Abstract
Multiple gas phase ion/ion covalent modifications of peptide and protein ions are demonstrated using cluster-type reagent anions of N-hydroxysulfosuccinimide acetate (sulfo-NHS acetate) and 2-formyl-benzenesulfonic acid (FBMSA). These reagents are used to selectively modify unprotonated primary amine functionalities of peptides and proteins. Multiple reactive reagent molecules can be present in a single cluster ion, which allows for multiple covalent modifications to be achieved in a single ion/ion encounter and at the ‘cost’ of only a single analyte charge. Multiple derivatizations are demonstrated when the number of available reactive sites on the analyte cation exceeds the number of reagent molecules in the anionic cluster (e.g., data shown here for reactions between the polypeptide [K10 + 3H]3+ and the reagent cluster [5R5Na – Na]–). This type of gas-phase ion chemistry is also applicable to whole protein ions. Here, ubiquitin was successfully modified using an FBMSA cluster anion which, upon collisional activation, produced fragment ions with various numbers of modifications. Data for the pentamer cluster are included as illustrative of the results obtained for the clusters comprised of two to six reagent molecules.
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Acknowledgments
The authors acknowledge support for this work by AB SCIEX and by the National Institutes of Health under grant GM 45372. B.M.P. acknowledges receipt of a Purdue University Bilsland Dissertation Fellowship.
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Prentice, B.M., Stutzman, J.R. & McLuckey, S.A. Reagent Cluster Anions for Multiple Gas-Phase Covalent Modifications of Peptide and Protein Cations. J. Am. Soc. Mass Spectrom. 24, 1045–1052 (2013). https://doi.org/10.1007/s13361-013-0637-6
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DOI: https://doi.org/10.1007/s13361-013-0637-6