Effect of relA function on the replication of plasmid pBR322 in Escherichia coli
β Scribed by Lin-Chao, S. ;Bremer, H.
- Publisher
- Springer
- Year
- 1986
- Tongue
- English
- Weight
- 325 KB
- Volume
- 203
- Category
- Article
- ISSN
- 0026-8925
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The in vivo role of the Escherichia coli protein DnaA in the replication of plasmid pBR322 was investigated, using a plasmid derivative carrying an inducible dnaA+ gene. In LB medium without inducer, the replication of this plasmid, like that of pBR322, was inhibited by heat inactivation of chromoso
## Abstract Fermenter studies under batch and fedβbatch conditions were carried out to test the possibility of plasmid pBR322 production in large amounts by using __E. coli relA__ strains. High amplification rates of pBR322 plasmid DNA were observed in __E. coli__ CP79 (__relA__) and __E. coli__ CP
Synthesis of both chromosomal and plasmid (pBR322) DNA was measured in E. coli strains differing in their relA allele (relA+:CP78; relA:CP79). It was found that upon limitation of a required amino acid or after valine treatment to trigger a stringent response synthesis of pBR322 DNA was stimulated o
The replication pattern of the plasmid pBR322 was examined in the dnaA mutants of Escherichia coli. The rate of pBR322 DNA synthesis is markedly decreased after dnaA cells are shifted to the restrictive temperature of 42 degrees C. However, addition of rifampicin (RIF) to cultures of dnaA strains in