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Trypsin inhibitor is present in various foods such as soybeans, grains, cereals and various additional legumes. [10] The main function of trypsin inhibitors in these foods is to act as a defense mechanism. By having this harmful component wild animals learn that any food that contains trypsin inhibitor is a food to avoid.
Two types of trypsin inhibitors are found in soy: the Kunitz-type soybean trypsin inhibitor (STI, discovered by Moses Kunitz and sometimes abbreviated as KTI) and the Bowman-Birk inhibitor (BBI). STI is a large (20,100 daltons), strong inhibitor of trypsin, while BBI is much smaller (8,000 daltons) and inhibits both trypsin and chymotrypsin. [3]
Protease inhibitors are substances that inhibit the actions of trypsin, pepsin, and other proteases in the gut, preventing the digestion and subsequent absorption of protein. For example, Bowman–Birk trypsin inhibitor is found in soybeans. [7] Some trypsin inhibitors and lectins are found in legumes and interfere with digestion. [8]
Monitor peptide, also known as pancreatic secretory trypsin inhibitor I (PSTI-I) or pancreatic secretory trypsin inhibitor 61 (PSTI-61), is a peptide that plays an important role in the regulation of the digestive system, specifically the release of cholecystokinin (CCK).
There are certain inhibitors that resemble the tetrahedral intermediate, and thus fill up the active site, preventing the enzyme from working properly. Trypsin, a powerful digestive enzyme, is generated in the pancreas. Inhibitors prevent self-digestion of the pancreas itself.
Kazal inhibitors, which inhibit a number of serine proteases (such as trypsin and elastase), belong to family of proteins that includes pancreatic secretory trypsin inhibitor; avian ovomucoid; acrosin inhibitor; and elastase inhibitor. These proteins contain between 1 and 7 Kazal-type inhibitor repeats. [4] [5]
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Sunflower trypsin inhibitor-1 is a potent Bowman-Birk inhibitor. Sunflower trypsin inhibitor-1 is the simplest cysteine-rich peptide scaffold because it is a bicyclic 14 amino acid peptide and only has one disulfide bond. The disulfide bond divides the peptide into two loops. One loop is a functional trypsin inhibitory and the second loop is a ...