Abstract
Total of 171 alkaliphilic actinomycetes were evaluated for extracellular RNase production and Streptomyces sp. M49-1 was selected for further experiments. Fermentation optimization for RNase production was implemented in two steps using response surface methodology with central composite design. In the first step, the effect of independent fermentation variables including temperature, initial pH and process time were investigated. After identification of carbon and nitrogen sources affecting the production by one variable at a time method, concentrations of glucose and yeast extract and also inoculum size were chosen for the second central composite design. A maximum RNase activity was obtained under optimal conditions of 4.14 % glucose concentration, 4.63 % yeast extract concentration, 6.7 × 106 spores as inoculum size for 50 ml medium, 42.9 °C, 91.2 h process time and medium initial pH 9.0. Optimum activity of the enzyme is achieved at pH 11 and temperature 60 °C. The enzyme is highly stable at pH range 9.0–12.0 and at 90 °C after 2 h. Statistical optimization experiments provide 2.25 fold increases in the activity of alkalotolerant and thermostable RNase and shortened the fermentation time compared to that of unoptimized condition. The members of Streptomyces can be promising qualified RNase producer for pharmaceutical industries.
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Acknowledgments
This research was supported by The Research Fund of Ege University with 09.MUH.078 project number. The authors would like to thank Professor Murat Elibol (Department of Bioengineering, Faculty of Engineering, Ege University, Izmir, Turkey) for his valuable comments and suggestions during the preparation of this manuscript.
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Demir, T., Gübe, Ö., Yücel, M. et al. Increased alkalotolerant and thermostable ribonuclease (RNase) production from alkaliphilic Streptomyces sp. M49-1 by optimizing the growth conditions using response surface methodology. World J Microbiol Biotechnol 29, 1625–1633 (2013). https://doi.org/10.1007/s11274-013-1325-1
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DOI: https://doi.org/10.1007/s11274-013-1325-1