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cobalamin 5'-phosphate synthase/cobalamin synthase cobS is involved with cobalamin biosynthesis in part III of colbalmin biosynthesis. The enzyme catyalzes the reactions adenosylcobinamide-GDP + alpha-ribazole-5'-P = adenosylcobalamin-5'-phosphate + GMP and adenosylcobinamide-GDP + alpha-ribazole = adenosylcobalamin + GMP. The protein product is associated with a large complex of proteins and is induced by cobinamide. [Biosynthesis of cofactors, prosthetic groups, and carriers, Heme, porphyrin, and cobalamin]
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