PMID: 16523699Mar 10, 2006Paper

S-DNA is oversupercoiled DNA with 1.94-2.19 A rise per base pair along duplex axis

Molekuliarnaia biologiia
L A Limanskaia, A P Limanskiĭ

Abstract

Supercoiled pGEMEX DNA with length of 3993 nucleotides was immobilized on four substrates (freshly cleaved mica, standard amino mica, modified amino mica with increased and decreased surface charge density compared with standard amino mica) and it was visualized by atomic force microscopy (AFM) in air. Plectonomically supercoiled DNA molecules as well as single molecules with extremely high level of compaction (i.e. molecules with significantly higher superhelix density values on comparison with previously experimentally measured and theoretically investigated ones) were visualized on modified amino mica which was characterized by increased surface charge density. Distance between base pairs along duplex axis was determined by measurements of contour length of single oversupercoiled DNA molecules. Determined rise per base pair was varied from 1.94 to 2.19 A. These compressed supercoiled DNA molecules like a spring with decreased rise/base pair on comparison with well-known DNA forms were called new DNA form--S-DNA. A model of S-DNA was built. Formation of the S-DNA molecules was suggested to be an intermediate stage on the compaction of the single supercoiled DNA molecules up to the spheroids and minitoroids. Oversupercoiling a...Continue Reading

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Citations

Aug 16, 2008·Molekuliarnaia biologiia·O Iu Limanskaia, A P Limanskiĭ
Mar 18, 2015·Nature·Brian P H MetzgerPatricia J Wittkopp
May 31, 2013·Mikrobiologiia·O Iu LimanskaiaA P Limanskiĭ

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