Journal article
A simple model for surface charge on ion channel proteins
Biophysical journal, Vol.66(1), pp.59-70
01/1994
Handle:
https://hdl.handle.net/2376/100855
PMCID: PMC1275663
PMID: 7510530
Abstract
We present a simple two-parameter model for surface charge directly associated with ion channels. A spherically symmetric "charged shell" models a distribution of surface charge arrayed about the channel entrance, with a corresponding set of image charges behind the plane of the membrane. The transition between a regime of buffered conductance and a regime of rapidly falling conductance at very low ionic strength is found to depend on the magnitude of the surface charge as well as the separation between the charge and the channel entrance. This resolves an apparent discrepancy between the experimental findings of Naranjo and Latorre (1993. Biophys. J. 64:1038-1050) and previous theoretical computations. The charged-shell model is used in a comparative study of the toad skeletal muscle conductance data of Naranjo and Latorre, the rat skeletal muscle conductances of Ravindran et al. (1992. Biophys. J. 61:494-508), and a second set of rat muscle conductances presented in this paper.
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Details
- Title
- A simple model for surface charge on ion channel proteins
- Creators
- D Naranjo - Department of Biochemistry, Brandeis University, Waltham, MassachusettsR LatorreD CherbavazP McGillM F Schumaker
- Publication Details
- Biophysical journal, Vol.66(1), pp.59-70
- Academic Unit
- Mathematics and Statistics, Department of
- Publisher
- United States
- Grant note
- T32-GM0796 / NIGMS NIH HHS GM-31768 / NIGMS NIH HHS
- Identifiers
- 99900546655501842
- Language
- English
- Resource Type
- Journal article