zymogen
Học thuậtThân thiện
Definition
Noun: A biologically inactive protein compound that is a precursor to an enzyme. It requires a specific biochemical change, such as cleavage of a peptide fragment, to become the active enzyme.
Usage
A zymogen is a storage or safety form of an enzyme, preventing it from acting prematurely or in the wrong location within an organism. - Pepsinogen is the zymogen secreted by the stomach, which is activated to pepsin in the acidic gastric environment. - Trypsinogen, the zymogen for trypsin, is activated in the small intestine.
Advanced Usage
- Zymogen Granule: A cellular vesicle that stores and transports zymogens before secretion.
- The zymogen granules in pancreatic acinar cells contain digestive enzyme precursors.
- The process of converting a zymogen into its active form is called zymogen activation or proteolytic cleavage.
Variants and Related Words
- Proenzyme: A direct synonym for zymogen.
- Enzyme Precursor: A descriptive term for a zymogen.
Synonyms
- Proenzyme
- Enzyme precursor
- Inactive precursor
Related Concepts
- Activation: The process by which a zymogen becomes an active enzyme.
- Proteolysis: The cleavage of peptide bonds, which is often the mechanism for zymogen activation.
Noun
- any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active