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RNA Isolation from Mouse Pancreas: A Ribonuclease-rich Tissue
Published on: August 2, 2014
PURIFICATION AND PROPERTIES OF DESOXYRIBONUCLEASE ISOLATED FROM BEEF PANCREAS
1United States Navy Research Unit at the Hospital of The Rockefeller Institute for Medical Research.
The Journal of General Physiology
|October 30, 2009
Summary
Researchers purified beef pancreas desoxyribonuclease (DNase), a highly active enzyme crucial for DNA degradation. This DNase requires specific ions for activation and is inhibited by antibodies, offering insights into enzyme function and potential therapeutic applications.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Desoxyribonuclease (DNase) plays a critical role in DNA metabolism and degradation.
- Purification of active and stable enzyme preparations is essential for biochemical studies.
Purpose of the Study:
- To describe a method for the isolation and purification of desoxyribonuclease from beef pancreas.
- To characterize the activity, stability, and requirements of the purified enzyme.
Main Methods:
- Enzyme isolation from beef pancreas using a 0.25 N sulfuric acid extract.
- Activity assay via a viscosimetric method with calf thymus sodium desoxyribonucleate.
- Assessment of enzyme purity and presence of contaminating activities (proteolytic, ribonuclease, lipase, phosphatase).
Main Results:
- A method for purifying active desoxyribonuclease was established.
- The enzyme exhibited high activity, with inactivation in dilute solutions requiring protective agents (gelatin, peptone).
- Purified desoxyribonuclease showed no ribonuclease, lipase, or phosphatase activity but contained trace proteolytic enzyme; it required Mg2+ or Mn2+ for activation and was inhibited by citrate and specific antibodies.
Conclusions:
- A stable and highly active desoxyribonuclease was successfully isolated and purified from beef pancreas.
- The enzyme's properties, including cofactor requirements and inhibition by specific antibodies, were elucidated.
- This purified desoxyribonuclease serves as a valuable tool for biochemical research and potential therapeutic applications.
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