Linked Life Data

6288135

Source:http://linkedlifedata.com/resource/pubmed/id/6288135

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pubmed-article:6288135pubmed:abstractTextThe orientation relaxation of 15 DNA restriction fragments (43-4361 base-pairs) is characterized by measurements of linear dichroism using high electric field pulses. The off-field relaxation of fragments of 84 base-pairs or less can be described by single exponentials, which are related to the transverse rotational diffusion of the helix. Fragments of 95 base-pairs or greater exhibit an additional fast component with time constants around 100 ns for fragments of approx. 100 base-pairs, increasing with chain length to about 700 ns for a fragment with 258 base-pairs. The amplitude of this process increases from virtually zero at low fields (approximately equal to 10 kV) to a substantial limit contribution at high fields. According to these results, we suggest that electric fields induce stretching of the DNA fragments from a weakly bent to a more straight form and that the fast component reflects the internal mobility of the DNA chain. The slow off-field components of the orientation are discussed in terms of different models. The data up to helix lengths of about 400 base-pairs can be described by the 'weakly bending rod' model from Hearst using 3.4 A rise per base-pair and 13 A axial radius of the helix. Both the weakly bending rod according to Hearst and the 'wormlike chain' according to Hagerman and Zimm provide a persistence length of 500 A. The on-field relaxation is slower than the corresponding off-field process at low field strengths, but the on-field process is accelerated substantially at high electric fields. These observations are compared with model calculations of Schwarz.lld:pubmed
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pubmed-article:6288135pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:6288135pubmed:articleTitleOrientation relaxation of DNA restriction fragments and the internal mobility of the double helix.lld:pubmed
pubmed-article:6288135pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:6288135pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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