Document Detail


FtsZ ring formation without subsequent cell division after replication runout in Escherichia coli.
MedLine Citation:
PMID:  10931285     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In this report, we have investigated cell division after inhibition of initiation of chromosome replication in Escherichia coli. In a culture grown to the stationary phase, cells containing more than one chromosome were able to divide some time after restart of growth, under conditions not allowing initiation of chromosome replication. This shows that there is no requirement for cell division to take place within a certain time after initiation of chromosome replication. Continued growth without initiation of replication resulted in filamented cells that generally did not have any constrictions. Interestingly, FtsZ rings were formed in a majority of these cells as they reached a certain cell length. These rings appeared and were maintained for some time at the cell quarter positions on both sides of the centrally localized nucleoid. These results confirm previous findings that cell division sites are formed independently of chromosome replication and indicate that FtsZ ring assembly is dependent on cell size rather than on the capacity of the cell to divide. Disruption of the mukB gene caused a significant increase in the region occupied by DNA after the replication runout, consistent with a role of MukB in chromosome condensation. The aberrant nucleoid structure was accompanied by a shift in FtsZ ring positioning, indicating an effect of the nucleoid on the positioning of the FtsZ ring. A narrow cell length interval was found, under and over which primarily central and non-central FtsZ rings, respectively, were observed. This finding correlates well with the previously observed oscillatory movement of MinC and MinD in short and long cells.
Authors:
B Gullbrand; K Nordström
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Molecular microbiology     Volume:  36     ISSN:  0950-382X     ISO Abbreviation:  Mol. Microbiol.     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-12-01     Completed Date:  2000-12-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8712028     Medline TA:  Mol Microbiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1349-59     Citation Subset:  IM    
Affiliation:
Department of Cell and Molecular Biology, Biomedical Center, Uppsala University, Sweden.
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MeSH Terms
Descriptor/Qualifier:
Bacterial Proteins / metabolism*,  physiology
Cell Division
Chromosomal Proteins, Non-Histone*
Chromosomes, Bacterial
Cytoskeletal Proteins*
DNA Replication*
DNA, Bacterial*
Escherichia coli / cytology,  genetics*,  growth & development,  metabolism
Escherichia coli Proteins*
Time Factors
Chemical
Reg. No./Substance:
0/Bacterial Proteins; 0/Chromosomal Proteins, Non-Histone; 0/Cytoskeletal Proteins; 0/DNA, Bacterial; 0/Escherichia coli Proteins; 0/FtsZ protein, Bacteria; 0/MukB protein, E coli

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