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Screw motion of DNA...
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Starikov, Evgeni B.Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT),Technische Universität Dresden
(author)
Screw motion of DNA duplex during translocation through pore. I. Introduction of the coarse-grained model
- Article/chapterEnglish2009
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LIBRIS-ID:oai:research.chalmers.se:4374837c-c785-485a-a11d-8a841838f49e
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https://doi.org/10.1142/S1793048009000995DOI
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https://research.chalmers.se/publication/254099URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Based upon the structural properties of DNA duplexes and their counterion-water surrounding in solution, we have introduced here a screw model which may describe translocation of DNA duplexes through artificial nanopores of the proper diameter (where the DNA counterion-hydration shell can be intact) in a qualitatively correct way. This model represents DNA as a kind of "screw," whereas the counterion-hydration shell is a kind of "nut." Mathematical conditions for stable dynamics of the DNA screw model are investigated in detail. When an electrical potential is applied across an artificial membrane with a nanopore, the "screw" and "nut" begin to move with respect to each other, so that their mutual rotation is coupled with their mutual translation. As a result, there are peaks of electrical current connected with the mutual translocation of DNA and its counterion-hydration shell, if DNA is possessed of some non-regular base-pair sequence. The calculated peaks of current strongly resemble those observed in the pertinent experiments. An analogous model could in principle be applied to DNA translocation in natural DNA-protein complexes of biological interest, where the role of "nut" would be played by protein-tailored "channels." In such cases, the DNA screw model is capable of qualitatively explaining chemical-to-mechanical energy conversion in DNA-protein molecular machines via symmetry breaking in DNA-protein friction.
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Hennig, D.Humboldt-Universität zu Berlin,Humboldt University of Berlin
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Yamada, H.
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Gutierrez, R.Technische Universität Dresden
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Nordén, Bengt,1945Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)norden
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Cuniberti, G.Technische Universität Dresden
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Karlsruher Institut für Technologie (KIT)Technische Universität Dresden
(creator_code:org_t)
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In:Biophysical Reviews and Letters4:3, s. 209-2301793-0480
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