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Pepsin / ˈ p ɛ p s ɪ n / is an endopeptidase that breaks down proteins into smaller peptides and amino acids. It is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food. Pepsin is an aspartic protease, using a catalytic aspartate in its active site. [2]
Principal known actions Bombesin: Throughout the gut and pancreas: Stimulates release of cholecystokinin (CCK) and gastrin Calcitonin gene-related peptide: Enteric nerves: Unclear Chromogranin A: Neuroendocrine cells: Secretory protein Enkephalins: Stomach, duodenum: Opiate-like actions Enteroglucagon: Small intestine, pancreas: Inhibits ...
A prime example of this is pepsin, which is secreted in the stomach by chief cells. Pepsin in its secreted form is inactive . However, once it reaches the gastric lumen it becomes activated into pepsin by the high H+ concentration, becoming an enzyme vital to digestion. The release of the enzymes is regulated by neural, hormonal, or paracrine ...
n/a Ensembl ENSG00000229859 n/a UniProt P0DJD8 n/a RefSeq (mRNA) NM_001079807 n/a RefSeq (protein) NP_001073275 n/a Location (UCSC) Chr 11: 61.2 – 61.21 Mb n/a PubMed search n/a Wikidata View/Edit Human Pepsinogen 3, group I (pepsinogen A) is a protein that in humans is encoded by the PGA3 gene. Function This gene encodes a protein precursor of the digestive enzyme pepsin, a member of the ...
Pepsinogen is a precursor enzyme produced by the gastric chief cells, and gastric acid activates this to the enzyme pepsin which begins the digestion of proteins. As these two chemicals would damage the stomach wall, mucus is secreted by innumerable gastric glands in the stomach, to provide a slimy protective layer against the damaging effects ...
This type of cell also secretes gastric lipase enzymes, which help digest triglycerides into free fatty acids and di- and mono-glycerides. [3] There is also evidence that the gastric chief cell secretes leptin in response to the presence of food in the stomach. Leptin has been found in the pepsinogen granules of chief cells. [4]
The corresponding specific proteins expressed in stomach are mainly involved in creating a suitable environment for handling the digestion of food for uptake of nutrients. Highly stomach-specific proteins include gastrokine-1 expressed in the mucosa; pepsinogen and gastric lipase , expressed in gastric chief cells ; and a gastric ATPase and ...
In some plants, the leaf collapses on the prey to increase contact, others have a small vessel of digestive liquid. Then digestion fluids are used to digest the prey to get at the needed nitrates and phosphorus. The absorption of the needed nutrients are usually more efficient than in other plants.
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