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. 1990 Jan;172(1):334–341. doi: 10.1128/jb.172.1.334-341.1990

Chemotactic control of the two flagellar systems of Vibrio parahaemolyticus.

N Sar 1, L McCarter 1, M Simon 1, M Silverman 1
PMCID: PMC208437  PMID: 2294089

Abstract

Vibrio parahaemolyticus synthesizes two distinct flagellar organelles, the polar flagellum (Fla), which propels the bacterium in a liquid environment (swimming), and the lateral flagella (Laf), which are responsible for movement over surfaces (swarming). Chemotactic control of each of these flagellar systems was evaluated separately by analyzing the behavioral responses of strains defective in either motility system, i.e., Fla+ Laf- (swimming only) or Fla- Laf+ (swarming only) mutants. Capillary assays, modified by using viscous solutions to measure swarming motility, were used to quantitate chemotaxis by the Fla+ Laf- or Fla- Laf+ mutants. The behavior of the mutants was very similar with respect to the attractant compounds and the concentrations which elicited responses. The effect of chemotaxis gene defects on the operation of the two flagellar systems was also examined. A locus previously shown to encode functions required for chemotactic control of the polar flagellum was cloned and mutated by transposon Tn5 insertion in Escherichia coli, and the defects in this locus, che-4 and che-5, were then transferred to the Fla+ Laf- or Fla- Laf+ strains of V. parahaemolyticus. Introduction of the che mutations into these strains prevented chemotaxis into capillary tubes and greatly diminished movement of bacteria over the surface of agar media or through semisolid media. We conclude that the two flagellar organelles, which consist of independent motor-propeller structures, are directed by a common chemosensory control system.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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