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Killing effect of deinoxanthins on cyanobloom-forming Microcystis aeruginosa: Eco-friendly production and specific activity of deinoxanthins

Authors
Kim, WonjaeKim, MinkyungHong, MinyoungPark, Woojun
Issue Date
9월-2021
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Keywords
Agricultural by-product; Antibacterial compounds; Carotenoid; Deinoxanthin derivative; Pigment; Soybean meal
Citation
ENVIRONMENTAL RESEARCH, v.200
Indexed
SCIE
SCOPUS
Journal Title
ENVIRONMENTAL RESEARCH
Volume
200
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136710
DOI
10.1016/j.envres.2021.111455
ISSN
0013-9351
Abstract
Cyanobacterial blooms caused mainly by Microcystis aeruginosa could be controlled using chemical and biological agents such as H2O2, antagonistic bacteria, and enzymes. Little is known about the possible toxic effects of bacterial membrane pigments on M. aeruginosa cells. Deinococcus metallilatus MA1002 cultured under light increased the production of several carotenoid-like compounds by upregulating two deinoxanthin biosynthesis genes: crtO and cruC. The deinoxanthin compounds were identified using thin-layer chromatography, highperformance liquid chromatography, and liquid chromatography-mass spectrometry. D. metallilatus was cultured with agricultural by-products under light to produce the deinoxanthin compounds. Soybean meal, from six tested agricultural by-products, was selected as the single factor for making an economical medium to produce deinoxanthin compounds. The growth of axenic M. aeruginosa PCC7806, as well as other xenic cyanobacteria such as Cyanobium gracile, Trichormus variabilis, and Dolichospermum circinale, were inhibited by the deinoxanthin compounds. Scanning electron microscopic images showed the complete collapse of M. aeruginosa cells under deinoxanthin treatment, probably due to its interference with cyanobacterial membrane synthesis during cellular elongation. Deinoxanthins appeared to be nontoxic to other non-cyanobacteria such as Acinetobacter, Pseudomonas, Methylobacterium, and Bacillus species, suggesting that it can be a novel candidate for preventing cyanobacterial blooms through its specific activity against cyanobacteria.
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생명과학대학 (환경생태공학부)
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