Journal
BIOPHYSICAL JOURNAL
Volume 94, Issue 9, Pages 3486-3496Publisher
BIOPHYSICAL SOC
DOI: 10.1529/biophysj.107.122796
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Funding
- NIGMS NIH HHS [GM076013, GM067241, R01 GM076013, R01 GM067241] Funding Source: Medline
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Another research group has proposed an interesting model for calcium channel selectivity. However, on the basis of their reported results we find it impossible to assess the merits of their model because their results and claims concerning selectivity are based on an extrapolation over four orders of magnitude to low Ca2+ concentration. Their results and claims have been presented in several articles and reviews in several journals and, thus, need attention. In this article, we first establish that we obtain results on electrostatics and channel occupancies similar to the high-concentration simulations they present. We then perform grand canonical ensemble simulations that enable us to study micromolar Ca2+ concentrations. We find that their model channel is only weakly Ca2+ selective. A crucial problem with their model appears to be the placement of the negatively charged glutamate structural elements in fixed positions inside the protein rather than as flexible units inside the filter.
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