Earth History Research Center

Figure3. The molecular structure of the F1 subunit of the ATP Synthase complex found in the bacterial outer membrane. The F1 complex has five parts, here labeled a, b, g, d and e. Three each of a and b subunits are associated in a hexamer with each a unit alternating with a b unit. The hexamer surrounds a single g unit that has a complex coiled region for insertion into the c ring (rotor) of the F0 complex. (see figure 4). The d subunit of the F1 contacts the b protein of the F0 complex, acting as a stator.  The function of the e subunit is not well understood, but it may serve to anchor the g protein to the "c" subunit of the F0 complex.