Can pulling cause right- to left-handed structural transitions in negatively supercoiled DNA double-helix?

Details Can pulling cause right- to left-handed structural transitions in negatively supercoiled DNA double-helix? Can pulling cause right- to left-handed structural transitions in negatively supercoiled DNA double-helix?

1999-08-09

arxiv.org/abs/cond-mat/9908129v2

Mod. Phys. Lett. B13, 999-1003 (1999).

Physics

Condensed Matter

Soft Condensed Matter

3 pages. A new paragraph as well as two figures are added in the revised paper. A new reference (Ref. 7) is included

Scientific paper

The folding angle distribution of stretched and negatively supercoiled DNA double-helix is investigated based on a theoretical model we proposed earlier [H. Zhou et al., Phys. Rev. Lett. 82, 4560 (1999)]. It is shown that pulling can transit a negatively supercoiled DNA double-helix from the right-handed B-form to a left-handed configuration which resembles DNA Z-form in some important respects. The energetics of this possible transition is calculated and the comparison with recent experimental observations are qualitatively discussed.

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