A flagellar accessory protein links chemotaxis to surface sensing

Bacteria find suitable locations for colonization by sensing and responding to surfaces. Complex signaling repertoires control surface colonization, and surface contact sensing by the flagellum plays a central role in activating colonization programs. Caulobacter crescentus adheres to surfaces using a polysaccharide adhesin called the holdfast. In C. crescentus , disruption of the flagellum through interactions with a surface or mutation of flagellar genes increases holdfast production. Our group previously identified several C. crescentus genes involved in flagellar surface sensing. One of these, called fssF , codes for a protein with homology to the flagellar C-ring protein FliN. We show here that a fluorescently tagged FssF protein localizes to the flagellated pole of the cell and requires all components of the flagellar C-ring for proper localization, supporting the model that FssF associates with the C-ring. Deleting fssF results in a severe motility defect that we show is due to a disruption of chemotaxis. Epistasis experiments demonstrate that fssF promotes adhesion through a stator-dependent pathway when late-stage flagellar mutants are disrupted. Separately, we find that disruption of chemotaxis through deletion of fssF or other chemotaxis genes results in a hyperadhesion phenotype. Key genes in the surface sensing network ( pleD , motB , and dgcB ) contribute to both Δ flgH- dependent and Δ fssF- dependent hyperadhesion, but these genes affect adhesion differently in the two hyperadhesive backgrounds. Our results support a model in which the stator subunits of the flagella incorporate both mechanical and chemical signals to regulate adhesion. Importance Biofilms pose a threat in clinical and industrial settings. Surface sensing is an early step in biofilm formation. Studying surface sensing can help develop strategies for combating harmful biofilms. Here, we use the freshwater bacterium Caulobacter crescentus to study surface sensing. We characterize a previously unstudied gene, fssF , and find that it localizes to the cell pole in the presence of three proteins that make up a component of the flagellum called the C-ring. Additionally, we find that fssF is required for chemotaxis but dispensable for swimming motility. Lastly, our results show that mutating fssF and other genes required for chemotaxis causes a hyperadhesive phenotype. We propose that surface sensing requires chemotaxis for a robust response to a surface.