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methylcobalamin (vitamin B12)
Methylcobalamin the cofactor of methionine synthase (homocysteine methyltransferase, a methylcobalamin & N5-methyltetrahydrofolate- dependent enzyme.
In connection with 5,10 methylenetetrahydrofolate reductase activity which generates 5-methyltetrahydrofolate, methionine synthase regulates methionine synthesis & tetrahydrofolate generation. The availability of tetrahydrofolate is critical to DNA & RNA generation.
Related
intrinsic factor; gastric intrinsic factor; IF; INF (GIF, IFMH)
methionine synthase; 5-methyltetrahydrofolate:homocysteine methyltransferase; vitamin-B12 dependent methionine synthase; tetrahydropteroyl-glutamate methyltransferase; MS (MTR)
Schilling test
transcobalamin
vitamin B12 deficiency
vitamin B12 in serum/plasma
General
vitamin B12; cobalamin
Properties
Database Correlations
OMIM 250940
References
- Stryer Biochemistry WH Freeman & Co, New York, 1988 pg 582
- Harrison's Principles of Internal Medicine, 14th ed.
Fauci et al (eds), McGraw-Hill Inc. NY, 1998, pg 2200
Component-of
acetylcysteine/folic acid/methylcobalamin
acetylcysteine/methylcobalamin
ascorbate/biotin/ferrous fumarate/folic acid/iron/methylcobalamin/nicotinamide/pantothenate/pyridoxine/riboflavin/thiamine
ascorbate/biotin/folic acid/methylcobalamin/nicotinamide/pantothenate/pyridoxine/riboflavin/thiamine
ascorbate/biotin/folic acid/methylcobalamin/nicotinamide/pantothenate/pyridoxine/riboflavin/thiamine/zinc citrate
folic acid/methylcobalamin/pyridoxine
methylcobalamin/pyridoxal phosphate