{"id":50291,"date":"2023-08-02T09:13:08","date_gmt":"2023-08-02T09:13:08","guid":{"rendered":"https:\/\/matis.is\/?p=50291"},"modified":"2023-08-02T09:13:09","modified_gmt":"2023-08-02T09:13:09","slug":"medium-development-and-production-of-carotenoids-and-exopolysaccharides-by-the-extremophile-rhodothermus-marinus-dsm16675-in-glucose-based-defined-media","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/greinar\/medium-development-and-production-of-carotenoids-and-exopolysaccharides-by-the-extremophile-rhodothermus-marinus-dsm16675-in-glucose-based-defined-media\/","title":{"rendered":"Medium development and production of carotenoids and exopolysaccharides by the extremophile Rhodothermus marinus DSM16675 in glucose-based defined media \u00a0"},"content":{"rendered":"<h3 class=\"wp-block-heading\">Background<\/h3>\n\n\n\n<p>The marine thermophilic bacterium&nbsp;<em>Rhodothermus marinus<\/em>&nbsp;can degrade many polysaccharides which makes it interesting as a future cell factory. Progress using this bacterium has, however, been hampered by limited knowledge on media and conditions for biomass production, often resulting in low cell yields and low productivity, highlighting the need to develop conditions that allow studies of the microbe on a molecular level. This study presents development of defined conditions that support growth, combined with evaluation of production of carotenoids and exopolysaccharides (EPSs) by&nbsp;<em>R. marinus<\/em>&nbsp;strain DSM 16675.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Results<\/h3>\n\n\n\n<p>Two defined media were initially prepared: one including a low addition of yeast extract (modified Wolfe&#039;s medium) and one based on specific components (defined medium base, DMB) to which two amino acids (N and Q), were added. Cultivation trials of&nbsp;<em>R. marinus<\/em>&nbsp;DSM 16675 in shake flasks, resulted in maximum cell densities (OD<sub>620 nm<\/sub>) of 2.36 \u00b1 0.057, cell dry weight (CDW) 1.2 \u00b1 0.14 mg\/L, total carotenoids 0.59 \u00d7 10<sup>-3<\/sup>&nbsp;mg\/L, and EPSs 1.72 \u00b1 0.03 mg\/L using 2 g\/L glucose in DMB. In Wolfe&#039;s medium (supplemented by 0.05 g\/L yeast extract and 2.5 g\/L glucose), maximum OD<sub>620 nm<\/sub>&nbsp;was 2.07 \u00b1 0.05, CDW 1.05 \u00b1 0.07 mg\/L, total carotenoids 0.39 \u00d7 10<sup>-3<\/sup>&nbsp;mg\/L, and EPSs 1.74 \u00b1 0.2 mg\/L. Growth trials at 5 g\/L glucose in these media either failed or resulted in incomplete substrate utilization. To improve reproducibility and increase substrate utilization, a screening of macroelements (eg phosphate) in DMB, was combined with the use of trace elements and vitamins of the modified Wolfe&#039;s medium. The resulting defined minimal&nbsp;<em>R. marinus<\/em>&nbsp;medium, (DRM), allowed reproducible cultivations to a final OD<sub>620 nm<\/sub>&nbsp;of 6.6 \u00b1 0.05, CDW 2.85 \u00b1 0.07 mg\/L, a maximum specific growth rate (\u00b5<sub>max<\/sub>) over 0.26 h<sup>\u22121<\/sup>, total carotenoids 0.77 \u00d7 10<sup>-3<\/sup>&nbsp;mg\/L and EPSs 3.4 \u00b1 0.17 mg\/L in cultivations supplemented with up to 5 g\/L glucose.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p>A minimal defined medium (DRM) was designed that resulted in reproducible growth and an almost doubled formation of both total carotenoids and EPSs. Such defined conditions, are necessary for systematic studies of metabolic pathways, to determine the specific requirements for growth and fully characterize metabolite production.<\/p>","protected":false},"excerpt":{"rendered":"<p>Background The marine thermophilic bacterium&nbsp;Rhodothermus marinus&nbsp;can degrade many polysaccharides which makes it interesting as a future cell factory. Progress using [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"template-greinar.php","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[2011],"tags":[],"class_list":["post-50291","post","type-post","status-publish","format-standard","hentry","category-greinar"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Medium development and production of carotenoids and exopolysaccharides by the extremophile\u00a0Rhodothermus marinus\u00a0DSM16675 in glucose-based defined media \u00a0 - Mat\u00eds<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/matis.is\/en\/greinar\/medium-development-and-production-of-carotenoids-and-exopolysaccharides-by-the-extremophile-rhodothermus-marinus-dsm16675-in-glucose-based-defined-media\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Medium development and production of carotenoids and exopolysaccharides by the extremophile\u00a0Rhodothermus marinus\u00a0DSM16675 in glucose-based defined media \u00a0 - Mat\u00eds\" \/>\n<meta property=\"og:description\" content=\"Background The marine thermophilic bacterium&nbsp;Rhodothermus marinus&nbsp;can degrade many polysaccharides which makes it interesting as a future cell factory. 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