ID   1.14.13.83
DE   precorrin-3B synthase.
AN   precorrin-3X synthase.
CA   2 H(+) + NADH + O2 + precorrin-3A = H2O + NAD(+) + precorrin-3B.
CC   -!- An oxygen atom from dioxygen is incorporated into the macrocycle at
CC       C-20.
CC   -!- In the aerobic cobalamin biosynthesis pathway, four enzymes are
CC       involved in the conversion of precorrin-3A to precorrin-6A.
CC   -!- This enzyme carries out the first of the four steps, yielding
CC       precorrin-3B as the product.
CC   -!- This is followed by three methylation reactions, which introduce a
CC       methyl group at C-17 (CobJ; EC 2.1.1.131), C-11 (CobM; 2.1.1.133) and
CC       C-1 (CobF; EC 2.1.1.152) of the macrocycle, giving rise to precorrin-
CC       4, precorrin-5 and precorrin-6A, respectively.
DR   P21637, COBG_SINSX ;
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