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"B12" and "Cbl" redirect here. For other uses of B12, see B12 (disambiguation). For the musical group, see Carbon Based Lifeforms. Pharmaceutical compound Vitamin B12 General skeletal formula of cobalamins Stick model of cyanocobalamin (R = CN) based on the crystal structure Clinical data Other names Vitamin B12, vitamin B-12, cobalamin AHFS / Drugs.com Monograph MedlinePlus a605007 License ...
Vitamin B 12 is a major dietary methyl donor, involved in the one-carbon cycle of metabolism and a recent genome-wide association (GWA) analysis showed that increased DNA methylation is associated with increased BMI in adults, [60] consequently a deficiency of vitamin B 12 may disrupt DNA methylation and increase non-communicable disease risk.
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]
The structure of vitamin B 12 was the first low-molecular weight natural product determined by x-ray analysis rather than by chemical degradation. Thus, while the structure of this novel type of complex biomolecule was established, its chemistry remained essentially unknown; exploration of this chemistry became one of the tasks of the vitamin's chemical synthesis.
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).
In a newly diagnosed vitamin B 12-deficient patient, normally defined as when serum levels are less than 200 pg/ml, daily IM injections of hydroxocobalamin up to 1,000 μg (1 mg) per day are given to replenish the body's depleted cobalamin stores. In the presence of neurological symptoms, following daily treatment, injections up to weekly or ...
The Schilling test distinguished PA from other forms of B 12 deficiency, [50] specifically, from Imerslund–Gräsbeck syndrome, a B 12-deficiency caused by mutations in CUBN that codes for cubilin the cobalamin receptor. [1] Vitamin B12 deficiency is also prevalent in patients having Crohn's disease (CD) so it should be differentiated. [62]
Adenosylcobalamin (AdoCbl), also known as coenzyme B 12, cobamamide, and dibencozide, is one of the biologically active forms of vitamin B 12. [ 1 ] Schematic diagram of the propionate metabolic pathway.
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