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Team:Imperial College London/Stomach
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* Released by chief cells in the stomach. | * Released by chief cells in the stomach. | ||
Revision as of 16:39, 28 September 2009
Human Digestive Proteases:
- Pepsin = stomach
- Trypsin = duodenum
- Chymotrypsin
- Carboxypeptidase
Pepsin
- Released by chief cells in the stomach.
- Expressed as a zymogen pepsinogen.
- Pepsinogen is converted to pepsin by HCl which is released by parietal cells of the stomach.
- Cleaves at the N-terminus after aromatic amino acids such as phenylalanine, tryptophan, and tyrosine.
- Optimum pH of 1.5 to 2. Pepsin denatures when the pH is more than 5.0.
Stomach = two types of pepsins (these are activated from zymogen precursors at acidic pH).
Duodenum = Endopeptidases (trypsin, chymotryopsin, elastase)
Exopeptidases (carboxypeptidases A & B)
Enteropeptidase
Small Intestine = Aminopeptidase N
Dipeptidyl aminopeptidase IV
Aminopeptidase P
Carboxypeptidase P
Angotensin-converting enzyme
Glutamyl aminopeptidase
