pp 793-815

Chemotaxis in Pseudomonads

  • Rebecca E. ParalesAffiliated withSection of Microbiology, University of California
  • , Abel FerrándezAffiliated withDSM Nutritional Products
  • , Caroline S. HarwoodAffiliated withDepartment of Microbiology and Center for Biocatalysis and Bioprocessing, The University of Iowa

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All Pseudomonas species are motile by one or more polar flagella and are highly chemotactic. Chemotaxis and motility have been implicated in virulence in Pseudomonas aeruginosa 21, and are important for plant root associations in Pseudomonas fluorescens 17. The chemotaxis machinery has not been studied in detail in any Pseudomonas species and the range of attractants and environmental conditions to which Pseudomonads can respond behaviorally remains largely unexplored. However, the availability of four Pseudomonas genome sequences has allowed the identification of numerous potential chemotaxis genes. Experiments in P. aeruginosa and Pseudomonas putida indicate that the general chemotaxis machinery present in these organisms is similar to that of the well-studied enteric bacteria Escherichia coli and Salmonella. The vast array of chemotaxis and receptor genes present in the Pseudomonas genomes suggests that chemotaxis may be more complex and sensory transduction may be more versatile in the Pseudomonads than in enteric bacteria. This chapter will focus primarily on the information gleaned from the complete genome sequences of P. aeruginosa PAOl74, P. putida KT244050, Pseudomonas syringae DC3000 (ref. 8a) and the unfinished P. fluorescens PFOl sequences (http://​www.​jgi.​doe.​gov/JGI_microbial/html/index.html), correlating available functional data whenever possible.