TY - JOUR
T1 - Transport at the nanoscale
T2 - Temperature dependence of ion conductance
AU - Chimerel, Catalin
AU - Movileanu, Liviu
AU - Pezeshki, Soroosh
AU - Winterhalter, Mathias
AU - Kleinekathöfer, Ulrich
N1 - Funding Information:
Acknowledgments M.W. acknowledge financial support through MRTN-CT-2005-019335 (Translocation) as well as L.M. from Syracuse University start-up funds and the US National Science Foundation Grant DMR-706517. Additionally, we thank Aiping Zhu and Luminita Damian for their help during the preliminary stage of this work.
PY - 2008/11
Y1 - 2008/11
N2 - Temperature dependent ion conductance in nanopores is measured in a wide range of electrolyte concentrations and compared with molecular modeling. Single outer membrane protein F (OmpF) channels from E. coli are reconstituted into planar lipid bilayers. In qualitative agreement with the experimental data, applied-field molecular dynamics unraveled atomistic details of the ion transport. Comparing the temperature dependence of the channel conductance with that of the bulk conductivity in the range from 0 to 90°C revealed that at low salt concentrations the transport is mainly driven along the pore surface. Increasing the salt concentration saturates the surface charge transport and induces ion transport in the center of the nanopore. The confinement of the nanopore then favors the formation of ion pairs. Stepping up the temperature reduces the life time of the ion pairs and increases the channel conductance more than expected from the bulk behavior.
AB - Temperature dependent ion conductance in nanopores is measured in a wide range of electrolyte concentrations and compared with molecular modeling. Single outer membrane protein F (OmpF) channels from E. coli are reconstituted into planar lipid bilayers. In qualitative agreement with the experimental data, applied-field molecular dynamics unraveled atomistic details of the ion transport. Comparing the temperature dependence of the channel conductance with that of the bulk conductivity in the range from 0 to 90°C revealed that at low salt concentrations the transport is mainly driven along the pore surface. Increasing the salt concentration saturates the surface charge transport and induces ion transport in the center of the nanopore. The confinement of the nanopore then favors the formation of ion pairs. Stepping up the temperature reduces the life time of the ion pairs and increases the channel conductance more than expected from the bulk behavior.
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U2 - 10.1007/s00249-008-0366-0
DO - 10.1007/s00249-008-0366-0
M3 - Article
C2 - 18726094
AN - SCOPUS:55349144468
SN - 0175-7571
VL - 38
SP - 121
EP - 125
JO - European Biophysics Journal
JF - European Biophysics Journal
IS - 1
ER -