First purified recombinant CYP75B including transmembrane helix with unexpected high substrate specificity to (2R)-naringenin

Anthochlor pigments (chalcones and aurones) play an important role in yellow flower colourization, the formation of UV-honey guides and show numerous health benefits. The B-ring hydroxylation of chalcones is performed by membrane bound cytochrome P450 enzymes. It was assumed that usual flavonoid 3′-...

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Veröffentlicht in:Scientific reports 2022-05, Vol.12 (1), p.8548-8548, Article 8548
Hauptverfasser: Hausjell, Johanna, Weissensteiner, Julia, Molitor, Christian, Schlangen, Karin, Spadiut, Oliver, Halbwirth, Heidi
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Sprache:eng
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Zusammenfassung:Anthochlor pigments (chalcones and aurones) play an important role in yellow flower colourization, the formation of UV-honey guides and show numerous health benefits. The B-ring hydroxylation of chalcones is performed by membrane bound cytochrome P450 enzymes. It was assumed that usual flavonoid 3′-hydroxlases (F3′Hs) are responsible for the 3,4- dihydroxy pattern of chalcones, however, we previously showed that a specialized F3′H, namely chalcone 3-hydroxylase (CH3H), is necessary for the hydroxylation of chalcones. In this study, a sequence encoding membrane bound CH3H from Dahlia variabilis was recombinantly expressed in yeast and a purification procedure was developed. The optimized purification procedure led to an overall recovery of 30% recombinant Dv CH3H with a purity of more than 84%. The enzyme was biochemically characterized with regard to its kinetic parameters on various substrates, including racemic naringenin, as well as its enantiomers (2 S )-, and (2 R )-naringenin, apigenin and kaempferol. We report for the first time the characterization of a purified Cytochrome P450 enzyme from the flavonoid biosynthesis pathway, including the transmembrane helix. Further, we show for the first time that recombinant Dv CH3H displays a higher affinity for (2 R )-naringenin than for (2 S )-naringenin, although (2 R )-flavanones are not naturally formed by chalcone isomerase.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-11556-3