Reaction intermediates in the heme degradation reaction by HutZ from: Vibrio cholerae

Takeshi Uchida, Yukari Sekine, Nobuhiko Dojun, Ariel Lewis-Ballester, Izumi Ishigami, Toshitaka Matsui, Syun Ru Yeh, Koichiro Ishimori

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


HutZ is a heme-degrading enzyme in Vibrio cholerae. It converts heme to biliverdin via verdoheme, suggesting that it follows the same reaction mechanism as that of mammalian heme oxygenase. However, none of the key intermediates have been identified. In this study, we applied steady-state and time-resolved UV-vis absorption and resonance Raman spectroscopy to study the reaction of the heme-HutZ complex with H2O2 or ascorbic acid. We characterized three intermediates: oxyferrous heme, meso-hydroxyheme, and verdoheme complexes. Our data support the view that HutZ degrades heme in a manner similar to mammalian heme oxygenase, despite their low sequence and structural homology.

Original languageEnglish
Pages (from-to)8104-8109
Number of pages6
JournalDalton Transactions
Issue number25
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Inorganic Chemistry


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