(A) Blue-native gel electrophoresis and immunoblots of cells expressing the wild type form of Cor1 (Cor1WT), as well as the mutants Cor1N63A, N187A, D192A (Cor1*) and Cor1N63A, N187A, D192A, V189A, Y65A, L238A, K240A (Cor1**) in wild type (WT) background as well as in cells lacking CRD1 (crd1Δ). Blots were probed with antibodies against Cor1 to visualize Complex III (CIII), as well as Cox1, to monitor Complex IV (CIV). CV: Complex V; Cor1Cor2: multimer consisting of Cor1 and Cor2 