The influence of tertiary structural restraints on conformational transitions in superhelical DNA.

Abstract:

:This paper examines theoretically the effects that restraints on the tertiary structure of a superhelical DNA domain exert on the energetics of linking and the onset of conformational transitions. The most important tertiary constraint arises from the nucleosomal winding of genomic DNA in vivo. Conformational transitions are shown to occur at equilibrium at less extreme superhelicities in DNA whose tertiary structure is restrained than in unrestrained molecules where the residual linking difference alpha res (that part of the superhelical deformation which is not absorbed by transitions) may be freely partitioned between twisting and bending. In the extreme case of a rigidly held tertiary structure, this analysis predicts that the B-Z transition will occur at roughly half the superhelix density needed to drive the same transition in solution, other factors remaining fixed. This suggests that superhelical transitions may occur at more moderate superhelical deformations in vivo than in solution. The influence on transition behavior of the tertiary structural restraints imposed by gel conditions also are discussed.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Benham CJ

doi

10.1093/nar/15.23.9985

subject

Has Abstract

pub_date

1987-12-10 00:00:00

pages

9985-95

issue

23

eissn

0305-1048

issn

1362-4962

journal_volume

15

pub_type

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