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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 is also offered as a dietary supplement. [12] There is no advantage to the use of adenosylcobalamin or methylcobalamin forms for the treatment of vitamin B 12 deficiency. [20] [21] [4] Hydroxocobalamin can be injected intramuscularly to treat vitamin B 12 deficiency. It can also be injected intravenously for the purpose of ...
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).
Cobalamin biosynthesis is the process by which bacteria and archea make cobalamin, vitamin B 12. Many steps are involved in converting aminolevulinic acid via uroporphyrinogen III and adenosylcobyric acid to the final forms in which it is used by enzymes in both the producing organisms and other species, including humans who acquire it through ...
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 ...
Cyanocobalamin is a form of vitamin B 12 used to treat and prevent vitamin B 12 deficiency except in the presence of cyanide toxicity. [7] [8] [2] The deficiency may occur in pernicious anemia, following surgical removal of the stomach, with fish tapeworm, or due to bowel cancer.
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They are no longer considered as such, and the numbers that were assigned to them now form the "gaps" in the true series of B-complex vitamins described above (for example, there is no vitamin B 4). Some of them, though not essential to humans, are essential in the diets of other organisms; others have no known nutritional value and may even be ...
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