Adenosylcobinamide-GDP ribazoletransferase

Adenosylcobinamide-GDP ribazoletransferase (, CobS, cobalamin synthase, cobalamin-5'-phosphate synthase, cobalamin (5'-phosphate) synthase) is an enzyme with systematic name adenosylcobinamide-GDP:alpha-ribazole ribazoletransferase. This enzyme catalyses the following chemical reaction


 * (1) adenosylcobinamide-GDP + alpha-ribazole $$\rightleftharpoons$$ GMP + adenosylcobalamin
 * (2) adenosylcobinamide-GDP + alpha-ribazole 5'-phosphate $$\rightleftharpoons$$ GMP + adenosylcobalamin 5'-phosphate

This enzyme is part of the biosynthetic pathway to cobalamin (vitamin B12) in bacteria.