Figure 3
Superimposed structures of the previously proposed menaquinol-binding cavities of W. succinogenes and D. gigas QFR. (a) A front stereo view (b) a side stereo view of the superimposed structures of the subunits C containing the previously proposed menaquinol-binding cavities from W. succinogenes and the similar region of D. gigas are shown in magenta and blue ribbon, respectively. The bL hemes of D. gigas and W. succinogenes are shown as green and cyan sticks, respectively. The key residues Glu-C66 in W. succinogenes QFR and Glu-C60 in D. gigas QFR with distinct conformations are shown as light magenta and blue sticks, respectively, whereas the other key residues Glu-C180 in W. succinogenes QFR and Glu-C164 in D. gigas QFR with the similar conformations are also shown as light magenta and blue sticks, respectively. The proposed menaquinol-binding cavity in W. succinogenes QFR is presented in a dashed elliptical circle.
