1‐Hydroxy monocyclic carotenoid 3,4‐dehydrogenase from a marine bacterium that produces myxol

Abstract
A crtD (1-HO carotenoid 3,4-dehydrogenase gene) homolog from marine bacterium strain P99-3 included in the gene cluster for the biosynthesis of myxol (3′,4′-didehydro-1′,2′-dihydro-β,ψ-carotene-3,1′,2′-triol) was functionally identified. The P99-3 CrtD was phylogenetically distant from the other CrtDs. A catalytic feature was its high activity for the monocyclic carotenoid conversion: 1′-HO-torulene (3′,4′-didehydro-1′,2′-dihydro-β,ψ-caroten-1′-ol) was prominently formed from 1′-HO-γ-carotene (1′,2′-dihydro-β,ψ-caroten-1′-ol) in Escherichia coli with P99-3 CrtD, indicating that this enzyme has been highly adapted to myxol biosynthesis. This unique type of crtD is a valuable tool for obtaining 1′-HO-3′,4′-didehydro monocyclic carotenoids in a heterologous carotenoid production system

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