Abstract
Streptomyces violaceoruber grown in co-culture with Streptomyces aburaviensis produces an about 17-fold higher volume of droplets on its aerial mycelium than in single-culture. Physical separation of the Streptomyces strains by either a plastic barrier or by a dialysis membrane, which allowed communication only by the exchange of volatile compounds or diffusible compounds in the medium, respectively, still resulted in enhanced droplet formation. The application of molecular sieves to bioassays resulted in the attenuation of the droplet-inducing effect of S. aburaviensis indicating the absorption of the compound. 1H-NMR analysis of molecular-sieve extracts and the selective indophenol-blue reaction revealed that the volatile droplet-inducing compound is ammonia. The external supply of ammonia in biologically relevant concentrations of ≥8 mM enhanced droplet formation in S. violaceoruber in a similar way to S. aburaviensis. Ammonia appears to trigger droplet production in many Streptomyces strains because four out of six Streptomyces strains exposed to ammonia exhibited induced droplet production.
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Acknowledgements
We thank Dr. Anthony Farlow for language editing and helpful comments. We are grateful to Anke Friemel for NMR measurements. We thank the Konstanz Research School Chemical Biology funded by the Deutsche Forschungsgemeinschaft for financial support.
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Schmidt, K., Spiteller, D. Ammonia Released by Streptomyces aburaviensis Induces Droplet Formation in Streptomyces violaceoruber . J Chem Ecol 43, 806–816 (2017). https://doi.org/10.1007/s10886-017-0870-8
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DOI: https://doi.org/10.1007/s10886-017-0870-8