Method to site-specifically identify and quantitate carbonyl end products of protein oxidation using oxidation-dependent element coded affinity tags (O-ECAT) and nanoliquid chromatography Fourier transform mass spectrometry

Journal of Proteome Research
Susan LeeClaude F Meares

Abstract

Protein oxidation is linked to cellular stress, aging, and disease. Protein oxidations that result in reactive species are of particular interest, since these reactive oxidation products may react with other proteins or biomolecules in an unmediated and irreversible fashion, providing a potential marker for a variety of disease mechanisms. We have developed a novel system to identify and quantitate, relative to other states, the sites of oxidation on a given protein. This presents a significant advancement over current methods, combining strengths of current methods and adding the abilities to multiplex, quantitate, and probe more modified amino acids. A specially designed Oxidation-dependent carbonyl-specific Element-Coded Affinity Mass Tag (O-ECAT), AOD, ((S)-2-(4-(2-aminooxy)-acetamido)-benzyl)-1,4,7,10-tetraazacyclododecane-N,N',N' ',N'''-tetraacetic acid, is used to covalently tag the residues of a protein oxidized to aldehyde or keto end products. O-ECAT can be loaded with a variety of metals, which yields the ability to generate mass pairs and multiplex multiple samples. The O-ECAT moiety also serves as a handle for identification, quantitation, and affinity purification. After proteolysis, the AOD-tagged peptides are af...Continue Reading

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