Flexibility of A.T pairs in left-handed DNA helices.

Abstract:

:We have analysed by various approaches the structure of cloned synthetic sequences in supercoiled plasmids. Individual inserts were formed by d(C-G)n blocks interrupted by the presence of A.T pairs positioned either in phase or out of phase of pur-pyr alternation. Based on the thermodynamic analysis we obtained results confirming that A.T pairs are easily incorporated into left-handed helices without significant energetic penalty. Sequences GTAC which are known to form cruciform structures in multiple repetition underwent a B-Z transition. In the case of plasmids containing AA/TT code words and substantial discontinuities in purine-pyrimidine alternation our analysis indicates that Z-Z junctions formed by A.T pairs contributed little to the overall energetic demands of the B-Z transition probably thanks to their high conformational flexibility.

journal_name

J Biomol Struct Dyn

authors

Vlach J,Sponar J

doi

10.1080/07391102.1990.10508548

subject

Has Abstract

pub_date

1990-04-01 00:00:00

pages

1083-93

issue

5

eissn

0739-1102

issn

1538-0254

journal_volume

7

pub_type

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