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pepsin    
n. 胃液素,酸蛋白酶

胃液素,酸蛋白□

pepsin
n 1: an enzyme produced in the stomach that splits proteins into
peptones

Pepsin \Pep"sin\ (p[e^]p"s[i^]n), n. [Gr. pe`psis a cooking,
digesting, digestion, fr. pe`ptein, pe`ssein, to cook,
digest: cf. F. pepsine. Cf. {Dyspepsia}.] (Physiol. Chem.)
A proteolytic enzyme (MW 34,500) contained in the secretory
glands of the stomach. In the gastric juice it is united with
dilute hydrochloric acid (0.2 per cent, approximately) and
the two together constitute the active portion of the
digestive fluid. It degrades proteins to proteoses and
peptides, and is notable for having a very low pH optimum for
its activity. It is the active agent in the gastric juice of
all animals.
[1913 Webster PJC]

Note: As prepared from the glandular layer of pigs' or
calves' stomachs it constitutes an important article of
pharmacy.
[1913 Webster]

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  • Pepsin - Wikipedia
    Pepsin is an aspartic protease, using a catalytic aspartate in its active site [2] It is one of three principal endopeptidases (enzymes cutting proteins in the middle) in the human digestive system, the other two being chymotrypsin and trypsin
  • Rethinking Reflux: The Real Culprit Isn’t Acid—It’s Pepsin
    At-A-Glance The digestive enzyme pepsin, not acid, is the primary culprit behind reflux-related damage Unlike acid, pepsin sticks to tissues in the throat and airways, reactivating with acidic foods and causing long-term harm Many people with reflux don’t experience heartburn
  • Pepsin: Signs You Need This Vital Enzyme and How to Get It - Dr. Axe
    The definition of pepsin is a digestive enzyme in the stomach that breaks down proteins into smaller units called polypeptides (or peptides for short) This enzyme helps digest proteins — such as those found in meat, eggs, dairy products, nuts and seeds — by breaking bonds that link amino acids
  • Pepsin | Description, Production, Function | Britannica
    Pepsin is a powerful enzyme in gastric juice that digests proteins such as those in meat, seeds, and dairy products It is the mature active form of pepsinogen, which is released into the stomach and mixed with hydrochloric acid to produce pepsin
  • What Does Pepsin Do? Digestion and Acid Reflux - ScienceInsights
    Pepsin is a digestive enzyme in your stomach that breaks down proteins into smaller fragments It handles roughly 10 to 20 percent of total protein digestion, with the rest completed by enzymes in the small intestine
  • Pepsin - an overview | ScienceDirect Topics
    Pepsin is defined as a powerful enzyme present in gastric juice that aids in the digestion of complex food particles, produced from its proenzyme pepsinogen through reaction with hydrochloric acid (HCl) in the stomach
  • PDB-101: Molecule of the Month: Pepsin
    Our digestive system contains a host of tough, stable enzymes designed to seek out those rich holiday treats and break them into small pieces Pepsin is the first in a series of enzymes that digest proteins
  • Pepsinogens and Pepsins - Colorado State University
    On exposure to an acidic pH the activation peptide is cleaved, thereby unmasking the active site and generating catalytically-active pepsin Optimal activity of pepsins is at pH of 1 8 to 3 5, depending on the isoform
  • Pepsin: Definition, Parts of the Stomach, Function Uses
    Pepsin is a digestive enzyme that plays a crucial role in breaking down proteins in the stomach It is produced by the stomach lining as an inactive precursor called pepsinogen, which is then activated to pepsin by the acidic environment of the stomach (specifically, hydrochloric acid)





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