Source:http://linkedlifedata.com/resource/pubmed/id/20633229
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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
5
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pubmed:dateCreated |
2010-11-8
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pubmed:abstractText |
The Escherichia coli curved DNA-binding protein A (CbpA) is a nucleoid-associated DNA-binding factor and chaperone that is expressed at high levels as cells enter stationary phase. Using a combination of genetics, biochemistry, structural modelling and single-molecule atomic force microscopy we have examined dimerization of, and DNA binding by, CbpA. Our data show that CbpA dimerization is driven by a hydrophobic surface comprising amino acid side chains W287 and L290 located on the same side of an ? helix close to the C-terminus of CbpA. Derivatives of CbpA that are unable to dimerize are also unable to bind DNA. Free in solution, CbpA can exist as either a monomer or dimer. However, when bound to DNA, CbpA forms large aggregates that can protect DNA from degradation by nucleases. These CbpA-DNA aggregates are similar in morphology to protein-DNA complexes formed by the DNA-binding protein from starved cells (Dps), the only other stationary phase-specific nucleoid protein. Conversely, protein-DNA complexes formed by Fis, the major growth phase nucleoid protein, have a markedly different appearance.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:month |
Sep
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pubmed:issn |
1365-2958
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pubmed:author | |
pubmed:copyrightInfo |
© 2010 Blackwell Publishing Ltd.
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pubmed:issnType |
Electronic
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pubmed:volume |
77
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
1289-300
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pubmed:meshHeading | |
pubmed:year |
2010
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pubmed:articleTitle |
Dimerization and DNA-dependent aggregation of the Escherichia coli nucleoid protein and chaperone CbpA.
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pubmed:affiliation |
Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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