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- Title
Atomic Force Microscopy Analysis of the Role of Major DNA-Binding Proteins in Organization of the Nucleoid in <i>Escherichia coli</i>.
- Authors
Ohniwa, Ryosuke L.; Muchaku, Hiroki; Saito, Shinji; Wada, Chieko; Morikawa, Kazuya
- Abstract
Bacterial genomic DNA is packed within the nucleoid of the cell along with various proteins and RNAs. We previously showed that the nucleoid in log phase cells consist of fibrous structures with diameters ranging from 30 to 80 nm, and that these structures, upon RNase A treatment, are converted into homogeneous thinner fibers with diameter of 10 nm. In this study, we investigated the role of major DNA-binding proteins in nucleoid organization by analyzing the nucleoid of mutant Escherichia coli strains lacking HU, IHF, H–NS, StpA, Fis, or Hfq using atomic force microscopy. Deletion of particular DNA-binding protein genes altered the nucleoid structure in different ways, but did not release the naked DNA even after the treatment with RNase A. This suggests that major DNA-binding proteins are involved in the formation of higher order structure once 10-nm fiber structure is built up from naked DNA.
- Subjects
ATOMIC force microscopy; DNA-binding proteins; NUCLEOIDS; BACTERIAL genomes; RIBONUCLEASES; DELETION mutation; ESCHERICHIA coli
- Publication
PLoS ONE, 2013, Vol 8, Issue 8, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0072954