Journal
MASS SPECTROMETRY REVIEWS
Volume 30, Issue 3, Pages 366-395Publisher
WILEY
DOI: 10.1002/mas.20285
Keywords
cysteine labeling; peptide enrichment; sub-proteome fractionation; proteomics; PTM; protein quantification
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Amino acid-tagging strategies are widespread in proteomics. Because of the central role of mass spectrometry (MS) as a detection technique in protein sciences, the term mass tagging was coined to describe the attachment of a label, which serves MS analysis and/or adds analytical value to the measurements. These so-called mass tags can be used for separation, enrichment, detection, and quantitation of peptides and proteins. In this context, cysteine is a frequent target for modifications because the thiol function can react specifically by nucleophilic substitution or addition. Furthermore, cysteines present natural modifications of biological importance and a low occurrence in the proteome that justify the development of strategies to specifically target them in peptides or proteins. In the present review, the mass-tagging methods directed to cysteine residues are comprehensively discussed, and the advantages and drawbacks of these strategies are addressed. Some concrete applications are given to underline the relevance of cysteine-tagging techniques for MS-based proteomics. (C) 2010 Wiley Periodicals, Inc., Mass Spec Rev 30:366-395, 2011
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