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Identification and characterization of a transcription pause site in rotavirus
J A Lawton1, M K Estes, B V Prasad
1Verna and Maars McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
Journal of Virology
|February 13, 2001
Summary
Rotavirus transcription pauses early in elongation, a step crucial for efficient RNA synthesis. This pause is reduced when capping is impaired, suggesting a regulatory role in viral replication.
Area of Science:
- Virology
- Molecular Biology
- RNA Synthesis
Background:
- Rotavirus transcription occurs within intact subviral particles.
- Nascent RNA transcripts exit through channels at icosahedral vertices.
- Understanding early transcription events is key to viral replication.
Purpose of the Study:
- Investigate early molecular events in rotavirus transcription.
- Analyze transcript length distribution post-initiation.
- Elucidate the role of transcript pausing in elongation.
Main Methods:
- High-resolution polyacrylamide gel electrophoresis.
- Analysis of transcription products at various time points.
- Manipulation of capping reaction cofactor S-adenosylmethionine.
Main Results:
- A pause in rotavirus RNA elongation occurs after 6-7 nucleotides.
- Absence of S-adenosylmethionine reduces the ratio of paused to full-length transcripts.
- Viral surface ligands like VP7 inhibit polymerase function in mature virions.
Conclusions:
- The early pause site may facilitate processive elongation.
- Inhibition by surface ligands ensures efficient transcription post-cytoplasmic entry.
- This regulation is vital for the rotavirus replication cycle.