A representation of the structure of the mitochondrial ATP synthase is presented in Figure 2 of this document. Notably, the chloroplast version of the spinach ATP synthase is remarkably similar to the mitochondrial version of the ATP synthase, with one notable exception. In the Fo portion of the chloroplast ATP synthase there are 14 “c” subunits. Discuss this noteworthy structural difference in the ATP synthases relative to the values you calculated in parts D and E of this problem. F)

Figure 2 INTERMEMBRANE SPACE н* н” at ATP ADP MATRIX (a) Subunit composition of the FF, ATP synthase The F, static component consists of the & subunit plus a catalytic ring formed by a hexagon of alternating a and Bsubunits. The a , ring is the site of ATP syntheels and is immoblized by the & subunit, which connects It to the b, pertpheral stalk of F The F, mobile component consiste of the e and youbunlts, which form the central stalk that ls firmly attached to the co ring of For As proton translocation turns the ce ring, the y subunit rotates Inside the a, catalytic ring ot F- The F, static component consists of one a and two b subunits. The a aubunit forms the proton channel and Is Immobliized in the membrane. The b subunits form the peripheral stalk and are attached both to the a subunit and to F. The F, mobile component conslsts of a ring of ten c subunits. Only one c subunit can form an lonlc bond with the a subunit at a time. For each proton translocated, the ring rotates one-tenth of a turn as the adjacent c oubunit in the ring bonds with the a subunit.