Abstract
The derivatization of cysteine-containing peptides with benzoquinone compounds is rapid, quantitative and specific in acidic media. The conversion of cysteines into hydrophobic benzoquinone-adducted residues in peptides is used here to alter the chromatographic properties of cysteinyl peptides during liquid chromatography separation. The benzoquinone derivatization is shown to allow the accurate selection of cysteine-containing peptides of bovine serum albumin tryptic digest by diagonal reversed-phase chromatography, which consists of one primary and a series of secondary identical liquid chromatographic separations, before and after a cysteinyl-targeted modification of the peptides by benzoquinone compounds.
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Acknowledgement
This work was supported by a Swiss National Science Fundation grant entitled “Development of new analytical tools for proteomics” (Grant No 200020-105489). The Ecole Polytechnique Fédérale de Lausanne is thanked for its financial support in the acquisition of the LC Packings Ultimate™ system. Mélanie Abonnenc and Dr. Niels Lion are thanked for their expertise in LC ESI–MS and very fruitful discussions.
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Dayon, L., Girault, H.H. Diagonal chromatographic selection of cysteinyl peptides modified with benzoquinones. Anal Bioanal Chem 389, 841–849 (2007). https://doi.org/10.1007/s00216-007-1492-8
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DOI: https://doi.org/10.1007/s00216-007-1492-8