{"id":37675,"date":"2021-05-31T15:36:56","date_gmt":"2021-05-31T15:36:56","guid":{"rendered":"https:\/\/matis.is\/?p=37675"},"modified":"2021-05-31T15:36:57","modified_gmt":"2021-05-31T15:36:57","slug":"characterization-of-carotenoids-in-rhodothermus-marinus","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/greinar\/characterization-of-carotenoids-in-rhodothermus-marinus\/","title":{"rendered":"Characterization of carotenoids in Rhodothermus marinus"},"content":{"rendered":"<p><em>Rhodothermus marinus,<\/em>\u00a0a marine aerobic thermophile, was first isolated from an intertidal hot spring in Iceland. In recent years, the\u00a0<em>R. marinus<\/em>\u00a0strain PRI 493 has been genetically modified, which opens up possibilities for targeted metabolic engineering of the species, such as of the carotenoid biosynthetic pathway. In this study, the carotenoids of the\u00a0<em>R. marinus<\/em>\u00a0type-strain DSM 4252<sup>T<\/sup>, strain DSM 4253, and strain PRI 493 were characterized. Bioreactor cultivations were used for pressurized liquid extraction and analyzed by ultra-high performance supercritical fluid chromatography with diode array and quadropole time-of-flight mass spectrometry detection (UHPSFC-DAD-QTOF \/ MS). Salinixanthin, a carotenoid originally found in\u00a0<em>Salinibacter ruber<\/em>\u00a0and previously detected in strain DSM 4253, was identified in all three\u00a0<em>R. marinus<\/em>\u00a0strains, both in the hydroxylated and nonhydroxylated form. Furthermore, an additional and structurally distinct carotenoid was detected in the three strains. MS \/ MS fragmentation implied that the mass difference between salinixanthin and the novel carotenoid structure corresponded to the absence of a 4-keto group on the \u00df-ionone ring. The study confirmed the lack of carotenoids for the strain SB-71 (<em>\u0394trpB\u0394purAcrtBI &#039;:: trpB<\/em>) in which genes encoding two enzymes of the proposed pathway are partially deleted. Moreover, antioxidant capacity was detected in extracts of all the examined\u00a0<em>R. marinus<\/em>\u00a0strains and found to be 2\u20134 times lower for the knock-out strain SB-71. A gene cluster with 11 genes in two operons in the\u00a0<em>R. marinus<\/em>DSM 4252<sup>T<\/sup>\u00a0genome was identified and analyzed, in which several genes were matched with carotenoid biosynthetic pathway genes in other organisms.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1002\/mbo3.536\">Link to article<\/a><\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>Rhodothermus marinus,\u00a0a marine aerobic thermophile, was first isolated from an intertidal hot spring in Iceland. In recent years, the\u00a0R. marinus\u00a0strain [&hellip;]<\/p>\n","protected":false},"author":1,"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-37675","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>Characterization of carotenoids in\u00a0Rhodothermus marinus - 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\/characterization-of-carotenoids-in-rhodothermus-marinus\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Characterization of carotenoids in\u00a0Rhodothermus marinus - Mat\u00eds\" \/>\n<meta property=\"og:description\" content=\"Rhodothermus marinus,\u00a0a marine aerobic thermophile, was first isolated from an intertidal hot spring in Iceland. 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