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J Bacteriol. 1975 December; 124(3): 1142-1147

Chemotaxis of a motile Streptococcus toward sugars and amino acids.

ABSTRACT

A motile Streptococcus was isolated and its chemotactic behavior toward sugars and amino acids was studied. Motility was optimal in the presence of an exogenous energy source and a nonionic detergent, e.g., Tween 80 or Brij-36. Both glucose and pyruvate could serve as energy source. Chemotaxis toward leucine was optimal at pH 7 to 8.5 and a temperature between 30 and 37 C. The Streptococcus showed a chemotactic response toward a variety of sugars. All commonly occurring L-amino acids, except alanine, asparagine, aspartate, glutamate, arginine, and lysine, were attractants. From concentration response curves the thresholds, peak concentrations, and optimal responses were determined.