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Methylcobalamin (mecobalamin, MeCbl, or MeB 12) is a cobalamin, a form of vitamin B 12. It differs from cyanocobalamin in that the cyano group at the cobalt is replaced with a methyl group. [1] Methylcobalamin features an octahedral cobalt(III) centre and can be obtained as bright red crystals. [2]
Methylcobalamin (shown) is a form of vitamin B 12. Physically it resembles the other forms of vitamin B 12, occurring as dark red crystals that freely form cherry-colored transparent solutions in water. Vitamin B 12 is the most chemically complex of all the vitamins. [6]
In methylcobalamin the ligand is a methyl group, which is electrophilic. in vitamin B12, the alkyl ligand is an adenosyl group. Related to vitamin B12 are cobalt porphyrins, dimethylglyoximates, and related complexes of Schiff base ligands. These synthetic compounds also form alkyl derivatives that undergo diverse reactions reminiscent of the ...
Adenosylcobalamin Methylcobalamin, another biologically active form. The dark red crystals dissolve in water giving cherry-colored solutions. Cobalamin biosynthesis is the process by which bacteria and archea make cobalamin, vitamin B 12.
In molecular biology, the vitamin B12-binding domain is a protein domain which binds to cobalamin (vitamin B12). It can bind two different forms of the cobalamin cofactor, with cobalt bonded either to a methyl group (methylcobalamin) or to 5'-deoxyadenosine (adenosylcobalamin).
Mutations in the MTR gene have been identified as the underlying cause of methylcobalamin deficiency complementation group G, or methylcobalamin deficiency cblG-type. [5] Deficiency or deregulation of the enzyme due to deficient methionine synthase reductase can directly result in elevated levels of homocysteine ( hyperhomocysteinemia ), which ...
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