The bacteriophage P1 hot gene, encoding a homolog of the E. coli DNA polymerase III θ subunit, is expressed during both lysogenic and lytic growth stages
| Autor: | Roel M. Schaaper, Anna K. Chikova |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Genes
Viral DNA polymerase Health Toxicology and Mutagenesis Kanamycin Resistance Gene Expression DNA-Directed DNA Polymerase Virus Replication Article RNA polymerase III dnaQ Gene product Viral Proteins Plasmid Lysogenic cycle Escherichia coli Genetics Bacteriophage P1 Lysogeny Molecular Biology Gene DNA Polymerase III DNA Primers Base Sequence biology Escherichia coli Proteins Molecular biology Lytic cycle Genes Bacterial DNA Viral Mutation biology.protein |
| Zdroj: | Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis. 624:1-8 |
| ISSN: | 0027-5107 |
| Popis: | The bacteriophage P1 hot gene product is a homolog of the theta subunit of E. coli DNA polymerase III. Previous studies with hot cloned on a plasmid have shown that Hot protein can substitute for theta, as evidenced by its stabilizing effect on certain dnaQ mutator mutants carrying an unstable pol III proofreading subunit (epsilon subunit). These results are consistent with Hot, like theta, being a replication protein involved in stabilizing the intrinsically unstable epsilon proofreading function. However, the function of hot for the viral life cycle is less clear. In the present study, we show that the hot gene is not essential. Based on its promoter structure, hot has been previously classified as a "late" phage gene, a property that is not easily reconciled with a presumed replication function. Here, we clarify this issue by demonstrating that P1 hot is actively expressed both during the lysogenic state and in the early stages of a lytic induction, in addition to its expression in the late stage of phage development. The results indicate that P1 hot has a complex expression pattern, compatible with a model in which Hot may affect the host replication machinery to benefit overall phage replication. |
| Databáze: | OpenAIRE |
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