In situ structure of a bacterial flagellar motor at subnanometre resolution reveals adaptations for increased torque.

ABSTRACT: The bacterial flagellar motor, which spins a helical propeller for propulsion, has undergone evolutionary diversification across bacterial species, often involving the addition of structures associated with increasing torque for motility in viscous environments. Understanding how such structures function and have evolved is hampered by challenges in visualizing motors in situ. Here we developed a Campylobacter jejuni minicell system for in situ cryogenic electron microscopy imaging and single-particle analysis of its motor, one of the most complex flagellar motors known, to subnanometre resolution. Focusing on the large periplasmic structures which are essential for increasing torque, our structural data, interpreted with molecular models, show that the basal disk comprises concentric ring

SUBMITTER: Drobnic T 

PROVIDER: S-EPMC12222027 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature