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.
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homotetrameric apo form of CbiT crystallized in several space groups, to about 2.5 A resolution, and in complex with S-adenosyl-L-homocysteine, to 1.9 A resolution. The protein shows structural similarity to Rossmann-like S-adenosyl-methionine-dependent methyltransferases, and the cocrystal structure shows that it binds S-adenosyl-methionine in standard geometry near a binding pocket that can accommodate a precorrin substrate. CbiT probably functions as a precorrin methyltransferase
investigation on the use of the oxidized form factor 3 of the trimethylated intermediate precorrin 3 as a substrate for the enzymes of the anaerobic pathway to vitamin B12. Production of factor 3 octamethylester by expression of enzymes enzymes CbiH, CbiG, CbiF, and CbiT, in Escherichia coli and addition of factor 3 octapiperidinium salt
coexpression of the cobA gene from Propionibacterium freudenreichii and the cbiA, -C, -D, -E, -T, -F, -G, -H, -J, -K, -L, and -P genes from Salmonella enterica serovar typhimurium in Escherichia coli result in the production of cobyrinic acid a,c-diamide
Genetically engineered production of 1-desmethylcobyrinic acid, 1-desmethylcobyrinic acid a,c-diamide, and cobyrinic acid a,c-diamide in Escherichia coli implies a role for CbiD in C-1 methylation in the anaerobic pathway to cobalamin