Pseudomonas aeruginosa: a model system for studying the behavior of unbiased flagellar motors.

Pseudomonas aeruginosa's flagellar motor operates with near-unbiased rotation, modulating dwell times rather than bias, revealing a novel chemotaxis mechanism.

• Why it matters: Understanding this unique motor behavior addresses gaps in knowledge about bacterial navigation strategies beyond classical models like Escherichia coli, with implications for microbial motility and adaptation.
• What they did: The study examined the dual-stator architecture (MotAB and MotCD), signaling pathways including c-di-GMP, and auxiliary proteins, analyzing how these components influence motor switching and swimming behaviors.
• The result: Findings show that P. aeruginosa achieves chemotaxis through symmetric modulation of rotational states and a distinctive "wrap" reorientation, advancing insights into molecular motor regulation in complex environments.