Yang, Hee Wook Song, Ji Young Cho, Sung Mi Kwon, Hak Cheol Pan, Cheol-Ho Park, Youn-Il 2024-01-19T18:30:29Z 2024-01-19T18:30:29Z 2021-08-31 2020-01-20 2045-2322 https://pubs.kist.re.kr/handle/201004/119081 Like other halophilic cyanobacterial genomes, the de novo-assembled genome of Euhalothece sp. Z-M001 lacks genes encoding keto-carotenoid biosynthesis enzymes, despite the presence of genes encoding carotenoid-binding proteins (CBPs). Consistent with this, HPLC analysis of carotenoids identified beta-carotene and zeaxanthin as the dominant carotenoids. CBPs coexpressed with the zeaxanthin biosynthesis gene increased the survival rates of Escherichia coli strains by preventing antibiotic-induced accumulation of reactive oxygen species (ROS). RNA-seq analysis of Euhalothece revealed that among various salt resistance-related genes, those encoding the Na+ transporting multiple resistance and pH adaptation (Mrp) systems, glycine betaine biosynthesis enzymes, exopolysaccharide metabolic enzymes, and CBPs were highly upregulated, suggesting their importance in hypersaline habitats. During the early phase of salt deprivation, the amounts of beta-carotene and zeaxanthin showed a negative correlation with ROS content. Overall, we propose that in some halophilic cyanobacteria, beta-carotene and zeaxanthin, rather than keto-carotenoids, serve as the major chromophores for CBPs, which in turn act as effective antioxidants. English NATURE PUBLISHING GROUP ORANGE CAROTENOID PROTEIN SYNECHOCYSTIS SP PCC-6803 BETA-CAROTENE FUNCTIONAL-ANALYSIS TERMINAL DOMAIN EPS PRODUCTION BIOSYNTHESIS HALOTOLERANT HYDROXYLASE MECHANISM Genomic Survey of Salt Acclimation-Related Genes in the Halophilic Cyanobacterium Euhalothece sp. Z-M001 Article 10.1038/s41598-020-57546-1 1 SCIENTIFIC REPORTS, v.10, no.1 SCIENTIFIC REPORTS 10 1 scie scopus 000511477400001 2-s2.0-85078305206 Multidisciplinary Sciences Science & Technology - Other Topics Article ORANGE CAROTENOID PROTEIN SYNECHOCYSTIS SP PCC-6803 BETA-CAROTENE FUNCTIONAL-ANALYSIS TERMINAL DOMAIN EPS PRODUCTION BIOSYNTHESIS HALOTOLERANT HYDROXYLASE MECHANISM Euhalothece sp. Halophilic Cyanobacterium salt resistance-related genes