title: Biphasic excitation by leucine in Escherichia coli chemotaxis.
abstract: 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 micro M but were repulsed when it was over 0.5 mM. Their responses to concentration jumps confirmed earlier deductions regarding biphasic excitation.
authors.affiliation: Molecular Biology Consortium, Chicago, Illinois 60612, USA. kh01@tigger.uic.edu
authors.forename: Shahid
authors.initials: S
authors.lastname: Khan
authors.forename: David R
authors.initials: DR
authors.lastname: Trentham
mesh_terms: D002633:Chemotaxis; D004926:Escherichia coli / Q000502:physiology*; D007930:Leucine / Q000494:pharmacology*
chemical_list: D007930:Leucine