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• W2026286582 endingPage "2978" @default.
• W2026286582 startingPage "2974" @default.
• W2026286582 abstract "Synexin, a cytosolic protein that mediates Ca2+-dependent membrane fusion, was incorporated into acidic phospholipid bilayers, formed at the tip of a patch pipet. The pipet was filled with a high-Ca2+ solution (50 mM) and immersed in a chamber containing a low-Ca2+ solution (1 mM). Brief exposures of the bilayer to synexin increased the capacitance of the bilayer by a factor of 10 and decreased the membrane resistance by a factor of 20. Reduction of Ca2+ in the chamber to 1 microM caused an abrupt increase in the current required to hold the pipet potential at 0 mV. Under certain conditions channel events could be detected, often occurring in bursts. Consistently, open-time histograms were found to be voltage-dependent and to exhibit one time constant in the time range examined here. The slope conductance for the synexin channel was estimated as 10.2 +/- 2.1 pS for the large Ca2+ gradient with low chamber Ca2+. However, for symmetrical, low-Cl- solutions containing 25 mM Ca2+ the conductance was 26.5 +/- 5.2 pS. Ion-replacement studies showed the synexin channel to much prefer Ca2+ over Ba2+ or Mg2+. Cd2+, a potent blocker of other voltage-gated Ca2+ channels at 100 microM, blocked synexin channels only at very high concentrations (greater than or equal to 10 mM). Similarly, nifedipine, an inhibitor of the nonactivating Ca2+ channel, was effective only at extremely high concentrations (greater than 300 microM). The high selectivity for Ca2+ and the lack of response of the channel to various drugs known to block Ca2+ channels thus distinguish the synexin channel from other types of Ca2+ channels hitherto reported." @default.
• W2026286582 created "2016-06-24" @default.
• W2026286582 creator A5003537359 @default.
• W2026286582 creator A5068923042 @default.
• W2026286582 date "1988-05-01" @default.
• W2026286582 modified "2023-10-16" @default.
• W2026286582 title "Ca2+-activated synexin forms highly selective, voltage-gated Ca2+ channels in phosphatidylserine bilayer membranes." @default.
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• W2026286582 doi "https://doi.org/10.1073/pnas.85.9.2974" @default.
• W2026286582 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/280125" @default.
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