Figure 2

Broader context of bacterial flagellar motor diversity enables inference of ancestral states. Subtomogram averages (as profile and slice through proximal and medial ring structures) of relevant bacterial flagellar motors from this and previous studies. Panels, l–r: 100 × 100 nm slice through the centre of the motor; 100 × 100 nm cross-section through the motor at the stator plane; close-up of periplasmic and inner membrane region highlighted by red box for S. enterica motor; isosurface rendering of close-up of periplasmic and inner membrane region. Isosurface labels in black denote proteins whose locations have been experimentally determined; labels in grey represent protein locations inferred from experimental determinations in related organisms. Motor species, from top to bottom: S. enterica ⁸, V. fischeri ⁸, B. bacteriovorus (this study), A. butzleri (this study), C. jejuni ⁸, W. succinogenes (this study), H. pylori ¹⁷, and H. hepaticus ². “B”, “M”, and “P” labels depict Basal disk, Medial ring, and Proximal rings respectively for the C. jejuni motor.