An aerotaxis transducer gene from Pseudomonas putida.

Area of Science:

• Microbiology
• Bacterial Physiology
• Chemotaxis

Background:

• Pseudomonas putida exhibits aerotaxis, the ability to move towards an air-liquid interface.
• The genetic basis for this aerotactic behavior in P. putida was not fully understood.

Purpose of the Study:

• To clone and characterize the aerotaxis gene (aer) from Pseudomonas putida PRS2000.
• To investigate the role of the cloned aer gene in P. putida's aerotactic response.

Main Methods:

• Cloning of the aerotaxis gene from P. putida.
• Construction and analysis of a P. putida aer mutant.
• Complementation studies using wild-type aer gene.

Main Results:

• A P. putida aer mutant displayed a significantly altered aerotactic response, failing to cluster at the air-liquid interface.
• Wild-type P. putida clustered at the air-liquid interface, while the mutant formed a diffuse band.
• Complementation with wild-type aer restored and even enhanced the aerotactic response in the mutant.

Conclusions:

• The cloned aer gene is essential for aerotaxis in Pseudomonas putida.
• The P. putida Aer protein shares significant sequence similarity with the energy taxis (aerotaxis) signal transducer protein in Escherichia coli.
• The findings elucidate the molecular mechanism underlying aerotaxis in P. putida.