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Detection and identification of carcinogen-peptide adducts by nanoelectrospray tandem mass spectrometry

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Journal of the American Society for Mass Spectrometry

Abstract

Nanoelectrospray (nanoES) tandem mass spectrometry was used to examine covalently modified peptides in crude enzymatic digests of human serum albumin (HSA) that had been exposed to either benzo[a]pyrene diol epoxide (B[a]PDE, 1), chrysene diol epoxide (CDE, 2), 5-methylchrysene diol epoxide (5MeCDE, 3), or benzo[g]chrysene diol epoxide (B[g]CDE, 4). The low flow rates of nanoES (∼20 nL/min) allowed several MS/MS experiments to be optimized and performed on a single sample with very little sample consumption (∼30 min analysis time/µL sample). Initially, nanoES was compared with conventional LC/MS/MS analysis of carcinogen-peptide adducts. For example, nanoES analysis of an unseparated digest of B[a]PDE-treated serum albumin revealed the same peptides (RRHPY and RRHPY-FYAPE) that were previously shown, by LC/MS/MS, to be adducted with B[a]PDE. In addition, nanoES could detect unstable peptide adducts that might not otherwise have been directly observable. Finally, nanoES was shown to be an effective way to screen mixtures of modified and unmodified peptides for which no chromatographic information is available.

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Correspondence to John S. Wishnok.

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Harriman, S.P., Hill, J.A., Tannenbaum, S.R. et al. Detection and identification of carcinogen-peptide adducts by nanoelectrospray tandem mass spectrometry. J Am Soc Mass Spectrom 9, 202–207 (1998). https://doi.org/10.1016/S1044-0305(97)00252-3

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  • DOI: https://doi.org/10.1016/S1044-0305(97)00252-3

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