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Vitamin B 12 is the most chemically complex of all vitamins, [6] and for humans the only vitamin that must be sourced from animal-derived foods or supplements. [2] [7] Only some archaea and bacteria can synthesize vitamin B 12. [8] Vitamin B 12 deficiency is a widespread condition that is particularly prevalent in populations with low ...
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.
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 ...
Dietary supplements containing all eight are referred to as a vitamin B complex. Individual B vitamins are referred to by B-number or by chemical name, such as B 1 for thiamine , B 2 for riboflavin , and B 3 for niacin , [ 1 ] [ 2 ] while some are more commonly recognized by name than by number, such as pantothenic acid (B 5 ), biotin (B 7 ...
In vitamin B 12, the resulting complex also features a benzimidazole-derived ligand, and the sixth site on the octahedron serves as the catalytic center. The corrin ring resembles the porphyrin ring. [2] Both feature four pyrrole-like subunits organized into rings.
Lack of vitamin B12 can cause megaloblastic anemia—a condition characterized by larger than normal red blood cells in a smaller than normal amount. This causes fatigue, paleness in the skin ...
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