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Biophys J. 2006 Sep 15;91(6):L72-4. Epub 2006 Jul 14.

Dynamics of K+ ion conduction through Kv1.2.

Author information

1
Beckman Institute, Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

Abstract

The crystallographic structure of a potassium channel, Kv1.2, in an open state makes it feasible to simulate entire K(+) ion permeation events driven by a voltage bias and, thereby, elucidate the mechanism underlying ion conduction and selectivity of this type of channel. This Letter demonstrates that molecular dynamics simulations can provide movies of the overall conduction of K(+) ions through Kv1.2. As suggested earlier, the conduction is concerted in the selectivity filter, involving 2-3 ions residing mainly at sites identified previously by crystallography and modeling. The simulations reveal, however, the jumps of ions between these sites and identify the sequence of multi-ion configurations involved in permeation.

PMID:
16844753
PMCID:
PMC1557577
DOI:
10.1529/biophysj.106.091926
[Indexed for MEDLINE]
Free PMC Article

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