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DNA-dependent RNA polymerases from bovine thyroid: catalytic properties and template specificities
The International Journal of Biochemistry
|January 1, 1982
Summary
Researchers purified bovine RNA polymerases I and II, detailing their kinetics and inhibition. Polyamines were found to enhance chain elongation rates for these crucial enzymes involved in transcription.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- DNA-dependent RNA polymerases are essential enzymes responsible for transcribing DNA into RNA.
- Understanding the properties and regulation of RNA polymerases is critical for deciphering gene expression mechanisms.
Purpose of the Study:
- To purify and characterize bovine RNA polymerases I and II.
- To investigate the kinetics and optimal assay conditions for these enzymes.
- To identify factors affecting RNA polymerase activity, including inhibitors and enhancers.
Main Methods:
- Purification of RNA polymerases I and II from bovine thyroid nuclei.
- Characterization of RNA polymerase II using gel electrophoresis and amino-acid analysis.
- Kinetic studies and optimization of assay conditions.
- Investigation of DNA template efficiency.
- Assessment of rifamycin AF 013, heparin, and polyamines on enzyme activity.
Main Results:
- RNA polymerase I and II were purified with significant purification factors (230-fold and 3212-fold, respectively).
- Optimal assay conditions and kinetics for both enzymes were determined.
- Rifamycin AF 013 and heparin were identified as potent inhibitors of transcription initiation.
- Polyamines demonstrated an ability to enhance the rate of RNA chain elongation.
Conclusions:
- Bovine RNA polymerases I and II have been successfully purified and characterized.
- Specific inhibitors of initiation and enhancers of elongation were identified, providing insights into transcriptional regulation.
- This study contributes to the fundamental understanding of RNA polymerase function and its modulation.