Fig 5.

Influx of potassium ions into energized RLM in response to added paenilides, cereulides, or valinomycin. Mitochondria (1 mg protein ml⁻¹) were incubated in glutamate-malate medium (pH 7.3) containing 116 mM NaCl, 4 mM KCl, and 2 mM NaH₂PO₄. The [K⁺] concentration was determined with a K⁺-selective electrode. Paenilides were added at concentrations of 6.5 and 10 ng ml⁻¹. Cereulides and valinomycin (“valin”) were added to 6.5 ng ml⁻¹. The traces shown are representative of three identical experiments using different mitochondrial preparations.