Fluctuations of the Ca2+-activated K+ current in Aplysia neurones

Hartung, Klaus; Hermann, A.

doi:10.1016/0005-2736(87)90329-4

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Fluctuations of the Ca²⁺-activated K⁺ current in Aplysia neurones

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Hartung, Klaus
Transport Proteins Group, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Hartung, K., & Hermann, A. (1987). Fluctuations of the Ca²⁺-activated K⁺ current in Aplysia neurones. Biochimica et Biophysica Acta-Biomembranes, 897(1), 201-205. doi:10.1016/0005-2736(87)90329-4.

Cite as: https://hdl.handle.net/21.11116/0000-0008-3EFD-7

Abstract

Fluctuations of the Ca²⁺-activated K⁺ current were measured in identified Aplysia neurones under voltage clamp conditions. The amplitude of _IK,Ca was manipulated by ionophoretic injections of Ca²⁺. At small amplitudes of Ca²⁺-activated outward currents the variance of the Ca²⁺-activated current fluctuations increases linearly with the mean outward current. The single-channel conductance estimated from the variance of the fluctuations and the mean outward current is 11 ± 3 pS at -30 mV. Power spectra of the Ca²⁺-activated K⁺ current can be fitted by the sum of two Lorentzian components with corner frequencies of about 10 Hz and 120 Hz.