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Substrate specificities of acid kininogenases.
Advances in Experimental Medicine and Biology
|January 1, 1979
Summary
Researchers isolated two novel acid kininogenases from bovine spleen. These enzymes, acid kininogenase I and II, exhibit distinct kinin-releasing activities and substrate specificities, offering insights into kinin metabolism.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Kinin-forming enzymes play a crucial role in physiological processes.
- Understanding the specific properties of these enzymes is essential for elucidating kinin metabolism pathways.
Purpose of the Study:
- To isolate and characterize novel kinin-forming enzymes from bovine spleen.
- To differentiate these enzymes from known cathepsins and determine their unique properties.
Main Methods:
- Enzyme extraction from bovine spleen.
- Separation using DEAE-Cellulose chromatography and polyacrylamide gel electrophoresis.
- Assays to determine kinin-releasing activity, pH optima, and substrate specificity.
Main Results:
- Two distinct acid kininogenases (I and II) were isolated and purified.
- Acid kininogenase I did not require SH compounds, while II did.
- Enzymes showed minor differences in electrophoretic behavior and pI values.
- Kininogenase I acted on high molecular weight (HMW) kininogen and also on low molecular weight (LMW) kininogen and leukokininogen.
Conclusions:
- The isolated enzymes represent novel acid kininogenases with distinct biochemical properties.
- These enzymes contribute to the understanding of kinin production and metabolism in biological systems.