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2. B vitamins - Wikipedia

   en.wikipedia.org/wiki/B_vitamins

   Vitamin B 17: pseudoscientific name for the poisonous compound amygdalin, also known as the equally pseudoscientific name "nitrilosides" despite the fact that it is a ...

3. Transcobalamin - Wikipedia

   en.wikipedia.org/wiki/Transcobalamin

   It primarily serves to protect cobalamin (Vitamin B12) from acid degradation in the stomach by producing a HC-Vitamin B 12 complex. Once the complex has traveled to the more pH-neutral duodenum, pancreatic proteases degrade haptocorrin, releasing free cobalamin, which now binds to intrinsic factor for absorption by ileal enterocytes.

4. Vitamin B12 total synthesis - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B12_total_synthesis

   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.

5. Haptocorrin - Wikipedia

   en.wikipedia.org/wiki/Haptocorrin

   The same cells in the stomach that produce gastric hydrochloric acid, the parietal cells, also produce a molecule called the intrinsic factor (IF), which binds the B 12 after its release from haptocorrin by digestion, and without which only 1% of vitamin B 12 is absorbed. Intrinsic factor (IF) is a glycoprotein, with a molecular weight of 45 kDa.

6. Vitamin B12 - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B12

   Vitamin B 12 is derived from a tetrapyrrolic structural framework created by the enzymes deaminase and cosynthetase which transform aminolevulinic acid via porphobilinogen and hydroxymethylbilane to uroporphyrinogen III. The latter is the first macrocyclic intermediate common to heme, chlorophyll, siroheme and B 12 itself.

7. Corrin - Wikipedia

   en.wikipedia.org/wiki/Corrin

   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.