| Requirement of topoisomerase IV parC and parE genes for cell cycle progression and developmental regulation in Caulobacter crescentus. | |
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MedLine Citation:
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PMID: 9426128 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We have identified the parC and parE genes encoding DNA topoisomerase IV (Topo IV) in Caulobacter crescentus. We have also characterized the effect of conditional Topo IV mutations on cell division and morphology. Topo IV mutants of C. crescentus are unlike mutants of Escherichia coli and S. typhimurium, which form long filamentous cells that are defective in nucleoid segregation and divide frequently to produce anucleate cells. Topo IV mutants of C. crescentus are highly pinched at multiple sites (cell separation phenotype) and they do not divide to produce cells lacking DNA. These results suggest unique regulatory mechanisms coupling nucleoid partitioning and cell division in this aquatic bacterium. In addition, distinctive nucleoid-partitioning defects are not apparent in C. crescentus Topo IV mutants as they are in E. coli and S. typhimurium. However, abnormal nucleoid segregation in parE mutant cells could be demonstrated in a genetic background containing a conditional mutation in the C. crescentus ftsA gene, an early cell division gene that is epistatic to parE for cell division and growth. We discuss these results in connection with the possible roles of C. crescentus Topo IV in the regulation of cell division, chromosome partitioning, and late events in polar morphogenesis. Although the ParC and ParE subunits of Topo IV are very similar in sequence to the GyrA and GyrB subunits of DNA gyrase, we have used DNA sequence analysis to identify a highly conserved 'GyrA box' sequence that is unique to the GyrA proteins and may serve as a hallmark of the GyrA protein family. |
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Authors:
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D Ward; A Newton |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Molecular microbiology Volume: 26 ISSN: 0950-382X ISO Abbreviation: Mol. Microbiol. Publication Date: 1997 Dec |
Date Detail:
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Created Date: 1998-03-05 Completed Date: 1998-03-05 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8712028 Medline TA: Mol Microbiol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 897-910 Citation Subset: IM |
Affiliation:
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Department of Molecular Biology, Princeton University, NJ 08544, USA. |
| Data Bank Information | |
Bank Name/Acc. No.:
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GENBANK/D26185; D64002; L04566; L25288; L27063; L27512; L29481; L42023; L43967; L47978; M58408; M58409; M68936; M86227; U02931; U08817; U08907; U25640; U94696; U94697; X04341; X06744; X16817; X60178; X80798; X92557; Z67739; Z67740 |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Alleles Amino Acid Sequence Bacterial Proteins / metabolism Base Sequence Caulobacter crescentus / enzymology*, genetics Cell Cycle Cloning, Molecular DNA Topoisomerase IV DNA Topoisomerases, Type II / genetics* DNA, Bacterial Escherichia coli Proteins* Genes, Bacterial* Genetic Complementation Test Molecular Sequence Data Mutagenesis Phenotype Salmonella typhimurium Sequence Homology, Amino Acid |
| Grant Support | |
ID/Acronym/Agency:
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5-T326M07312//PHS HHS |
| Chemical | |
Reg. No./Substance:
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0/Bacterial Proteins; 0/DNA, Bacterial; 0/Escherichia coli Proteins; 0/FtsA protein, Bacteria; 0/FtsA protein, E coli; EC 5.99.1.-/DNA Topoisomerase IV; EC 5.99.1.3/DNA Topoisomerases, Type II |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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