(A) Polarographic measurement of KCN-sensitive oxygen consumption, driven by NADH in isolated coupled mitochondria. Mitochondria were isolated from cells expressing the wild type form of Cor1 (Cor1WT) or the mutant Cor1N63A, N187A, D192A, V189A, Y65A, L238A, K240A (Cor1**). Thereby, strains either overexpressed cytochrome c (Cyt cOE) or harbored the empty plasmid as a control (Empty). Measurement was performed in the absence (basal respiration) or presence (phosphorylating condition) of ADP. 