Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers

Spassova M, Tsoneva I, Petrov AG, Petkova JI, Neumann E (1994)
Biophysical Chemistry 52(3): 267-274.

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Abstract / Bemerkung
Planar lipid bilayers formed from monolayers of diphytanoyl lecithin (DPhL) were found to interact with plasmid DNA (5.6 kbp; M(r) = 3.7 X 10(6)) leading to an increase in the conductance of the membrane. The association of DNA with a lipid bilayer greatly facilitates the transport of the small ions of the main salt KCl. The appearance of long-lived current levels, for instance, of 27.6 pA at V-m = +60 mV membrane voltage, where the actual contact (adsorption) is electrophoretically enhanced, suggests a locally conductive DNA/lipid interaction zone where parts of the DNA strand may be transiently inserted in the bilayer, leaving other parts of the DNA probably protruding out from the outer surface of the bilayer. At V-m = -60 mV, where DNA can be electrophoretically moved away from the membrane, the membrane current is practically zero. This current asymmetry is initially also observed at higher voltages, for instance at 200 mV. However, if the voltage sign (V-m = +200 mV) is changed after a transient positive current (approximate to 15 pA) was observed, there is also now (at V-m = -200 mV) a finite negative current at the negative membrane voltage. Thus, it appears that at V-m = +200 mV the adsorbed parts of the polyelectrolyte DNA are not only transiently inserted in, but actually also electrophoretically pulled through, the porous zones onto the other membrane side leaving the bilayer structure basically intact. These data provide direct electric evidence for the electrophoretic transport of a highly charged and hydrated macromolecule, probably together with the associated gegen-ions, through the thin hydrophobic film of the lipid bilayer.
Erscheinungsjahr
Zeitschriftentitel
Biophysical Chemistry
Band
52
Zeitschriftennummer
3
Seite
267-274
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Spassova M, Tsoneva I, Petrov AG, Petkova JI, Neumann E. Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers. Biophysical Chemistry. 1994;52(3):267-274.
Spassova, M., Tsoneva, I., Petrov, A. G., Petkova, J. I., & Neumann, E. (1994). Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers. Biophysical Chemistry, 52(3), 267-274. doi:10.1016/0301-4622(94)00097-4
Spassova, M., Tsoneva, I., Petrov, A. G., Petkova, J. I., and Neumann, E. (1994). Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers. Biophysical Chemistry 52, 267-274.
Spassova, M., et al., 1994. Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers. Biophysical Chemistry, 52(3), p 267-274.
M. Spassova, et al., “Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers”, Biophysical Chemistry, vol. 52, 1994, pp. 267-274.
Spassova, M., Tsoneva, I., Petrov, A.G., Petkova, J.I., Neumann, E.: Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers. Biophysical Chemistry. 52, 267-274 (1994).
Spassova, M., Tsoneva, I., Petrov, A. G., Petkova, J. I., and Neumann, Eberhard. “Dip patch clamp currents suggest electrodiffusive transport of the polyelectrolyte DNA through lipid bilayers”. Biophysical Chemistry 52.3 (1994): 267-274.
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