{"id":26898,"date":"2010-12-12T19:00:00","date_gmt":"2010-12-12T18:00:00","guid":{"rendered":"https:\/\/www.embl.org\/news\/?p=26898"},"modified":"2024-11-14T16:30:46","modified_gmt":"2024-11-14T15:30:46","slug":"how-cells-export-and-embed-proteins-in-the-membrane","status":"publish","type":"post","link":"https:\/\/www.embl.org\/news\/science\/how-cells-export-and-embed-proteins-in-the-membrane\/","title":{"rendered":"How cells export and embed proteins in the membrane"},"content":{"rendered":"\n<div class=\"wp-block-image\"><figure class=\"vf-figure  | vf-figure--align vf-figure--align-inline-start   size-large is-resized\"><a href=\"https:\/\/www.embl.org\/news\/?attachment_id=26916\"><img loading=\"lazy\" decoding=\"async\" class=\"vf-figure__image\" src=\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2010\/12\/ribosome-ed-structure-704x1024.jpg\" alt=\"This cryo-electron microscopy image shows the 3D structure of the ribosome (yellow\/blue) bound to the signal recognition particle (SRP) and the SRP receptor (both in red). Below it is an atomic model of SRP (green-yellow\/orange) and its receptor (pink). Image credits: EMBL\/Schaffitzel.\" class=\"wp-image-26916\" width=\"176\" height=\"256\" srcset=\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2010\/12\/ribosome-ed-structure-704x1024.jpg 704w, https:\/\/www.embl.org\/news\/wp-content\/uploads\/2010\/12\/ribosome-ed-structure-206x300.jpg 206w, https:\/\/www.embl.org\/news\/wp-content\/uploads\/2010\/12\/ribosome-ed-structure-768x1116.jpg 768w, https:\/\/www.embl.org\/news\/wp-content\/uploads\/2010\/12\/ribosome-ed-structure.jpg 800w\" sizes=\"auto, (max-width: 176px) 100vw, 176px\" \/><\/a><figcaption class=\"vf-figure__caption\">This cryo-electron microscopy image shows the 3D structure of the ribosome (yellow\/blue) bound to the signal recognition particle (SRP) and the SRP receptor (both in red). Below it is an atomic model of SRP (green-yellow\/orange) and its receptor (pink).\n\nImage credits: EMBL\/Schaffitzel.<\/figcaption><\/figure><\/div>\n\n\n\n<p>Like an overprotective parent on the first day of school, a targeting factor sometimes needs a little push to let go of its cargo. Scientists at the European Molecular Biology Laboratory (EMBL) in Grenoble, France, have visualised one such hand-over. They were the first to determine the structure of a ribosome-protein complex involved in carrying nascent proteins out of the cell. Their work, published online today in<em> Nature Structural and Molecular Biology<\/em>, could increase understanding of illnesses such as cystic fibrosis and some forms of Parkinson\u2019s disease, in which improper protein targeting leads proteins to harmfully accumulate inside cells.<\/p>\n\n\n\n<p>In most organisms, proteins destined to cross or be embedded in a membrane contain a polypeptide sequence that is recognized during translation by a targeting factor known as the signal recognition particle (SRP). SRP binds to the ribosome synthesizing the polypeptide, and subsequently also binds an SRP receptor, located next to the machinery that transfers proteins across the membrane and out of the cell. EMBL scientists have now generated the first-ever structural image of this important step in the process.<\/p>\n\n\n\n<p>\u201cThe SRP receptor acts as a switch between the cargo binding and the release,\u201d says Christiane Schaffitzel, who led the research at EMBL, \u201cNow we have seen for the first time how the release can happen at a molecular level.\u201d<\/p>\n\n\n\n<p>Schaffitzel\u2019s group is taking structural snapshots of entire pathways by which proteins are synthesized and targeted to their final positions. To capture this hand-over step, the scientists had to overcome the fact that the link between SRP and its receptor is usually transient, chemically unstable. They engineered the SRP receptor so that it would bind more stably to SRP, then introduced ribosomes and observed the resulting complexes using cryo-electron microscopy (cryo-EM).<\/p>\n\n\n\n<p>Cryo-EM can be performed in roughly physiological conditions, providing a picture that closely resembles what happens in living cells. This picture can then be combined with higher-resolution crystallography data and biochemical studies \u2013 an exciting hybrid approach the EMBL scientists will further exploit to follow protein targeting all the way from start to finish.<\/p>\n\n\n\n<p>A particular asset for success in this project was the close collaboration with Guy Schoehn at the Institut de Biologie Structurale (IBS). IBS and EMBL are part of the <a href=\"https:\/\/www.embl.org\/partnerships\/local\/structural-biology\/\" target=\"_blank\" rel=\"noreferrer noopener\">Partnership for Structural Biology (PSB)<\/a> in Grenoble, France.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Like an overprotective parent on the first day of school, a targeting factor sometimes needs a little push to let go of its cargo. Scientists at the European Molecular Biology Laboratory (EMBL) in Grenoble, France, have visualised one such hand-over. They were the first to determine the structure&hellip;<\/p>\n","protected":false},"author":16,"featured_media":26916,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,17591],"tags":[718,37,1748,2046,35],"embl_taxonomy":[9792,5148],"class_list":["post-26898","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-science-technology","tag-cryo-em","tag-grenoble","tag-press-release","tag-schaffitzel","tag-structural-biology","embl_taxonomy-embl-grenoble","embl_taxonomy-structural-biology-embl-grenoble"],"acf":{"show_featured_image":true,"vf_locked":false,"featured":false,"article_intro":"<p>EMBL scientists first to visualise crucial step<\/p>\n","article_sources":[{"source_description":"<p>Estrozi, L.F., Boehringer, D., Shan, S., Ban, N., Schaffitzel, C.. Cryo-EM structure of the E. coli translating ribosome in complex with SRP and its receptor. <em>Nature Structural and Molecular Biology<\/em>, Advance Online Publication 12 December 2010. DOI: 10.1038\/nsmb.1952.<\/p>\n","source_link_url":"https:\/\/www.nature.com\/articles\/nsmb.1952"}],"related_links":false,"in_this_article":false,"color":"#007B53","youtube_url":"","mp4_url":"","video_caption":"","press_contact":"EMBL Generic","source_article":false,"field_target_display":"embl"},"embl_taxonomy_terms":[{"uuid":"a:3:{i:0;s:36:\"b14d3f13-5670-44fb-8970-e54dfd9c921a\";i:1;s:36:\"89e00fee-87f4-482e-a801-4c3548bb6a58\";i:2;s:36:\"8f81131e-d37c-470c-848f-618fce652295\";}","parents":[],"name":["EMBL Grenoble"],"slug":"embl-grenoble","description":"Where &gt; All EMBL sites &gt; EMBL Grenoble"},{"uuid":"a:3:{i:0;s:36:\"302cfdf7-365b-462a-be65-82c7b783ebf7\";i:1;s:36:\"7ca3ce91-dc32-47ea-8d4b-7a53c3a3a9fd\";i:2;s:36:\"fc528877-4017-438f-85b4-de2b54c443f1\";}","parents":[],"name":["Structural Biology (EMBL Grenoble)"],"slug":"structural-biology-embl-grenoble","description":"What &gt; Research Units &gt; Structural Biology (EMBL Grenoble)"}],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How cells export and embed proteins in the membrane | EMBL<\/title>\n<meta name=\"description\" content=\"EMBL scientists were the first to determine the structure of a ribosome-protein complex involved in carrying nascent proteins out of the cell.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.embl.org\/news\/science\/how-cells-export-and-embed-proteins-in-the-membrane\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How cells export and embed proteins in the membrane | EMBL\" \/>\n<meta property=\"og:description\" content=\"EMBL scientists were the first to determine the structure of a ribosome-protein complex involved in carrying nascent proteins out of the cell.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.embl.org\/news\/science\/how-cells-export-and-embed-proteins-in-the-membrane\/\" \/>\n<meta property=\"og:site_name\" content=\"EMBL\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/embl.org\/\" \/>\n<meta property=\"article:published_time\" content=\"2010-12-12T18:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-14T15:30:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2010\/12\/ribosome-ed-structure.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"1163\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Guest author(s)\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@embl\" \/>\n<meta name=\"twitter:site\" content=\"@embl\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Guest author(s)\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\/\/www.embl.org\/news\/science\/how-cells-export-and-embed-proteins-in-the-membrane\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/how-cells-export-and-embed-proteins-in-the-membrane\/\"},\"author\":{\"name\":\"Guest author(s)\",\"@id\":\"https:\/\/www.embl.org\/news\/#\/schema\/person\/b4d9366b2ebe691c4015c64c3619205b\"},\"headline\":\"How cells export and embed proteins in the membrane\",\"datePublished\":\"2010-12-12T18:00:00+00:00\",\"dateModified\":\"2024-11-14T15:30:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/how-cells-export-and-embed-proteins-in-the-membrane\/\"},\"wordCount\":436,\"publisher\":{\"@id\":\"https:\/\/www.embl.org\/news\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/how-cells-export-and-embed-proteins-in-the-membrane\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2010\/12\/ribosome-ed-structure.jpg\",\"keywords\":[\"cryo-em\",\"grenoble\",\"press release\",\"schaffitzel\",\"structural biology\"],\"articleSection\":[\"Science\",\"Science &amp; 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