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[How and why is pepsin stable and active at pH 2?]
Molekuliarnaia Biologiia
|November 1, 1994
Summary
Mammalian stomachs contain concentrated hydrochloric acid (HCl) that denatures proteins. This study explains how the gastric epithelium avoids damage and why pepsin remains stable and active in extreme stomach conditions.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Context:
- The mammalian stomach utilizes concentrated hydrochloric acid (HCl) for protein digestion and denaturation.
- Gastric epithelium faces extreme acidic conditions (pH ~1.5-3.5) and enzymatic activity.
Purpose:
- To elucidate the mechanisms protecting the gastric epithelium from self-digestion.
- To explain the stability and activity of pepsin under harsh acidic conditions.
- To discuss the structural basis for pepsin's extraordinary properties.
Summary:
- Pepsin, the primary proteinase initiating digestion, effectively cleaves hydrophobic protein cores unfolded by acidic media.
- The three-dimensional structure of pepsin, particularly the disposition of its charged groups, confers remarkable stability and activity.
- Studies reviewed explain how the gastric lining remains undamaged despite the potent digestive environment.
Impact:
- Provides insights into enzyme adaptation to extreme environments.
- Contributes to understanding protein digestion and gastrointestinal physiology.
- Informs potential therapeutic strategies for acid-related disorders.