12-dehydrotetracycline 5-monooxygenase/anhydrotetracycline 6-monooxygenase

UniProtKB accession:  L8EUQ6

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UniProtKB description:  Involved in the biosynthesis of the antibiotics oxytetracycline and tetracycline. OxyS starts by catalyzing the stereospecific hydroxylation of anhydrotetracycline at C(6) position to yield 5a,11a-dehydrotetracycline (12-dehydrotetracycline). If the released product is captured by OxyR, it is reduced to tetracycline. However, if the released product is recaptured by OxyS, it performs an additional hydroxylation at C(5), producing 5a,11a-dehydrooxytetracycline, which, following the action of OxyR becomes oxytetracycline.