Abstract
Defined and semi-defined medium-based feeding strategies were developed to enhance recombinant human growth hormone (rhGH) production by Bacillus subtilis BGSC-1A178 (scoC −) strain carrying pMK4::pre(subC)::hGH. Defined medium-based feeding strategies were designed by exponential feeding of glucose and (NH4)2HPO4 at two pre-determined specific growth rates, µ 0 = 0.10 and 0.17 h−1. Semi-defined medium-based feeding strategies were designed by exponential feeding of substrate solution consisting of glucose, (NH4)2HPO4, peptone, and trace salt solution (PTM1) at three pre-determined specific growth rates, µ 0 = 0.10, 0.17, and 0.25 h−1. At all the strategies applied, transition cultivation time from batch to fed-batch operation was t T = 4 h. The highest rhGH concentration was obtained as C rhGH = 0.5 g L−1 with semi-defined medium-based feeding strategy designed with µ 0 = 0.25 h−1 using feed substrate stock solution containing 200 g L−1 glucose, 117 g L−1 (NH4)2HPO4, 100 g L−1 peptone, and 5 mL L−1 PTM1 at t = 22 h when the cell concentration reached to C X = 8.29 g L−1. The overall product and cell yields on glucose were obtained as \(\bar{Y}_{P/S}\) = 7.21 mg g−1 and \(\bar{Y}_{X/S}\) = 0.12 g g−1, respectively. The results indicate the requirement of designing continuous feed stream in fed-batch production to enhance rhGH production by r-B. subtilis.
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Acknowledgments
This work was supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) through the project 109R025 and by Middle East Technical University (METU) research fund. S.Ö. was awarded a PhD scholarship by Scientific and Technical Research Council of Turkey (TÜBİTAK). Bacillus Genetic Stock Center (BGSC) is gratefully acknowledged for providing Bacillus subtilis BGSC-1A178 (scoC −) strain.
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The authors declare that they have no conflict of interest.
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B. Şahin and S. Öztürk contributed equally to this work.
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Şahin, B., Öztürk, S., Çalık, P. et al. Feeding strategy design for recombinant human growth hormone production by Bacillus subtilis . Bioprocess Biosyst Eng 38, 1855–1865 (2015). https://doi.org/10.1007/s00449-015-1426-3
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DOI: https://doi.org/10.1007/s00449-015-1426-3