Precorrin-2 C20-methyltransferase
In enzymology, precorrin-2 C20-methyltransferase is an enzyme that catalyzes the chemical reaction
This methylation reaction converts precorrin-2 into precorrin-3A. The methyl group comes from the cofactor, S-adenosyl methionine, which gives S-adenosyl-L-homocysteine.
The enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:precorrin-4 C20-methyltransferase and another names in common use is CobI. It is part of the biosynthetic pathway to cobalamin in aerobic bacteria.