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• W2007061013 abstract "The gas phase acetylation of cationized arginine residues is demonstrated here using ion/ion reactions with sulfosuccinimidyl acetate (sulfo-NHS acetate) anions. Previous reports have demonstrated the gas phase modification of uncharged primary amine (the N-terminus and ɛ-amino side chain of lysine) and uncharged guanidine (the arginine side chain) functionalities via sulfo-NHS ester chemistry. Herein, charge-saturated arginine-containing peptides that contain sodium ions as the charge carriers, such as [ac-ARAAARA+2Na]2+, are shown to exhibit strong reactivity toward sulfo-NHS acetate whereas the protonated peptide analogs exhibit no such reactivity. This difference in reactivity is attributed to the lower sodium ion (as compared to proton) affinity of the arginine, which results in increased nucleophilicity of the cationized arginine guanidinium functionality. This increased nucleophilicity improves the arginine residue's reactivity toward sulfo-NHS esters and enhances the gas phase covalent modification pathway. No such dramatic increase in reactivity toward sulfo-NHS acetate has been observed upon sodium cationization of lysine amino acid residues, indicating that this behavior appears to be unique to arginine. The sodium cationization process is demonstrated in the condensed phase by simply spiking sodium chloride into the peptide sample solution and in the gas phase by a peptide-sodium cation exchange process with a sulfo-NHS acetate sodium-bound dimer cluster reagent. This methodology demonstrates several ways by which arginine can be covalently modified in the gas phase even when it is charged. Collisional activation of an acetylated arginine product can result in deguanidination of the residue, generating an ornithine. This gas phase ornithination exhibits similar site-specific fragmentation behavior to that observed with peptides ornithinated in solution and may represent a useful approach for inducing selective peptide cleavages." @default.
• W2007061013 created "2016-06-24" @default.
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• W2007061013 date "2013-11-01" @default.
• W2007061013 modified "2023-10-16" @default.
• W2007061013 title "Strategies for the gas phase modification of cationized arginine via ion/ion reactions" @default.
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• W2007061013 doi "https://doi.org/10.1016/j.ijms.2013.05.026" @default.
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