K+ conductance modified by a titratable group accessible to protons from the intracellular side of the squid axon membrane

Biophysical Journal
E WankeP L Testa

Abstract

In the range of pH examined (5.2-10), variations of internal pH from high to low values result in a reversible decrease of the conductance of the open K channels, without significantly affecting the kinetics parameters. A linear plot of the conductance versus internal pH suggests the existence of a titratable group that has an apparent pKa of about 6.9, and that is accessible to protons only from the intracellular side of the membrane.

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Related Concepts

Squid
Protoplasm
Potassium
Electric Conductivity
Ion Channel
Axon
Illex
Potassium Channel
Potassium Ion Transport
Hydrogen-Ion Concentration

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