Cell cycle synchronization of Escherichia coli using the stringent response, with fluorescence labeling assays for DNA content and replication.

Cell cycle synchronization of Escherichia coli using the stringent response, with fluorescence labeling assays for DNA content and replication.
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DOI:
10.1016/j.ymeth.2009.02.010
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发表时间:
2009-05
期刊:
影响因子:
4.8
通讯作者:
Lovett, Susan T.
Lovett, Susan T.
中科院分区:
生物学3区
文献类型:
--
作者:
Ferullo, Daniel J.;Cooper, Deani L.;Moore, Hayley R.;Lovett, Susan T.

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We describe a method for synchronization of the cell cycle in the bacterium E. coli. Treatment of asynchronous cultures with the amino acid analog, DL-serine hydroxamate, induces the stringent response, with concomitant arrest of DNA replication at initiation. Following release of the stringent response, cells initiate DNA replication in synchrony, as determined by flow cytometry for DNA content, Southern blotting and microscopy. This method has the advantage that it can be used in fully wild-type cells, at different growth rates, and may be applicable to other bacterial species with replication control by the stringent response. We also elaborate other methods useful for establishing cell cycle parameters in bacterial populations. We describe flow cytometric methods for analyzing bacterial populations for DNA content using the DNA-specific dye PicoGreen, readily detected by most commercial flow cytometers. We also present an method for incorporation of the nucleotide ethynyl-deoxyuridine, EdU, followed by “click” labeling with fluorescent dyes, which allows us to measure and visualize newly replicated DNA in fixed E. coli K-12 cells under non-denaturing conditions.
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