Hepatic nucleases. 1. Methods for the specific determination and characterization in rat liver

Area of Science:

• Biochemistry
• Molecular Biology
• Enzymology

Background:

• Nucleases play crucial roles in cellular processes.
• Understanding nuclease activity is vital for studying subcellular localization.
• Rat liver is a common model for biochemical studies.

Purpose of the Study:

• To establish methods for quantifying specific nuclease activities in rat liver homogenates.
• To differentiate and measure acid, neutral, and alkaline ribonucleases.
• To determine optimal conditions for assaying deoxyribonucleases and polyriboadenylate-acting enzymes.

Main Methods:

• Differential pH incubation to separate ribonuclease activities.
• Utilizing natural inhibitors to isolate neutral ribonuclease.
• Heat and acid pre-treatment to specifically measure alkaline ribonuclease.
• Optimization of assay conditions for various nucleases.

Main Results:

• Identified three distinct ribonuclease enzymes in rat liver with different pH optima.
• Developed specific assays for acid (pH 5.3), neutral (pH 7.6), and alkaline (pH 8.8) ribonucleases.
• Described optimal conditions for assaying two deoxyribonucleases and a polyriboadenylate-acting enzyme.

Conclusions:

• The study provides reliable methods for the specific measurement of multiple nuclease activities in rat liver.
• These methods facilitate the investigation of nuclease subcellular localization and function.
• Comparative analysis of nuclease activities and properties was achieved.