Keyword
Cobalamin biosynthesis
| Definition | Protein involved in the synthesis of cobalamin. Cobalamin, which is synthesized by microorganisms, has equatorial sites occupied by a modified porphyrin ring system, with two of the four pyrrol rings fused directly (without an intervening methine bridge). The modified porphyrin system binds a cobalt(III) ion in the center, and this is called a corrin ring system. One axial site is occupied usually by an intramolecularly-bound dimethylbenzimidazole nucleotide and the other axial site is occupied by a number of different ligands such as water (aquacobalamin), cyanide (cyanocobalamine=vitamin B12), glutathione (glutathionylcobalamine), 5'deoxyadenosine (adenosylcobalamine=coenzyme B12) or a methyl group (methylcobalamin). Vitamin B12, for instance, is a prosthetic group of certain mammalian enzymes, where it is essential for the normal maturation and development of erythrocytes. A deficiency in the diet or more frequently the failure to absorb the vitamin B12 give rise to pernicious anemia. |
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| Synonyms |
Cobalamin anabolism
Cobalamin biosynthetic process
Cobalamin formation
Cobalamin synthesis
Vitamin B12 anabolism
Vitamin B12 biosynthesis
Vitamin B12 biosynthetic process
Vitamin B12 formation
Vitamin B12 synthesis
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| Category |
› Biological process
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| GO | › cobalamin biosynthetic process [ GO:0009236 ]
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| Graphical | 
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