Figure 2. Pseudomonas FliD forms hexamers in crystals.
(a) Top view, cartoon representation of the FliD78–405 hexamer. Each monomer subunit is colored distinctly and inner diameter dimension is indicated. (b) Side view, cartoon representation of the FliD78–405 hexamer. Each monomer subunit is colored distinctly. Outer dimensions are indicated. (c) FliD78–405 hexamers as arranged in the crystal are stacked head-to-head and leg-to-leg (shown) in an alternating fashion, with residues 303–308 assembling in the Head 1 domain of an opposing molecule (close-up views) leading to a dodecameric crystal packing. (d) Cryo-EM structure of Salmonella FliD from (Maki-Yonekura et al., 2003) for comparison.