Related Experiment Videos
Proofreading function associated with the RNA-dependent RNA polymerase from influenza virus
The Journal of Biological Chemistry
|August 5, 1986
Summary
Influenza virus RNA polymerase cleaves capped RNA and initiates transcription with GMP. Excess GMP is removed by CTP, suggesting a proofreading function for the RNA-dependent RNA polymerase.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Influenza virus RNA polymerase is essential for viral transcription and replication.
- Transcription initiation involves endonucleolytic cleavage of capped RNA and primer extension.
Purpose of the Study:
- To investigate the mechanism of transcription initiation by the influenza virus RNA polymerase.
- To determine if the RNA-dependent RNA polymerase possesses a proofreading capability.
Main Methods:
- In vitro assays using influenza virus RNA polymerase.
- Analysis of RNA synthesis products with varying substrate concentrations (GTP, CTP).
Main Results:
- The polymerase cleaves capped RNA and initiates transcription by adding GMP.
- In the presence of high GTP, multiple GMPs were added.
- CTP addition led to the removal of excess GMP residues before elongation.
Conclusions:
- The influenza virus RNA-dependent RNA polymerase exhibits a proofreading function during transcription initiation.
- This proofreading mechanism may enhance the fidelity of viral RNA synthesis.