Linked Life Data

9465027

Source:http://linkedlifedata.com/resource/pubmed/id/9465027

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pubmed-article:9465027pubmed:abstractTextWe demonstrate the use of a DNA minicircle competition binding assay, together with DNA cyclization kinetics and gel-phasing methods, to show that the DNA-binding domains (dbd) of the heterodimeric leucine zipper protein Fos-Jun do not bend the AP-1 target site. Our DNA constructs contain an AP-1 site phased by 1-4 helical turns against an A-tract-directed bend. Competition binding experiments reveal that (dbd)Fos-Jun has a slight preference for binding to linear over circular AP-1 DNAs, independent of whether the site faces in or out on the circle. This result suggests that (dbd)Fos-Jun slightly stiffens rather than bends its DNA target site. A single A-tract bend replacing the AP-1 site is readily detected by its effect on cyclization kinetics, in contrast to the observations for Fos-Jun bound at the AP-1 locus. In contrast, comparative electrophoresis reveals that Fos-Jun-DNA complexes, in which the A-tract bend is positioned close (1-2 helical turns) to the AP-1 site, show phase-dependent variations in gel mobilities that are comparable with those observed when a single A-tract bend replaces the AP-1 site. Whereas gel mobility variations of Fos-Jun-DNA complexes decrease linearly with increasing Mg2+ contained in the gel, the solution binding preference of (dbd)Fos-Jun for linear over circular DNAs is independent of Mg2+ concentration. Hence, gel mobility variations of Fos-Jun-DNA complexes are not indicative of (dbd)Fos-Jun-induced DNA bending (upper limit 5 degrees) in the low salt conditions of gel electrophoresis. Instead, we propose that the gel anomalies depend on the steric relationship of the leucine zipper region with respect to a DNA bend.lld:pubmed
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pubmed-article:9465027pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:9465027pubmed:articleTitleDNA-binding domains of Fos and Jun do not induce DNA curvature: an investigation with solution and gel methods.lld:pubmed
pubmed-article:9465027pubmed:affiliationDepartment of Chemistry, 225 Prospect Street, Yale University, New Haven, CT 06511, USA.lld:pubmed
pubmed-article:9465027pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9465027pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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