{"id":55758,"date":"2025-12-15T15:20:26","date_gmt":"2025-12-15T15:20:26","guid":{"rendered":"https:\/\/matis.is\/new-matis-is\/?p=55758"},"modified":"2025-12-15T15:20:45","modified_gmt":"2025-12-15T15:20:45","slug":"a-cold-adapted-endo-fucoidanase-psf1-from-pseudoalteromonas-sp-that-catalyzes-production-of-t-cell-activating-fucoidan-oligosaccharides-from-saccharina-latissimafucoidan","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/greinar\/a-cold-adapted-endo-fucoidanase-psf1-from-pseudoalteromonas-sp-that-catalyzes-production-of-t-cell-activating-fucoidan-oligosaccharides-from-saccharina-latissimafucoidan\/","title":{"rendered":"A cold-adapted\u00a0endo-fucoidanase Psf1 from\u00a0Pseudoalteromonas\u00a0sp. that catalyzes production of T-cell activating fucoidan oligosaccharides from\u00a0Saccharina latissima fucoidan"},"content":{"rendered":"<p>Bioactive sulfated fucoidans have high fucose content and are derived from brown seaweeds. Here we report the discovery of the first cold-adapted\u00a0<em>endo<\/em>-\u03b1(1\u00a0\u2192\u00a03)-fucoidanase (EC 3.2.1.211), Psf1. The\u00a0<em>psf1<\/em>\u00a0gene was found in the genome of\u00a0<em>Pseudoalteromonas<\/em>\u00a0sp. S3178, a bacterium isolated from a shrimp near Antarctica. Phylogenetic analyses designated Psf1 as a putative member of glycoside hydrolase family 107 (GH107). Substrate selectivity analysis confirmed Psf1 as being\u00a0<em>endo<\/em>-acting and indicated that the enzyme catalyzes hydrolysis of \u03b1(1\u00a0\u2192\u00a03)-glycosidic fucoidan linkages. Psf1 had temperature optimum of 10\u201330\u00a0\u00b0C but retained activity at 1\u00a0\u00b0C. Structural modeling indicated similarity to the crystal structure of P5A_FcnA (<em>Psychromonas<\/em>\u00a0sp. SW5A), yet distinct high variability regions were identified by RMSF. Psf1 released low molecular weight fucoidan oligosaccharides from\u00a0<em>Saccharina latissima<\/em>fucoidan that dose-dependently reduced IL-12p40 secretion in dendritic cells, and lowered IFN-\u03b3 and IL-10 levels in dendritic cells co-cultured with allogeneic CD4<sup>+<\/sup>\u00a0T-cells, without affecting IL-17 secretion, indicating a suppression of Th1-mediated immune response. Treatment of dendritic cells with native fucoidan from\u00a0<em>S. latissima<\/em>\u00a0did not affect cell viability or cytokine secretion. These findings have potential to enable new enzyme-assisted production, at low temperatures, of bioactive fucoidan oligosaccharides from\u00a0<em>S. latissima<\/em>\u00a0grown in the Northern Hemisphere.<\/p>","protected":false},"excerpt":{"rendered":"<p>Bioactive sulfated fucoidans have high fucose content and are derived from brown seaweeds. Here we report the discovery of the [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","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":[2548,2549],"class_list":["post-55758","post","type-post","status-publish","format-standard","hentry","category-greinar","tag-gh107","tag-immune-modulation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A cold-adapted\u00a0endo-fucoidanase Psf1 from\u00a0Pseudoalteromonas\u00a0sp. that catalyzes production of T-cell activating fucoidan oligosaccharides from\u00a0Saccharina latissima fucoidan - 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\/a-cold-adapted-endo-fucoidanase-psf1-from-pseudoalteromonas-sp-that-catalyzes-production-of-t-cell-activating-fucoidan-oligosaccharides-from-saccharina-latissimafucoidan\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A cold-adapted\u00a0endo-fucoidanase Psf1 from\u00a0Pseudoalteromonas\u00a0sp. that catalyzes production of T-cell activating fucoidan oligosaccharides from\u00a0Saccharina latissima fucoidan - Mat\u00eds\" \/>\n<meta property=\"og:description\" content=\"Bioactive sulfated fucoidans have high fucose content and are derived from brown seaweeds. 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