title: Evidence for polar positional information independent of cell division and nucleoid occlusion.
abstract: We present evidence that, in Escherichia coli, polar positional information is present at midcell independent of known cell division factors. In filamented cells, IcsA, which is normally polar, localizes at or near potential cell division sites. Because the cell pole is derived from the septum, the sites to which IcsA localizes in filaments correspond to future poles. IcsA localization to these sites is independent of FtsZ, MinCDE, septation, and nucleoid occlusion, indicating that positional information for the future pole is independent of cell division and chromosome positioning. Upon IcsA localization to these sites, septation is inhibited, suggesting that IcsA recognition of this polar positional information may influence cell division.
authors.affiliation: Division of Infectious Diseases, Department of Medicine, Massachusetts General Hospital/Harvard Medical School, 65 Landsdowne Street, Cambridge, MA 02139, USA.
authors.forename: Anuradha
authors.initials: A
authors.lastname: Janakiraman
authors.forename: Marcia B
authors.initials: MB
authors.lastname: Goldberg
mesh_terms: D001426:Bacterial Proteins; D002455:Cell Division; D002467:Cell Nucleus / Q000378:metabolism / Q000648:ultrastructure; D016764:Cell Polarity; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism / Q000648:ultrastructure*; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D013347:Subcellular Fractions / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C076835:FtsZ84 protein, E coli; D008164:Luminescent Proteins; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; C058483:virG protein, Shigella flexneri; D049452:Green Fluorescent Proteins