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| Content Provider | PubMed Central |
|---|---|
| Author | Shenkel, S. Cooper, E. C. James, W. Agnew, W. S. Sigworth, F. J. |
| Abstract | A recent study showed that limited trypsin treatment of liposomes containing purified Electrophorus electricus sodium channels activates a sodium radiotracer flux. We now report that similarly treated sodium channels show voltage-gated, tetrodotoxin-sensitive and highly sodium-selective single-channel currents when incorporated into planar lipid membranes. The trypsinized channels opened repeatedly in bursts of several seconds duration, as would be expected for channels whose fast inactivation process had been removed. Furthermore, they have a higher conductance, different voltage-dependence of gating, and a remarkably higher selectivity (PNa/PK = 41) than sodium channels bound by batrachotoxin or other activating neurotoxins; these properties of the trypsinized channels are probably closer to those of channels in intact electrocytes. |
| Starting Page | 9592 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 86 |
| Language | English |
| Publisher Date | 1989-12-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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