Release of repetitive transient potentials and opening of potassium channels by barium in Eremosphaera viridis

FEBS Letters

Steigner, Wieland¹  Köhler, Kurt¹  Urbach, Wolfgang¹  Simonis, Wilhelm¹  Thaler, Manfred¹ 

[1] Botanisches Institut I, Universität Würzburg, Mittlerer Dallenbergweg 64, D-8700 Würzburg, FRG

关键词: Ba2+ effect;    Ca2+ channel;    K+ channel;    Repetitive transient potential;    (Eremosphaera viridis);    E K;    Nernst potential of potassium;    E m;    membrane potential;    TEA;    tetraethylammonium;    TP;    transient potential;   

DOI  :  10.1016/0014-5793(87)80251-X

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

A concentration-dependent effect of Ba²⁺ on voltage-independent opening of K⁺ channels in Eremosphaera was examined. Low concentrations of external Ba²⁺ (10⁻²mM) cause the release of repetitive transient potentials. Higher concentrations of Ba²⁺, however, inhibit these Ba²⁺-induced repetitive and also light-off triggered transient potentials. Experiments with different Ca²⁺ concentrations in the medium and the treatment with La³⁺ suggest the interaction of Ba²⁺ with Ca²⁺ channels and the participation of internal Ca²⁺ in the activation of K⁺ channels.

【 授权许可】

Unknown