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. Author manuscript; available in PMC: 2015 Apr 9.
Published in final edited form as: Chem Rev. 2014 Mar 3;114(7):3659–3853. doi: 10.1021/cr400327t

Figure 185.

Figure 185

Structure of (left) ubiquinol oxidase from E. coli and (right) cytochrome c oxidase from P. denitrificans parallel to the membrane. Subunits I,II, III and IV are shown in yellow/green, green, blue and pink, respectively. Hemes b and o3 in subunit I are red and light blue, respectively. The blue spheres in subunits I and II are the CuB and CuA (two Cu atoms) centers, respectively. The dotted circle represents the location of the electron donating substrates—ubiquinol at the posterior of ubiquinol oxidase within the membrane and cytochrome c on the P-side of CcO. (Reprinted with permission from Macmillan Publishers Ltd: Nature Structural Biology Ref. 991, copyright 2000)