Tag: Pepsin
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The lactating birds and the bees (gastrin, pepsin, etc)
Crop milk is a secretion from the lining of the crop of parent birds that is regurgitated to young birds. It is found among all pigeons and doves where it is referred to as pigeon milk. An analog to crop milk is also secreted from the esophagus of flamingos and the male emperor penguin. Description Crop milk bears little physical resemblance to mammalian milk. Crop milk is a…
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Pepsinogens are mainly grouped in 5 different groups based on their primary structure
1. Pepsinogen A (also called pepsinogen I) 2. Pepsinogen B 3. Progastricsin (also called pepsinogen II and pepsinogen C) 4. Prochymosin (also called prorennin) 5. Pepsinogen F (also called pregnancy-associated glycoprotein).
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Nepenthesin (and the carnivorous plants it comes from)
Nepenthesin (also spelled nepenthacin or nepenthasin) is an aspartic protease of plant origin that has so far been identified in the pitcher secretions of Nepenthes and in the leaves of Drosera peltata. Discovery In the late 19th century, Sydney Howard Vines showed that the pitcher fluid from Nepenthes could digest protein in acidic conditions. He suggested the plants were making a digestive enzyme, for which he proposed the name “nepenthin”. In…
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Rennet
For the apple varieties, see Reinette Rennet is a complex set of enzymes produced in the stomachs of ruminant mammals. Chymosin, its key component, is a protease enzyme that curdles the casein in milk. In addition to chymosin, rennet contains other enzymes, such as pepsin and a lipase. Rennet has traditionally been used to separate milk into solid curds and liquid whey, used in the production of cheeses. Rennet from calves has become less common for this use, to the…
