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Rat hepatic glutaminase: purification and immunochemical characterization
Archives of Biochemistry and Biophysics
|February 1, 1988
Summary
Researchers purified phosphate-activated glutaminase from diabetic rat liver, finding increased enzyme protein concentration. Antibodies to this enzyme aid in studying its long-term regulation.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Phosphate-activated glutaminase is crucial in amino acid metabolism.
- Understanding its regulation in diabetes is important for metabolic research.
Purpose of the Study:
- To develop a purification method for phosphate-activated glutaminase from streptozotocin-diabetic rat liver.
- To characterize the purified enzyme and investigate its concentration in diabetic liver.
Main Methods:
- Enzyme purification involving sonication, precipitation, and sequential chromatography.
- Enzyme characterization including molecular mass, Km, and pH optimum determination.
- Antibody generation and application in immunoblots and enzyme inhibition assays.
Main Results:
- The enzyme was purified 600-fold with a specific activity of 31-57 U/mg.
- Purified enzyme exhibited a subunit molecular mass of 58,000-Da and kinetic properties similar to normal rat liver enzyme.
- Antibodies confirmed increased glutaminase protein concentration in diabetic rat liver without altering specific activity.
Conclusions:
- A robust method for purifying hepatic glutaminase from diabetic rats was established.
- The findings suggest altered protein expression, not activity, of glutaminase in diabetic liver.
- Generated antibodies are valuable tools for studying glutaminase regulation.