Research Focus

Biology and biological engineering are being increasingly driven by advances in bioanalytical techniques and instrumentation. My research is focused on applications of biological mass spectrometry for the characterization and quantitation of DNA and protein damage caused by exposure both to xenobiotic substances and to endogenous compounds that are formed during various metabolic pathways. In the case of xenobiotics, e.g., smoking-related or diet-related carcinogens, quantitation of modifications to DNA or proteins can provide estimates of individual exposure to the active forms of these substances. DNA or protein modifications arising from endogenous substances, e.g., peroxynitrite, can provide valuable clues towards the biochemistry of their formation and often towards the subtle but important balances between essential vs damaging levels of nominally normal metabolites.

Recent Publications

Joseph M. Lee, Jacquin C. Niles, John S. Wishnok, and Steven R. Tannenbaum. Peroxynitrite reacts with 8-nitropurines to yield 8-oxopurines. Chem. Res. Toxicol., 15, 7-17 (2002).

Jacquin C. Niles, John S. Wishnok, and Steven R. Tannenbaum. A novel nitroimidazole compound formed during the reaction of peroxynitrite with 2',3',5'-tri-O-acetyl-guanosine. J. Am. Chem. Soc., 49, 12147-12151 (2001).

John T. Mehl, Paul L. Skipper, Steven R. Tannenbaum, John S. Wishnok, Barbara J. Hughey, Robert E. Klinkowstein, and Ruth E. Shefer. GC and LC interfaces for biological AMS. Proceedings of the 7th International Symposium on the Synthesis and Applications of Isotopes and Isotopically Labelled Compounds. Dresden, Germany, June 2000. In press. (2001).

Kaisheng Jiao, Saraswathi Mandapati, Paul L. Skipper, Steven R. Tannenbaum, and John S. Wishnok. Site-selective nitration of tyrosine in human serum albumin by peroxynitrite. Anal. Biochem., 293, 43-52 (2001).

Natalia Tretyakova, Brock Matter, Alexis Ogdie, John S. Wishnok, and Steven R. Tannenbaum. Locating nucleobase lesions within DNA sequences by MALDI-TOF mass spectral analysis of exonuclease ladders. Chem. Res. Toxicol., 14, 1058-1070 (2001).

Jacquin C. Niles, John S. Wishnok, and Steven R. Tannenbaum. Spiroiminohydantoin is the major product of the 8-oxo-7-dihydroguanosine reaction with peroxynitrite in the presence of thiols and guanosine photooxidation by methylene blue. Organic Letters, 3, 963-966 (2000).

Barbara J. Hughey, Paul L. Skipper, Robert E. Klinkowstein, Ruth E. Shefer, John S. Wishnok, and Steven R. Tannenbaum. Low-energy biomedical GC-AMS system for 14C and 3H detection. Nuclear. Inst. Methods Phys. Res. B., 172, 40-46 (2000).

Natalia Y. Tretyakova, Samar Burney, Burcak Pamir, John S. Wishnok, Peter C. Dedon, Gerald N. Wogan, and Steven R. Tannenbaum. Peroxynitrite-induced DNA damage in the supF gene: correlation with the mutational spectrum. Mutat Res., 447, 287-303 (2000).

Natalia Y. Tretyakova, John S. Wishnok, and Steven R. Tannenbaum. Peroxynitrite-induced secondary oxidative lesions at guanine nucleobases: chemical stability and recognition by the Fpg DNA repair enzyme. Chem. Res. Toxicol., 13, 658-664 (2000).

Jacquin C. Niles, Samar Burney, Sukhjeet P. Singh, John S. Wishnok, and Steven R. Tannenbaum. Peroxynitrite reaction products of 3',5'-di-O-acetyl-8-oxo-7,8-dihydro-2'-deoxyguanosine. Proc. Natl. Acad. Sci. USA., 96, 11727-11734 (1999).

Lacreis C. Kidd, W.G. Stillwell, Mimi C. Yu, John S. Wishnok, Paul L. Skipper, Ronald K. Ross, Brian E. Henderson, and Steven R. Tannenbaum. Urinary excretion of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) in White, African-American, and Asian-American men in Los Angeles County. Cancer Epidemiol. Biomarkers Prev., 8, 439-445 (1999).

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