Pentalenic acid synthase (, CYP105D7, sav7469 (gene)) is an enzyme with systematic name . This enzyme catalyses the following chemical reaction

Pentalenic acid synthase from Streptomyces avermitilis is an oxidoreductase which uses molecular oxygen to insert a hydroxy group into 1-deoxypentalenic acid. It requires ferredoxin to transfer electrons to the cytochrome P450 active site.

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