Plasmid replication and partition in Escherichia coli: is the cell membrane the key?

Molecular Microbiology
W Firshein, P Kim

Abstract

The DNA-membrane complex has been the subject of intensive investigation for over 35 years as the possible site for DNA replication in the prokaryotic cell and the site through which newly synthesized chromosomes are segregated into daughter cells. However, the molecular mechanisms which control these phenomena are, for the most part, poorly understood despite genetic, biochemical, and morphologic evidence in favour of their existence. This is probably due to the transient nature and non-covalent interactions that occur between DNA and the membrane. In addition, there is a paucity of knowledge concerning the nature of the membrane receptors for DNA and whether the membrane plays simply a structural or metabolic role in the two processes. Plasmids can provide important insights into the role of the membrane in replication and partitioning because the plasmid life cycle is relatively simple, with replication occurring during the cell cycle and partitioning during cell division. The replicon model of Jacob et al. (1963, Cold Spring Harbor Symp Quant Biol 28: 329-348) still represents a good conceptual framework (with modifications) to explain how plasmid replication and partitioning are linked by the membrane. In its simplest form...Continue Reading

Citations

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