Zn²⁺ inhibits LpH_V1 proton currents and scintillon luminescence.

<p><b>(A)</b> Proton currents at +60 mV at pH_o 7.0 were reduced by Zn²⁺. The mean reduction of current by 100 μM Zn²⁺ was 63 ± 11% (mean ± SEM, <i>n</i> = 4). (B) Luminescence of <i>L</i>. <i>polyedrum</i> scintillons stimulated by 50 mM acetate and measured in a plate reader was inhibited by Zn²⁺. (C) Zn²⁺ sensitivity of luminescence of <i>L</i>. <i>polyedrum</i> scintillons stimulated by 50 mM acetate and measured with a photometer generously provided by J. W. Hastings.