Enzyme-linked immunosorbent assay for detection of type A streptococcal exotoxin: Kinetics and regulation during growth of Streptococcus pyogenes

C. W. Houston, J. J. Ferretti

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We describe the detection and quantitation of type A streptococcal exotoxin (erythrogenic toxin, streptococcal pyrogenic enxotoxin) by an enzyme-linked immunosorbent assay. This sensitive and specific technique detected microgram amounts of type A exotoxin and was useful for studying the kinetics and regulation of type A exotoxin production during the growth of Streptococcus pyogenes NY5. Maximum production of type A exotoxin was observed during the mid-log phase of growth, similar to the production of other streptococcal extracellular products. When S. pyogenes NY5 was grown at 42°C, decreases in both growth and type A exotoxin production were observed. The results obtained when we studied the influence of nutrient additives and metal ions on the production of type A exotoxin led to the conclusion that none of these factors significantly affected type A exotoxin synthesis and that regulation was constitutive.

Original languageEnglish (US)
Pages (from-to)862-869
Number of pages8
JournalInfection and immunity
Volume33
Issue number3
DOIs
StatePublished - 1981

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

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