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Biphasic Excitation by Leucine in Escherichia coli Chemotaxis

Molecular Biology Consortium, Chicago, Illinois 60612,¹ National Institute for Medical Research, London NW7 1AA, United Kingdom²

Received 29 July 2003/ Accepted 10 October 2003

Leucine concentration jumps (applied by photolysis of inert derivatives) triggered swim or tumble responses in Escherichia coli mutants lacking Tsr or Tar, respectively. Wild-type E. coli bacteria were attracted in spatial assays when the initial leucine concentration difference was 5 to 120 µM but were repulsed when it was over 0.5 mM. Their responses to concentration jumps confirmed earlier deductions regarding biphasic excitation.

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