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- W2065847595 abstract "Control of pH in aminoethylation reactions is critical for maintaining high selectivity towards cysteine modification. Measurement of aminoethylation rate constants by liquid chromatography mass spectrometry demonstrates reaction selectivity of cysteine>>amino-terminus>>histidine. Lysine and methionine were not reactive at the conditions used. For thiol modification, the acid/base property of the gamma-thialysine residue measured by NMR results in a 1.15 decrease in pK(a) (relative to a lysine residue). NMR confirms ethylene imine is the reactive intermediate for alkylation of peptide nucleophiles with bromoethylamine. Conversion of bromoethylamine into ethylene imine prior to exposure to the target thiol, provides a reagent that promotes selectivity by allowing precise control of reaction pH. Reaction selectivity plots of relative aminoethylation rates for cysteine, histidine, and N-terminus imine demonstrate increasing alkaline conditions favors thiol modification. When applied to protein modification, the conversion of bromoethylamine into ethylene imine and buffering at alkaline pH will allow optimal cysteine residue aminoethylation." @default.
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- W2065847595 date "2005-11-01" @default.
- W2065847595 modified "2023-10-12" @default.
- W2065847595 title "Aminoethylation in model peptides reveals conditions for maximizing thiol specificity" @default.
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- W2065847595 doi "https://doi.org/10.1016/j.abb.2005.08.020" @default.
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