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- W1890640081 abstract "Brucella abortus is a facultative intracellular pathogen that grows unipolarly and initiates the replication of its two chromosomes in a specific order. Bacteria at the G1 stage of the cell cycle, that is, before the initiation of their chromosomal replication, are preferentially internalized in host cells. Cell-cycle progression is coordinated with trafficking in the host cell, the endosomal stage being divided into two parts: a first, long, nongrowing part, and a second part in which growth and chromosomal replication are resumed. A cell-cycle control network, conserved with the model bacterium Caulobacter crescentus, is essential for B. abortus virulence. Brucellae are facultative intracellular pathogens. The recent development of methods and genetically engineered strains allowed the description of cell-cycle progression of Brucella abortus, including unipolar growth and the ordered initiation of chromosomal replication. B. abortus cell-cycle progression is coordinated with intracellular trafficking in the endosomal compartments. Bacteria are first blocked at the G1 stage, growth and chromosome replication being resumed shortly before reaching the intracellular proliferation compartment. The control mechanisms of cell cycle are similar to those reported for the bacterium Caulobacter crescentus, and they are crucial for survival in the host cell. The development of single-cell analyses could also be applied to other bacterial pathogens to investigate their cell-cycle progression during infection. Brucellae are facultative intracellular pathogens. The recent development of methods and genetically engineered strains allowed the description of cell-cycle progression of Brucella abortus, including unipolar growth and the ordered initiation of chromosomal replication. B. abortus cell-cycle progression is coordinated with intracellular trafficking in the endosomal compartments. Bacteria are first blocked at the G1 stage, growth and chromosome replication being resumed shortly before reaching the intracellular proliferation compartment. The control mechanisms of cell cycle are similar to those reported for the bacterium Caulobacter crescentus, and they are crucial for survival in the host cell. The development of single-cell analyses could also be applied to other bacterial pathogens to investigate their cell-cycle progression during infection. contains the bacterium during intracellular trafficking. There is usually one bacterium per vacuole, and this vacuole harbours different markers, for example, Lamp1 and calnexin, that respectively allow the discrimination between endosomal BCV (eBCV) and replicative BCV (rBCV). a key stage of the cell cycle is division. After division, the newly generated cells grow. Prior to initiation of DNA replication, cells are classified as G1 bacteria or newborns. After initiation of DNA replication, cells are at the S stage of the cell cycle. The G2 stage corresponds to bacteria that have completed DNA replication but have not completed cell division. Since replication termination (ter) sites can remain associated even after the completion of their duplication [70Deghorain M. et al.A defined terminal region of the E. coli chromosome shows late segregation and high FtsK activity.PLoS ONE. 2011; 6: e22164Crossref PubMed Scopus (25) Google Scholar], it is difficult to distinguish S from G2 phases at the experimental level. the new poles are produced by cell division, while old poles exist before cell division [71Van der Henst C. et al.The Brucella pathogens are polarized bacteria.Microbes Infect. 2013; 15: 998-1004Crossref PubMed Scopus (23) Google Scholar]. In Brucella abortus, two proteins (PdhS and FumC) are known to be associated with the old pole [51Hallez R. et al.The asymmetric distribution of the essential histidine kinase PdhS indicates a differentiation event in Brucella abortus.EMBO J. 2007; 26: 1444-1455Crossref PubMed Scopus (59) Google Scholar, 72Mignolet J. et al.PdhS, an old-pole-localized histidine kinase, recruits the fumarase FumC in Brucella abortus.J. Bacteriol. 2010; 192: 3235-3239Crossref PubMed Scopus (20) Google Scholar], while others, such as IfoP, PopZ, or AidB, are mainly localized at the new pole [22Deghelt M. et al.G1-arrested newborn cells are the predominant infectious form of the pathogen Brucella abortus.Nat. Commun. 2014; 5: 4366Crossref PubMed Scopus (60) Google Scholar, 73Dotreppe D. et al.The alkylation response protein AidB is localized at the new poles and constriction sites in Brucella abortus.BMC Microbiol. 2011; 11: 257Crossref PubMed Scopus (15) Google Scholar]. are signal transduction systems composed of a least two proteins: (i) a histidine kinase (HK) that autophosphorylates on a conserved histidine residue in response to a signal, and (ii) a response regulator (RR) that catalyzes phosphotransfer from the phosphohistidine of the HK to itself, on a conserved aspartate residue. In phosphorelays, hybrid HK proteins such as CckA are frequently involved. They are composed of a classical HK domain followed by a domain typical of RR, with a conserved aspartate residue involved in phosphotransfer. A histidine phosphotransferase (like ChpT) acts as an intermediate to provide a phosphoryl group to an RR, that is often fused to a DNA-binding domain, like CtrA." @default.
- W1890640081 created "2016-06-24" @default.
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- W1890640081 date "2015-12-01" @default.
- W1890640081 modified "2023-10-03" @default.
- W1890640081 title "Brucella abortus Cell Cycle and Infection Are Coordinated" @default.
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- W1890640081 doi "https://doi.org/10.1016/j.tim.2015.09.007" @default.
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- W1890640081 hasPublicationYear "2015" @default.
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