Ammonium effects on streptonigrin biosynthesis by Streptomyces flocculus

Kimberlee K. Wallace, Gregory F. Payne, Marilyn K. Speedie

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A defined medium containing glucose and ammonium as the sole carbon and nitrogen sources was developed to support growth and streptonigrin production. In this defined medium, increased initial levels of ammonium resulted in increased growth suggesting that nitrogen is the growth limiting nutrient. In some cases, increased initial ammonium levels resulted in decreased specific streptonigrin productivity, suggesting that nitrogen regulatory mechanisms may adversely affect streptonigrin biosynthesis. This suggestion that nitrogen regulation adversely affects antibiotic biosynthesis is further supported by results from two studies in which the ammonium supply to the cells was controlled. In the first study, streptonigrin productivity and final titer were enhanced by the addition of an ammonium trapping agent. In the second experiment, when ammonium chloride was fed slowly throughout the course of cultivation, the production phase was lengthened and the maximum antibiotic concentration was enhanced compared to the batch controls containing either the same initial or the same total ammonium chloride levels. Although our results indicate streptonigrin production may be subject to nitrogen regulatory mechanisms, the effect of nitrogen on streptonigrin production cannot be strictly correlated to the extracellular ammonium concentration. In fact, we observed that when ammonium was depleted from the medium, streptonigrin production ceased.

Original languageEnglish (US)
Pages (from-to)43-48
Number of pages6
JournalJournal of Industrial Microbiology
Volume6
Issue number1
DOIs
StatePublished - Sep 1 1990

Keywords

  • Nitrogen regulation
  • Secondary metabolite
  • Shikimic acid pathway
  • Streptomyces
  • Streptonigrin

Fingerprint Dive into the research topics of 'Ammonium effects on streptonigrin biosynthesis by Streptomyces flocculus'. Together they form a unique fingerprint.

Cite this