Specific role of taurine in the 8-brominated-2′-deoxyguanosine formation

Takashi Asahi, Yoshimasa Nakamura, Yoji Kato, Toshihiko Osawa

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

At the sites of inflammation, hypohalous acids, such as hypochlorous acid and hypobromous acid (HOBr), are produced by myeloperoxidase. These hypohalous acids rapidly react with the primary amino groups to produce haloamines, which are relatively stable and can diffuse long distances and cross the plasma membrane. In this study, we examined the effects of taurine, the most abundant free amino acid in the leukocyte cytosol, on the hypohalous acid-dependent formation of 8-chloro-2′-deoxyguanosine (8-CldG) and 8-bromo-2′-deoxyguanosine (8-BrdG). The reaction of taurine with HOBr yielded taurine bromamine, which is the most stable among other bromamines of amino acids. Taurine also enhanced the bromination of only dG among the four 2′-deoxynucleosides, whereas it inhibited the 8-CldG formation. The specificity of taurine for the enhanced formation of halogenated dG is completely different from that of nicotine, an enhancer of chlorination. The amount of dibrominated taurine (taurine dibromamine) closely correlated with the formation of 8-BrdG, suggesting that taurine dibromamine might be a plausible mediator for the dG bromination in vivo.

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalArchives of Biochemistry and Biophysics
Volume586
DOIs
Publication statusPublished - Nov 15 2015

Keywords

  • 8-bromo-2′-deoxyguanosine
  • Bromamine
  • Hypobromous acid
  • Nicotine
  • Taurine

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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