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Avian myeloblastosis reverse transcriptase deacylates tryptophanyl-tRNA
Nucleic Acids Research
|November 25, 1982
Summary
Tryptophanyl-tRNA serves as a primer for avian reverse transcriptase. Avian retroviral polymerase and viral RNA together efficiently hydrolyze the ester linkage in Trp-tRNATrp.
Area of Science:
- Molecular Biology
- Virology
- Biochemistry
Background:
- Tryptophanyl-tRNA (Trp-tRNATrp) is known to prime RNA-dependent DNA synthesis by avian reverse transcriptase.
- The avian retroviral polymerase's intrinsic ability to deacylate Trp-tRNATrp has been a subject of investigation.
Purpose of the Study:
- To investigate the role of avian retroviral polymerase and viral RNA in the deacylation of Tryptophanyl-tRNA.
- To understand the mechanism of primer utilization in reverse transcription.
Main Methods:
- Enzymatic assays were performed to assess the deacylation of Trp-tRNATrp by avian retroviral polymerase.
- The influence of viral 35 S RNA on the deacylation process was examined.
Main Results:
- Avian retroviral polymerase alone does not efficiently deacylate Trp-tRNATrp.
- The presence of both the polymerase and viral 35 S RNA leads to highly efficient hydrolysis of the ester linkage between tryptophan and the ribose moiety of tRNATrp.
Conclusions:
- Avian retroviral polymerase requires viral RNA to effectively cleave the primer tRNA.
- This interaction is crucial for the initiation of reverse transcription by avian retroviral reverse transcriptase.