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• W2051852020 startingPage "1263" @default.
• W2051852020 abstract "The dinuclear copper complex (α-cyano-4-hydroxycinnamic acid (CHCA) copper salt (CHCA)4Cu2), synthesized by reacting CHCA with copper oxide (CuO), yields increased abundances of [M + xCu − (x−1)H]+ (x = 1–6) ions when used as a matrix for matrix-assisted laser desorption ionization (355 nm Nd:YAG laser). The yield of [M + xCu − (x−1)H]+ (x = 1∼6) ion is much greater than that obtained by mixing peptides with copper salts or directly depositing peptides onto oxidized copper surfaces. The increased ion yields for [M + xCu − (x−1)H]+ facilitate studies of biologically important copper binding peptides. For example, using this matrix we have investigated site-specific copper binding of several peptides using fragmentation chemistry of [M + Cu]+ and [M + 2Cu − H]+ ions. The fragmentation studies reveal interesting insight on Cu binding preferences for basic amino acids. Most notable is the fact that the binding of a single Cu+ ion and two Cu+ ions are quite different, and these differences are explained in terms of intramolecular interactions of the peptide-Cu ionic complex." @default.
• W2051852020 created "2016-06-24" @default.
• W2051852020 creator A5025212044 @default.
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• W2051852020 date "2009-07-01" @default.
• W2051852020 modified "2023-10-18" @default.
• W2051852020 title "A new copper containing MALDI matrix that yields high abundances of [Peptide + Cu]⁺ ions" @default.
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• W2051852020 doi "https://doi.org/10.1016/j.jasms.2009.02.025" @default.
• W2051852020 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19318231" @default.
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