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. 1988 Jun 24;16(12):5473–5490. doi: 10.1093/nar/16.12.5473

Intermediate range effects in DNA. I: Low pH/stress induced conformational changes in the vicinity of an extruded d(AT)n.d(AT) in cruciform.

J N Glover 1, D B Haniford 1, D E Pulleyblank 1
PMCID: PMC336779  PMID: 3387239

Abstract

A family of plasmids which contain d(AT)n cruciforms are sensitive to "single strand specific" (SS) endonucleases and a variety of chemical probes in a "random sequence" region centered 10-30 residues away from the cruciform junction. The SS nuclease sensitive structures are dependent on the presence of the extruded cruciform and exhibit a degree of sequence independence. Their appearance depends upon the combined effects of slightly lower than neutral pH and superhelical coiling above the minimum required to drive the extrusion of the d(AT)n cruciform arms. The nuclease sensitive structure is therefore underwound with respect to the B conformation and contains protonated bases.

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