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The interactions of enzyme and chemical probes with inverted repeats in supercoiled DNA.

Abstract：

:In negatively supercoiled DNA molecules some inverted repeat sequences adopt a perturbed conformation which is characterised by the following properties. They are centrally hypersensitive to single-strand-specific nucleases such as S1, and to a much lower extent the flanking regions may also be sensitive. They are also hypersensitive to modification by bromoacetaldehyde, particularly in their flanking region. They may be resistant to endonucleolysis by restriction enzymes and are cleaved (resolved) by a T4 resolving enzyme. All these properties can only be consistently explained by a model in which the inverted repeat adopts a cruciform structure. This property has been shown to depend sharply on a superhelix density, and the transition to nuclease sensitivity is accompanied by a marked alteration in the overall molecular geometry as judged by frictional properties. The probable dynamics of these structures are discussed.

journal_name

J Biomol Struct Dyn

journal_title

Journal of biomolecular structure & dynamics

authors

Lilley DM,Hallam LR

doi

10.1080/07391102.1983.10507433

subject

Has Abstract

pub_date

1983-10-01 00:00:00

pages

169-82

issue

1

eissn

0739-1102

issn

1538-0254

journal_volume

1

pub_type

杂志文章,评审

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