Ectoine accumulation in Brevibacterium epidermis |
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Authors: | Annelies Onraedt Cassandra De Muynck Bart Walcarius Wim Soetaert Erick Vandamme |
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Affiliation: | (1) The School of Sciences, University of Sunderland, Sunderland, SR1 3SD, UK |
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Abstract: | As a halotolerant bacterial species, Brevibacterium epidermis DSM 20659 can grow at relatively high salinity, tolerating up to 2 m NaCl. It synthesizes ectoine and the intracellular content increases with the medium salinity, with a maximum of 0.14 g ectoine/g CDW at 1 m NaCl. Sugar-stressed cells do not synthesize ectoine. Ectoine synthesis is also affected by the presence of external osmolytes. Added betaine is taken up and completely replaced ectoine, while l-proline is only temporarily accumulated after which ectoine is synthesized. The strain can metabolize ectoine; l-glutamate is a better carbon source for ectoine synthesis than l-aspartate. |
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