Abstract
An integrated high-throughput screening (HTS) strategy was developed to screen large numbers of polymyxin E-producing mutants of Paenibacillus polymyxa. Various types of mutants were transferred onto the surfaces of solidified agar in 96-well microtiter plates, and then inoculated to 96-deep-well microtiter plates for micro-cultivation. The culture conditions were optimized for the production of polymyxin E. The supernatants from the micro-culture plates were transferred to 96-well bioassay microtiter plates containing Escherichia coli JM109 for high-throughput bioassay. By using this high-throughput screening (HTS) procedure, one best producer P. polymyxa PE 5.808 was identified from a large NTG mutated library with about 5,000 isolates. The volumetric productivity of polymyxin E of P. polymyxa PE 5.808 was 1,200 μg/ml in shake flasks, about 140% improvement compared with that of the wild type strain.
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Acknowledgement
This work was financially supported by the Ministry of Science and Technology of China (National Basic Research Program of China, 2007CB707805; National “863” Research Program of China, 2006AA02Z239).
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Wang, J., Tao, Y., Xu, Z. et al. An integrated high throughput strategy to screen mutants of Paenibacillus polymyxa with high polymyxin E-productivity. World J Microbiol Biotechnol 24, 1885–1891 (2008). https://doi.org/10.1007/s11274-008-9686-6
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DOI: https://doi.org/10.1007/s11274-008-9686-6