Microscopic implications of S-DNA
2010 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, Vol. 82, no 2Article in journal (Refereed) Published
Recent experiments [J. van Mameren et al., Proc. Natl. Acad. Sci. U.S.A. 106, 18231 (2009)] provide a detailed spatial picture of overstretched DNA, showing that under certain conditions the two strands of the double helix separate at about 65 pN. It was proposed that this observation rules out the existence of an elongated, hybridized form of DNA (S-DNA). Here, we argue that the S-DNA picture is consistent with the observation of unpeeling during overstretching. We demonstrate that assuming the existence of S-DNA does not imply DNA overstretching to consist of the complete or near-complete conversion of the molecule from B to S form. Instead, this assumption implies in general a more complex dynamic coexistence of hybridized and unhybridized forms of DNA. We argue that such coexistence can rationalize several recent experimental observations.
Place, publisher, year, edition, pages
2010. Vol. 82, no 2
IdentifiersURN: urn:nbn:se:kth:diva-79166DOI: 10.1103/PhysRevE.82.021907ISI: 000280757700005OAI: oai:DiVA.org:kth-79166DiVA: diva2:495186
QC 201202092012-02-082012-02-082012-02-09Bibliographically approved