title: Inhibition of K99 antigen synthesis by L-alanine enterotoxigenic Escherichia coli.
abstract: The effect of various culture media on K99 antigen production by enterotoxigenic Escherichia coli strains of bovine origin was investigated by slide agglutination tests, enzyme-linked immunosorbent assays and in vitro attachment to intestinal villi. A-Alanine at concentrations higher than 0.7 g 1(-1) was responsible for the inhibition of K99 synthesis observed on media rich in amino acids. The increased inhibitory activity of L-alanine in glucose-rich media after autoclaving suggested the formation of inhibitory products via Maillard's reaction. Of various L-alanine derivatives tested, only those that hydrolysed to L-alanine were inhibitory. L-Alanine analogues were without effect and the addition of 10 mM-cyclic AMP did not overcome the repression of K99 biosynthesis by L-alanine. Enzymes involved in cell wall synthesis such as L-alanine racemase or D-alanyl-D-alanine synthetase were evidently were evidently unaffected by L-alanine.
mesh_terms: D000409:Alanine / Q000494:pharmacology*; D000596:Amino Acids / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D000941:Antigens; D000942:Antigens, Bacterial; D000954:Antigens, Surface; D004768:Enterotoxins / Q000096:biosynthesis; D004926:Escherichia coli / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism; D005947:Glucose / Q000494:pharmacology
chemical_list: D000596:Amino Acids; D000900:Anti-Bacterial Agents; D000941:Antigens; D000942:Antigens, Bacterial; D000954:Antigens, Surface; D004768:Enterotoxins; C030659:K antigens; D005947:Glucose; D000409:Alanine