Figure 18-17

Redox Centers:
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X-ray structure of the bovine heart cytochrome c oxidase homodimer. The view is perpendicular to its 2-fold axis and parallel to the membrane with the matrix below. The 13 subunits in each protomer, which collectively have 28 transmembrane helices, are drawn in ribbon form and differently colored according to type with Subunit I pale green, Subunit II pink, and Subunit III pale yellow. The protein's bound heme groups and Cu ions are drawn in space-filling form with C green, N blue, O red, Fe red-brown, and Cu cyan. [Based on an X-ray structure by Shinya Yoshikawa, Himeji Institute of Technology, Hyogo, Japan. PDBid 1V54.]