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Fig. 1. Overall structure of E. coli SQR. SdhA, SdhB, SdhC, and SdhD subunits are shown in purple, orange, green, and blue, respectively. FAD is shown in gold and oxaloacetate in green. Heme b and ubiquinone are shown in magenta and yellow. Fe and S atoms of FeS clusters are red and yellow, respectively. Cardiolipin is shown in gray. The SQR monomer is viewed parallel to the membrane. The center-to-center and edge-to-edge (in parentheses) distances between redox centers in E. coli SQR are also shown. [Figure and legend are from (1)]

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