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Impact of nitrogen concentration on validamycin A production and related gene transcription in fermentation of Streptomyces hygroscopicus 5008

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Abstract

Validamycin A (VAL-A) is an important and widely used agricultural antibiotic. In this study, statistical screening designs were applied to identify significant medium variables for VAL-A production and to find their optimal levels. The optimized medium caused 70% enhancement of VAL-A production. The difference between optimized medium and original medium suggested that low nitrogen source level might attribute to the enhancement of VAL-A production. The addition of different nitrogen sources to the optimized medium inhibited VAL-A production, which confirmed the importance of nitrogen concentration for VAL-A production. Furthermore, differences in structural gene transcription and enzyme activity between the two media were assayed. The results showed that lower nitrogen level in the optimized medium could regulate VAL-A production in gene transcriptional level. Our previous study indicated that the transcription of VAL-A structural genes could be enhanced at elevated temperature. In this work, the increased fermentation temperature from 37 to 42 °C with the optimized medium enhanced VAL-A production by 39%, which testified to the importance of structural gene transcription in VAL-A production. The information is useful for further VAL-A production enhancement.

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Acknowledgments

We appreciate the financial support from the National 863 High Technology Program (Project # 2006AA10A202) of the MOST and the National Natural Science Foundation of China (NSFC project No. 30821005). JJZ also appreciates the National 985 Project and the University Distinguished Professorship program (SJTU).

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Correspondence to Jian-Jiang Zhong.

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Wei, ZH., Bai, L., Deng, Z. et al. Impact of nitrogen concentration on validamycin A production and related gene transcription in fermentation of Streptomyces hygroscopicus 5008. Bioprocess Biosyst Eng 35, 1201–1208 (2012). https://doi.org/10.1007/s00449-012-0707-3

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  • DOI: https://doi.org/10.1007/s00449-012-0707-3

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