Role of Escherichia coli dnaA gene and its integrative suppression in M13 Coliphage DNA synthesis
An F/sup +/ derivative of Escherichia coli E508 thermosensitive in dnaA function (involved in DNA synthesis initiation), its revertant and an Hfr derivative of E508(ts) in which the temperature-sensitive phenotype is suppressed by integrative suppression have been compared for their ability to support M13 phage DNA synthesis at the nonpermissive temperature. Upon infection at the nonpermissive temperature, both the revertant and the Hfr strain support normal phage replication while the temperature-sensitive mutant does not. However, when infection is carried out at a permissive temperature and the temperature is shifted up after infection, phage synthesis occurs in the temperature-sensitive mutant also, but in lesser quantity than in the revertant strain. Analysis of intracellular labeled phage DNA indicates: (a) parental replicative form DNA synthesis is not dependent on dnaA function; (b) progeny replicative form DNA synthesis is strongly inhibited in the temperature-sensitive dnaA mutant at the nonpermissive temperature; (c) progeny single-strand DNA synthesis does not absolutely require dnaA function; (d) progeny single-strand DNA is present in the circular form. The implication of the host DNA replication in M13 DNA synthesis is discussed.
- Research Organization:
- Oak Ridge National Lab., TN
- OSTI ID:
- 7332114
- Journal Information:
- Eur. J. Biochem.; (United States), Vol. 67
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron microscopic studies of bacteriophage M13 DNA replication. [Escherichia coli]
Structure of nascent replicative form DNA of coliphage M13