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The smallest molecular weight subunit (subunit IV), which contains no redox prosthetic group,is the only supernumerary subunit in the four-subunit Rhodobacter sphaeroides bc1 complex.This subunit is involved in Q binding and the structural integrity of the complex. When thecytochrome bc1 complex is photoaffinity labeled with [3H]azido-Q derivative, radioactivity isfound in subunits IV and I (cytochrome...