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Properties of 2'5' oligoadenylate synthetase
Annals of the New York Academy of Sciences
|January 1, 1980
Summary
Researchers purified 2'5' Oligoadenylate synthetase from rabbit reticulocyte lysate, developing a new assay to study its properties. The enzyme synthesizes oligoadenylates with non-processive elongation, incorporating various nucleotides.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- 2'5' Oligoadenylate synthetase is a key enzyme in the interferon-induced antiviral pathway.
- Understanding its purification and properties is crucial for studying its biological role.
Purpose of the Study:
- To purify 2'5' Oligoadenylate synthetase from rabbit reticulocyte lysate.
- To develop a rapid and quantitative assay for enzyme activity.
- To characterize the enzyme's biochemical properties and catalytic mechanism.
Main Methods:
- Purification using DEAE-cellulose and rI:rC-agarose chromatography, and ammonium sulfate precipitation.
- Development of a quantitative assay based on TLC with PEI-cellulose for separating ATP and 2'5' oligoadenylates.
- Characterization of enzyme kinetics, substrate specificity, and product distribution.
Main Results:
- The enzyme was purified to a specific activity of 37 units/mg protein.
- Optimal activity was observed at pH 8 with 20 mM Mg++.
- The enzyme exhibited non-processive elongation, producing mainly dimers, trimers, and tetramers, and could incorporate GTP and UTP alongside ATP.
Conclusions:
- A robust method for purifying and assaying 2'5' Oligoadenylate synthetase was established.
- The enzyme's catalytic mechanism appears dissipative, with limited processivity in oligomer elongation.
- The enzyme demonstrates flexibility in nucleotide incorporation, suggesting broader roles in oligonucleotide synthesis.