High cell density production of <Emphasis Type="Italic">Deinococcus radiodurans</Emphasis> under optimized conditions |
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Authors: | Yi He |
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Institution: | (1) Laboratory of Biochemistry, National Heart, Lung, and Blood Institute, Bethesda, MD 20892, USA |
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Abstract: | Deinococcus radiodurans is a bacterium being investigated for mechanisms of extreme radiation resistance and for bioremediation of environmental
radioactive waste sites. In both fundamental and applied research settings, methods for large-scale production of D. radiodurans are needed. In this study, a systematic investigation was carried out to optimize D. radiodurans production at the 20-L fermentor scale. In defined medium, the phosphate buffer typically used was found to be inhibitory
to D. radiodurans growth, and caused cell aggregation. Substitution of HEPES and MOPS buffers for phosphate buffer improved D. radiodurans growth characteristics. Several antifoaming agents were investigated to support large-scale production with submerged aeration,
and the defoamer KFO 673 was chosen based on its ability to prevent foaming without affecting D. radiodurans growth. The conventional undefined rich medium tryptone/glucose/yeast extract (TGY) maximally supported D. radiodurans growth to an OD600 of 10. Using a ‘design of experiments’ approach, we found glucose, Mg and Mn to be critical in supporting high-density growth
of D. radiodurans. The optimal pH and temperature for D. radiodurans growth in large-scale preparations were 7.0 and 37°C, respectively. Growth was carried out in a 20-L fermentor using the
newly developed media under the optimal conditions. With addition of 10 g/L glucose, 0.5 g/L MgSO4 · 7H2O, 5 μM MnCl2 into TGY media, an OD600 of 40 was achieved. |
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Keywords: | Deinococcus radiodurans Growth media Growth conditions Design of experiment Fermentor |
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