Accepted name: cobalt-precorrin-6B (C15)-methyltransferase [decarboxylating]
Reaction: cobalt-precorrin-6B + S-adenosyl-L-methionine = cobalt-precorrin-7 + S-adenosyl-L-homocysteine + CO2
Other name(s): cbiT (gene name); S-adenosyl-L-methionine:precorrin-7 C15-methyltransferase (C-12-decarboxylating); cobalt-precorrin-7 (C15)-methyltransferase [decarboxylating]
Systematic name: S-adenosyl-L-methionine:precorrin-6B C15-methyltransferase (C-12-decarboxylating)
Comments: This enzyme catalyses both methylation at C-15 and decarboxylation of the C-12 acetate side chain of cobalt-precorrin-6B, a step in the anaerobic (early cobalt insertion) adenosylcobalamin biosynthesis pathway.
1.  Keller, J.P., Smith, P.M., Benach, J., Christendat, D., deTitta, G.T. and Hunt, J.F. The crystal structure of MT0146/CbiT suggests that the putative precorrin-8w decarboxylase is a methyltransferase. Structure 10 (2002) 1475–1487. [PMID: 12429089]
2.  Santander, P.J., Kajiwara, Y., Williams, H.J. and Scott, A.I. Structural characterization of novel cobalt corrinoids synthesized by enzymes of the vitamin B12 anaerobic pathway. Bioorg. Med. Chem. 14 (2006) 724–731. [PMID: 16198574]
3.  Moore, S.J., Lawrence, A.D., Biedendieck, R., Deery, E., Frank, S., Howard, M.J., Rigby, S.E. and Warren, M.J. Elucidation of the anaerobic pathway for the corrin component of cobalamin (vitamin B12). Proc. Natl Acad. Sci. USA 110 (2013) 14906–14911. [PMID: 23922391]
[EC created 2010, modified 2013]

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