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Intracellular Locations of Replication Proteins and the Origin of Replication during Chromosome Duplication in the Slowly Growing Human Pathogen Helicobacter pylori
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Microbiology.
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2014 (English)In: Journal of Bacteriology, ISSN 0021-9193, E-ISSN 1098-5530, Vol. 196, no 5, 999-1011 p.Article in journal (Refereed) Published
Abstract [en]

We followed the position of the replication complex in the pathogenic bacterium Helicobacter pylori using antibodies raised against the single-stranded DNA binding protein (HpSSB) and the replicative helicase (HpDnaB). The position of the replication origin, oriC, was also localized in growing cells by fluorescence in situ hybridization (FISH) with fluorescence-labeled DNA sequences adjacent to the origin. The replisome assembled at oriC near one of the cell poles, and the two forks moved together toward the cell center as replication progressed in the growing cell. Termination and resolution of the forks occurred near midcell, on one side of the septal membrane. The duplicated copies of oriC did not separate until late in elongation, when the daughter chromosomes segregated into bilobed nucleoids, suggesting sister chromatid cohesion at or near the oriC region. Components of the replication machinery, viz., HpDnaB and HpDnaG (DNA primase), were found associated with the cell membrane. A model for the assembly and location of the H. pylori replication machinery during chromosomal duplication is presented.

Place, publisher, year, edition, pages
2014. Vol. 196, no 5, 999-1011 p.
National Category
Cell and Molecular Biology
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URN: urn:nbn:se:uu:diva-223541DOI: 10.1128/JB.01198-13ISI: 000332628000010OAI: oai:DiVA.org:uu-223541DiVA: diva2:713587
Available from: 2014-04-23 Created: 2014-04-22 Last updated: 2017-12-05Bibliographically approved

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Dasgupta, Santanu

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