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Yoo, Yeonjae; Young Kwon, Dae; Jeon, Minseo; Lee, Jaehoon; Kwon, Haeun; Lee, Dongho; Seong Khim, Jong; Choi, Yoon-E; Kim, Jae-Jin
Bioresource technology, February 2024, 2024-Feb, 2024-02-00, 20240201, Volume: 394Journal Article
Display omitted •Halophilic bacteria accumulate osmolytes in the cytoplasms to adapt to osmotic pressure.•The osmolytes accumulated by Halomonas sp. YJPS3-3 are P3HB.•Developed gamma-irradiated Halomonas mutants boost PHA by 11%.•Creating halotolerance enhanced mutations in halophiles is a pioneering approach. Polyhydroxyalkanoates (PHA) have emerged as a promising bio-compound in the industrial application due to their potential to replace conventional petroleum-based plastics with sustainable bioplastics. This study focuses on Halomonas sp. YJPS3-3, a halophilic bacterium, and presents a novel approach to enhance PHA production by exploiting its salt tolerance toward PHA biosynthesis. Through gamma irradiation-induced mutants with enhanced salt tolerance from 15% NaCl to 20% NaCl, mutant halo6 showing a significant 11% increase in PHA yield, was achieved. Moreover, the mutants displayed not only higher PHA content but also remarkable cell morphology with elongation. In addition, this research unravels the genetic determinants behind the elevated PHA content and identifies a corresponding shift in fatty acid composition favoring PHA accumulation. This novel mutant obtained from gamma irradiation with enhanced salt tolerance in halophilic bacteria opens up new avenues not only for the bioplastic industry but also for applications in the production of high-value metabolites.
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