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Gastric acid is needed to release vitamin B 12 from protein for absorption. Reduced secretion of gastric acid and pepsin, from the use of H 2 blocker or proton-pump inhibitor (PPI) drugs, can reduce the absorption of protein-bound (dietary) vitamin B 12, although not of supplemental vitamin B 12.
6947 n/a Ensembl ENSG00000134827 n/a UniProt P20061 n/a RefSeq (mRNA) NM_001062 n/a RefSeq (protein) NP_001053 n/a Location (UCSC) Chr 11: 59.85 – 59.87 Mb n/a PubMed search n/a Wikidata View/Edit Human Haptocorrin (HC) also known as transcobalamin-1 (TC-1) or cobalophilin is a transcobalamin protein that in humans is encoded by the TCN1 gene. One essential function of haptocorrin is ...
Because vitamin B 12 absorption is a multistep process that involves the stomach, pancreas and small intestine, and is mediated by two carriers: Haptocorrin and intrinsic factor, and because Haptocorrin (transcobalamin I) binds to vitamin B 12, and Vitamin B 12 is acid-sensitive, when vitamin B 12 binds to Haptocorrin it can safely pass through ...
For that reason, Mason says it’s appropriate for older adults, and particularly those taking medications that affect B12 absorption, to consider using a supplement. ... legumes, and protein ...
Lack of intrinsic factor: intrinsic factor is a protein produced by parietal cells in the stomach, and needed in the ileum for the absorption of vitamin B 12. Lack of intrinsic factor is most commonly due to an autoimmune attack on the cells that create it in the stomach , and this condition takes the name " pernicious anemia ".
Furthermore, outside of protein quality, animal proteins also tend to have nutrients like vitamin B12 and iron that either aren’t present or are poorly absorbed when obtained from plant proteins."
Transcobalamin I (TC-1), also known as haptocorrin (HC), R-factor, and R-protein is encoded in the human by the TCN1 gene. TC-1 is a glycoprotein produced by the salivary glands of the mouth. It primarily serves to protect cobalamin (Vitamin B12) from acid degradation in the stomach by producing a HC-Vitamin B 12 complex.
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).
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