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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).
Vitamin B 12 deficiency is most commonly caused by malabsorption, but can also result from low intake, immune gastritis, low presence of binding proteins, or use of certain medications. [6] Vegans —people who choose to not consume any animal-sourced foods—are at risk because plant-sourced foods do not contain the vitamin in sufficient ...
Intrinsic factor (IF), cobalamin binding intrinsic factor, [5] also known as gastric intrinsic factor (GIF), is a glycoprotein produced by the parietal cells (in humans) or chief cells (in rodents) of the stomach. It is necessary for the absorption of vitamin B 12 later on in the distal ileum of the small intestine. [6]
TC-2 binds cobalamin once it has been taken up by enterocytes of the terminal ileum and the "Intrinsic Factor-Vitamin B12" complex has been degraded. TC-2 is then involved with the transport of Vitamin B12 to the tissues, where it binds to its plasma membrane receptor (TC-2R), a heavily glycosylated protein with a monomeric molecular mass of 62 ...
One essential function of haptocorrin is protection of the acid-sensitive vitamin B 12 while it moves through the stomach. A second function is serum HC binding of the great majority of circulating vitamin B 12, rendering it unavailable for take-up by cells. This is conjectured to be a circulating storage function.
“Vitamin B12 requirements are low because we can store up to 2,500 micrograms in the liver,” says Ryan D. Andrews, R.D., C.S.C.S., principal nutritionist at Precision Nutrition. So target just ...
Upon deprotonation, the corrinoid ring is capable of binding cobalt. 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.
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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