Referenced in: none

Automatically associated channels: Kv10.1

Title: Chloride current in toad skeletal muscle and its modification by the histidine-modifying reagent diethylpyrocarbonate.

Authors: G C Bertrán, B A Kotsias

Journal, date & volume: Naunyn Schmiedebergs Arch. Pharmacol., 1996 May , 353, 685-8

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/8738302

Abstract
Cl- currents were measured in short fibres in the toad lumbricalis muscle with a two-microelectrode voltage clamp. Membrane Cl- conductance increased markedly when external pH was raised. At pH 7 or higher, the Cl- current fell during a hyperpolarizing voltage pulse and the rate of inactivation was directly proportional to the voltage change. The histidinemodifying reagent diethylpyrocarbonate (DEPC, 1 mM) which carbethoxylates histidil residues in proteins, suppressed the inactivation of Cl- currents at pH 7.5. On the other hand, no apparent changes in the kinetics of the currents at pH 5 were seen. No3- currents, which are independent of the extracellular pH and time, were not affected by DEPC. Our results support the notion that the inactivation of Cl- currents at pH 7.5 represents a membrane permeability change and that DEPC interferes with this process. Protonation of histidine groups associated with Cl- channels may be the controlling reaction for the pH -dependent Cl- response.