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The bacteriophage P1 lytic replicon: directionality of replication and cis-acting elements
1Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, University of Tel-Aviv, Ramat Aviv, Israel.
Gene
|October 10, 1996
Summary
Bacteriophage P1 lytic replication proceeds bidirectionally. The P53 promoter or repL protein likely functions in cis, meaning it acts locally, to enable replication.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- Bacteriophage P1 is a model organism for studying viral replication.
- Understanding the mechanisms of viral DNA replication is crucial for controlling viral infections.
Purpose of the Study:
- To determine the direction of bacteriophage P1 lytic replication.
- To investigate the functional role of the P53 promoter and repL gene in P1 lytic replication.
Main Methods:
- Construction of lambda P1 lysogens containing a functional P1 lytic replicon.
- Analysis of bacterial DNA marker amplification to infer replication direction.
- Complementation assays using wild-type and mutant P1 replicons with transposon insertions.
Main Results:
- Bacterial DNA markers flanking the lambda prophage were coordinately amplified, indicating bidirectional lytic replication.
- A wild-type P1 replicon could not complement a mutant replicon with a transposon insertion between the P53 promoter and the repL gene.
Conclusions:
- Bacteriophage P1 lytic replication occurs in a bidirectional manner.
- The P53 promoter and/or the repL protein likely function in cis to facilitate P1 lytic replication.