FIGURE 4.

Ag⁺-sensitive NADH oxidation by membranes containing subcomplexes of Na⁺-NQR. The specific NADH oxidation activity of washed membrane vesicles from V. cholerae Δnqr transformants expressing different sets of Nqr subunits were determined in the absence of Ag⁺ (black bars) and in the presence of 1 μm AgNO₃ (gray bars). Ubiquinone-1 was used as electron acceptor. Membranes from V. cholerae Δnqr and from transformants expressing NqrA served as controls. Mean values and standard deviations from at least two measurements are shown.