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Assessment of Kidney Function in Mouse Models of Glomerular Disease
Published on: June 30, 2018
Purification and characterization of mouse kidney beta-glucuronidase
The Journal of Biological Chemistry
|June 25, 1975
Summary
Researchers purified beta-glucuronidase from mouse kidneys, achieving high specific activity and homogeneity. This purified enzyme offers insights into isoenzyme nature and hydrolase transport.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Beta-glucuronidase is a key hydrolase with important physiological roles.
- Understanding its isoenzymes is crucial for various biological processes.
Purpose of the Study:
- To purify and characterize beta-glucuronidase from gonadotrophin-induced mouse kidneys.
- To investigate the molecular properties and stability of the purified enzyme.
Main Methods:
- Enzyme purification using ultrasonication, precipitation, gel filtration, ion-exchange chromatography, and isoelectric focusing.
- Homogeneity assessment via gel filtration, SDS-PAGE, and immunodiffusion.
- Characterization of molecular weight, stability, pH optimum, and kinetic parameters (Km).
Main Results:
- Achieved a 1,090-fold purification of beta-glucuronidase with high specific activity (284,000 Fishman units/mg).
- The purified enzyme was homogeneous and identical to the lysosomal isoenzyme.
- Determined subunit (74,000 Da) and oligomer (300,000 Da) molecular weights, broad pH stability (4-11), pH optimum (4.7), and Km (1.18 x 10^-4 M).
Conclusions:
- The successful purification and characterization provide a homogeneous beta-glucuronidase preparation.
- This work advances the understanding of beta-glucuronidase isoenzyme molecular nature.
- The findings are valuable for future research on intracellular transport and distribution of this hydrolase.
