Journal of Microbiology and Biotechnology

  • 제34권3호
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  • Pages.710-724
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  • 2024
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  • 1017-7825(pISSN)
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  • 1738-8872(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
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Overproduction of Xanthophyll Pigment in Flavobacterium sp. JSWR-1 under Optimized Culture Conditions

  • Jegadeesh Raman (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Young-Joon Ko (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Jeong-Seon Kim (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Da-Hye Kim (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Soo-Jin Kim (Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration)
  • 투고 : 2023.10.25
  • 심사 : 2023.11.16
  • 발행 : 2024.03.28
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초록

Flavobacterium can synthesize xanthophyll, particularly the pigment zeaxanthin, which has significant economic value in nutrition and pharmaceuticals. Recently, the use of carotenoid biosynthesis by bacteria and yeast fermentation technology has shown to be very efficient and offers significant advantages in large-scale production, cost-effectiveness, and safety. In the present study, JSWR-1 strain capable of producing xanthophyll pigment was isolated from a freshwater reservoir in Wanju-gun, Republic of Korea. Based on the morphological, physiological, and molecular characteristics, JSWR-1 classified as belonging to the Flavobacterium species. The bacterium is strictly aerobic, Gram-negative, rod-shaped, and psychrophilic. The completed genome sequence of the strain Flavobacterium sp. JSWR-1 is predicted to be a single circular 3,425,829-bp chromosome with a G+C content of 35.2% and 2,941 protein-coding genes. The optimization of carotenoid production was achieved by small-scale cultivation, resulting in zeaxanthin being identified as the predominant carotenoid pigment. The enhancement of zeaxanthin biosynthesis by applying different light-irradiation, variations in pH and temperature, and adding carbon and nitrogen supplies to the growth medium. A significant increase in intracellular zeaxanthin concentrations was also recorded during fed-batch fermentation achieving a maximum of 16.69 ± 0.71 mg/l, corresponding to a product yield of 4.05 ± 0.15 mg zeaxanthin per gram cell dry weight. Batch and fed-batch culture extracts exhibit significant antioxidant activity. The results demonstrated that the JSWR-1 strain can potentially serve as a source for zeaxanthin biosynthesis.

키워드

과제정보

This work was carried out with the support of "Cooperative Research Program for Agriculture Science and Technology Development (Project No. RS-2020-RD009897)" Rural Development Administration, Republic of Korea. The first author is grateful to the Agricultural Microbiology Division, Rural Development Administration, Republic of Korea, for the postdoctoral fellowship.

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