Syntrophy of Crypthecodinium cohnii and immobilized Zymomonas mobilis for docosahexaenoic acid production from sucrose-containing substrates.

Autor: Strazdina I; University of Latvia, Institute of Microbiology and Biotechnology, Riga, Latvia., Klavins L; University of Latvia, Natural Resource Research Centre, Riga, Latvia., Galinina N; University of Latvia, Institute of Microbiology and Biotechnology, Riga, Latvia., Shvirksts K; University of Latvia, Institute of Microbiology and Biotechnology, Riga, Latvia., Grube M; University of Latvia, Institute of Microbiology and Biotechnology, Riga, Latvia., Stalidzans E; University of Latvia, Institute of Microbiology and Biotechnology, Riga, Latvia., Kalnenieks U; University of Latvia, Institute of Microbiology and Biotechnology, Riga, Latvia. Electronic address: uldis.kalnenieks@lu.lv.
Jazyk: angličtina
Zdroj: Journal of biotechnology [J Biotechnol] 2021 Sep 10; Vol. 338, pp. 63-70. Date of Electronic Publication: 2021 Jul 16.
DOI: 10.1016/j.jbiotec.2021.07.008
Abstrakt: Marine heterotrophic dinoflagellate Crypthecodinium cohnii is an aerobic oleaginous microorganism that accumulates intracellular lipid with high content of 4,7,10,13,16,19-docosahexaenoic acid (DHA), a polyunsaturated ω-3 (22:6) fatty acid with multiple health benefits. C. cohnii can grow on glucose and ethanol, but not on sucrose or fructose. For conversion of sucrose-containing renewables to C. cohnii DHA, we investigated a syntrophic process, involving immobilized cells of ethanologenic bacterium Zymomonas mobilis for fermenting sucrose to ethanol. The non-respiring, NADH dehydrogenase-deficient Z. mobilis strain Zm6-ndh, with high ethanol yield both under anaerobic and aerobic conditions, was taken as the genetic background for inactivation of levansucrase (sacB). SacB mutation eliminated the levan-forming activity on sucrose. The double mutant Zm6-ndh-sacB cells were immobilized in Ca alginate, and applied for syntrophic conversion of sucrose to DHA of C. cohnii, either taking the ethanol-containing fermentation medium from the immobilized Z. mobilis for feeding to the C. cohnii fed-batch culture, or directly coculturing the immobilized Zm6-ndh-sacB with C. cohnii on sucrose. Both modes of cultivation produced C. cohnii CCMP 316 biomass with DHA content around 2-3 % of cell dry weight, corresponding to previously reported results for this strain on glucose.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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