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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A temperature-sensitive mutation in the dnaE gene of Caulobacter crescentus that prevents initiation of DNA replication but not ongoing elongation of DNA.

A genetic screen for cell division cycle mutants of Caulobacter crescentus identified a temperature-sensitive DNA replication mutant. Genetic complementation experiments revealed a mutation within the dnaE gene, encoding the alpha-catalytic subunit of DNA polymerase III holoenzyme. Sequencing of the temperature-sensitive dnaE allele indicated a single base pair substitution resulting in a change from valine to glutamic acid within the C-terminal portion of the protein. This mutation lies in a region of the DnaE protein shown in Escherichia coli, to be important in interactions with other essential DNA replication proteins. Using DNA replication assays and fluorescence flow cytometry, we show that the observed block in DNA synthesis in the Caulobacter dnaE mutant strain occurs at the initiation stage of replication and that there is also a partial block of DNA elongation.[1]


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