title: Kinetics and regulation of erythrogenic toxins type A and C during growth of Streptococcus pyogenes.
abstract: The production of erythrogenic toxins type A (ETA) and C (ETC) is described as a function of growth kinetics. Group A streptococcal strains C 203 S and NY 5 were cultivated in yeast-peptone extract, Todd-Hewitt medium and a synthetic medium. Two main growth phases occurred during growth: a first logarithmic phase and a second linear phase. These phases were separated by a short stationary interphase caused by limitation of the amino acids L-serine and L-leucine. Maximum production of ETC was observed during the logarithmic phase, it was correlated to a high level of viable cells. ETA was produced mainly during the short stationary interphase. The production of ETC is regulated by L-isoleucine. A stagnation or reduction of the concentration of viable cells was observed during the interphase. The phosphate limitation caused during streptococcal growth induced expression of the extracellular protein phosphatase and surprisingly, of a serine proteinase activity. The association between these results and the pathogenicity of streptococci is discussed.
authors.affiliation: Institut fur Experimentelle Mikrobiologie der Friedrich-Schiller-Universitat Jena, Germany.
authors.forename: J H
authors.initials: JH
authors.lastname: Ozegowski
authors.forename: L
authors.initials: L
authors.lastname: Wollweber
authors.forename: S
authors.initials: S
authors.lastname: Vettermann
authors.forename: P J
authors.initials: PJ
authors.lastname: Muller
authors.forename: E
authors.initials: E
authors.lastname: Gunther
authors.forename: W
authors.initials: W
authors.lastname: Kohler
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000596:Amino Acids / Q000378:metabolism; D001426:Bacterial Proteins; D003470:Culture Media; D005098:Exotoxins / Q000096:biosynthesis*; D007700:Kinetics; D008565:Membrane Proteins; D010710:Phosphates / Q000172:deficiency; D013297:Streptococcus pyogenes / Q000254:growth & development* / Q000472:pathogenicity; D013379:Substrate Specificity
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins; D003470:Culture Media; D005098:Exotoxins; D008565:Membrane Proteins; D010710:Phosphates; C117980:SpeA protein, Streptococcus pyogenes; C027951:erythrogenic toxin; D000135:Acid Phosphatase