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DNA replication studies with coliphage 186. II. Depression of host replication by a 186 gene
1Scripps Clinic and Medical Foundation, La Jolla, CA 92037.
Journal of Molecular Biology
|March 5, 1989
Abstract:
Using pre-labelling rather than pulse-labelling studies to determine rates of replication, we have shown that coliphage 186 infection is accompanied by a depression in host DNA replication. We have isolated mutants of the phage gene involved and mapped them in the early region of the phage genome. Sequencing the mutants ultimately led us to the identification of the gene that we have named the dhr gene.
Insights
Coliphage 186 infection depresses host DNA replication. Researchers identified a specific gene, the dhr gene, responsible for this effect by analyzing phage mutants.
Area of Science:
- Microbiology
- Molecular Biology
- Virology
Background:
- Bacteriophages, viruses that infect bacteria, can significantly alter host cell processes.
- Understanding phage-host interactions is crucial for deciphering viral replication strategies and host manipulation mechanisms.
Purpose of the Study:
- To investigate the impact of coliphage 186 infection on host DNA replication.
- To identify the specific phage gene responsible for modulating host DNA replication.
Main Methods:
- Utilizing pre-labelling techniques to quantify host DNA replication rates during phage infection.
- Isolation and genetic mapping of coliphage 186 mutants affecting host DNA replication.
- DNA sequencing of isolated mutants to pinpoint the responsible gene.
Main Results:
- Coliphage 186 infection leads to a notable decrease in host DNA replication.
- Mutants were isolated and mapped to the early region of the coliphage 186 genome.
- Sequencing identified a novel gene, designated the dhr gene, involved in this process.
Conclusions:
- The dhr gene of coliphage 186 plays a critical role in suppressing host DNA replication during infection.
- This finding provides insight into the molecular mechanisms by which bacteriophages control host cellular machinery.