Replication of Fpoh+ plasmid in mafA mutants of Escherichia coli defective in plasmid maintenance View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1977-01

AUTHORS

Chieko Wada, Takashi Yura, Sota Hiraga

ABSTRACT

A class of F′ plasmids, designated Fpoh+, was previously shown to be able to replicate extrachromosomally on Hfr strains by virtue of carrying the specific site or region poh+ (permissive on Hfr) of the E. coli chromosome (Hiraga, 1975, 1976a). These plasmids were now found to replicate on E. coli mafA mutants (mafA1 and mafA23) that cannot support vegetative replication of F and some other F-like plasmids. The derivatives of Fpoh+ that have lost the poh+ site, on the other hand, failed to replicate on mafA mutants. These mutants harboring Fpoh+ (but not Poh- derivatives thereof) exhibit abnormal cell division and form elongated cells, presumably due to competition between Fpoh+ and the host chromosome for some factor(s) essential for the initiation of DNA replication of the both replicons. It is tentatively concluded that the poh+ site is required for F′ plasmids to replicate on mafA mutants as well as on Hfr strains. In view of the fact that the mechanism of inhibition of autonomous F DNA replication in mafA mutants and in Hfr strains are clearly different, the present data seem to provide strong support to the notion that the poh+ region contains the replication origin of the E. coli chromosome. More... »

PAGES

211-217

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00268820

DOI

http://dx.doi.org/10.1007/bf00268820

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037818249

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/327277


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