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• W2783992712 abstract "Abstract In the presence of CoA, cell-free extracts prepared from porcine liver was found to convert 7,8-dihydroxyflavone (DHF) to a pantetheine conjugate, which was a novel flavonoid. We purified a 7,8-DHF-converting enzyme from the extracts, and identified it as hemoglobin (Hb). The purified Hb showed the following two activities: ( i ) degradation of CoA into pantetheine through hydrolytic cleavage to yield pantetheine and 3′-phospho-adenosine-5′-diphosphate (ADP) independently of heme, and ( ii ) addition of a thiol (e.g., pantetheine, glutathione and cysteine) to 7,8-DHF through C-S bond formation. Human Hb also exhibited the above flavonoid-converting activity. In addition, heme-containing enzymes such as peroxidase and catalase added each of pantetheine, glutathione and cysteine to the flavonoid, although no pantetheine conjugates were synthesized when CoA was used as a substrate. These findings indicated that the thiol-conjugating activity is widely observed in heme-containing proteins. On the other hand, only Hb catalyzed the hydrolysis of CoA, followed by the thiol conjugation to synthesize the pantetheine conjugate. To the best of our knowledge, this is the first report showing that Hb has the catalytic ability to convert naturally occurring bioactive compounds, such as dietary flavonoids, to the corresponding conjugates in the presence of thiol donors or CoA." @default.
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• W2783992712 date "2018-01-19" @default.
• W2783992712 modified "2023-09-25" @default.
• W2783992712 title "Hemoglobin catalyzes CoA degradation and thiol addition to flavonoids" @default.
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• W2783992712 doi "https://doi.org/10.1038/s41598-018-19585-7" @default.
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