis. To date, it is uncertain whether NFK and KYN may represent sample handling artifacts or exclusively post-translational events. To address the problem of the origin of tryptophan oxidation, we characterized several antibodies by liquid chromatography-tandem mass spectrometry, with and without the use of electrophoretic separation of heavy and light chains. Antibodies are not normally expected to undergo oxidative modifications, however, several tryptophan (Trp) residues on both heavy and light chains were found extensively modified to both doubly oxidized Trp and KYN following SDS-PAGE separation and in-gel digestion. In contrast, those residues were observed as non-modified upon in-solution digestion. These results indicate that Trp oxidation may occur as an artifact in proteins separated by SDS-PAGE, and their presence should be carefully interpreted, especially when gel electrophoretic separation methods are employed.
Starting Page	1114
Ending Page	1117
Page Count	4
File Format	PDF
ISSN	10440305
Journal	Journal of The American Society for Mass Spectrometry
Volume Number	21
Issue Number	7
e-ISSN	18791123
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-22
Publisher Institution	The American Society for Mass Spectrometry
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Biotechnology Organic Chemistry Proteomics Bioinformatics
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Structural Biology

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