{"id":13893,"date":"2017-06-26T00:00:05","date_gmt":"2017-06-26T07:00:05","guid":{"rendered":"https:\/\/vermont.salk.edu\/?post_type=disclosure&#038;p=13893"},"modified":"2023-12-08T09:53:21","modified_gmt":"2023-12-08T17:53:21","slug":"new-method-rapidly-map-social-networks-proteins","status":"publish","type":"disclosure","link":"https:\/\/www.salk.edu\/zh\/news-release\/new-method-rapidly-map-social-networks-proteins\/","title":{"rendered":"New method to rapidly map the \u201csocial networks\u201d of proteins"},"content":{"rendered":"<p>LA JOLLA\u2014Salk scientists have developed a new high-throughput technique to determine which proteins in a cell interact with each other. Mapping this network of interactions, or \u201cinteractome,\u201d has been slow going in the past because the number of interactions that could be tested at once was limited. The new approach, published June 26 in <a href=\"http:\/\/www.nature.com\/nmeth\/journal\/vaop\/ncurrent\/full\/nmeth.4343.html\" target=\"_blank\" rel=\"noopener\"><em>Nature Methods<\/em><\/a>, lets researchers test millions of relationships between thousands of proteins in a single experiment.<\/p>\n<figure id=\"attachment_13898\"  class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" width=\"458\" height=\"493\" class=\"img-responsive wp-image-13898 size-col-md-5\" src=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1-458x493.jpg\" alt=\"\" srcset=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1-458x493.jpg 458w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1-278x300.jpg 278w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1-147x158.jpg 147w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1-300x323.jpg 300w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1-585x630.jpg 585w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1-553x596.jpg 553w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1.jpg 633w\" sizes=\"auto, (max-width: 458px) 100vw, 458px\" \/><figcaption class=\"wp-caption-text\">A new mapping method let researchers discover new links (gray lines) between two groups of plant proteins (yellow and blue) that have a common structure (the BBX domain), suggesting many different combinations of interactions, rather than a few, are involved in coordinating cellular programs like flowering time and circadian rhythm. <\/p>\n<p><a href=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/ecker-interactome-without-legend1.jpg\" target=\"_blank\" rel=\"noopener noreferrer\">Click here<\/a> for a high-resolution image <\/p>\n<p>Credit: Salk Institute<\/figcaption><\/figure>\n<p>\u201cThe power of this new approach is in the ability we now have to scale it up,\u201d says senior author <a href=\"https:\/\/www.salk.edu\/zh\/scientist\/joseph-ecker\/\">\u7ea6\u745f\u592b\u00b7\u57c3\u514b\u5c14<\/a>, professor and director of Salk&#8217;s Genomic Analysis Laboratory and investigator of the Howard Hughes Medical Institute. \u201cThis assay has the potential to begin to address questions about fundamental biological interactions that we haven\u2019t been able to address before.\u201d<\/p>\n<p>The interactome of a cell, like a map of social networks, lets scientists see who\u2019s working with who in the world of proteins. This helps them figure out the roles of different proteins and piece together the different players in molecular pathways and processes. If a newly discovered protein interacts with lots of other proteins involved in cellular metabolism, for instance, researchers can deduce that\u2019s a likely role for the new protein and potentially target it for treatments related to metabolic dysfunction.<\/p>\n<p>Until now, researchers have typically relied on standard high-throughput yeast two-hybrid (Y2H) assays to determine the interactions between proteins. The system requires using a single known protein\u2014known as the \u201cbait\u201d\u2014to screen against a pool of \u201cprey\u201d proteins. But finding all the interactions between, for instance, 1,000 proteins, would require 1000 separate experiments to screen once for each bait\u2019s interaction partners.<\/p>\n<p>&#8220;Current technologies essentially require that interactions detected in primary screening get retested individually,&#8221; says Shelly Trigg, an NSF Graduate Research Fellow at the <a href=\"https:\/\/ucsd.edu\/\" target=\"_blank\" rel=\"noopener noreferrer\">University of California, San Diego<\/a>, in the Ecker lab, and first author of the new paper. &#8220;That may no longer be necessary with the screening depth this approach achieves.&#8221;<\/p>\n<p>In their new method, Ecker, Trigg and their colleagues added a twist to the standard Y2H assay for a much more effective way of measuring the interactome. The genes for two proteins, each on their own circle of DNA, are added to the same cell. If the proteins of interest interact inside the cell, a gene called Cre is activated. When turned on, Cre physically splices the two individual circles of DNA together, thus pairing the genes of interacting proteins together so the team can easily find them through sequencing. The team can generate a massive library of yeast cells\u2014each containing different pairs of proteins by introducing random combinations of genes on circular DNA called plasmids. When cells are positive for a protein interaction, the researchers can use genetic sequencing to figure out what the two proteins interacting are, using new high-throughput DNA sequencing technologies similar to those used for human genome sequencing. This way, they\u2019re no longer limited to testing one \u201cbait\u201d protein at a time, but could test the interactions between all the proteins in a library at once.<\/p>\n<figure id=\"attachment_13944\"  class=\"wp-caption alignright\"><a href=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"945\" height=\"593\" class=\"img-responsive wp-image-13944 size-col-md-10\" src=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-945x593.jpg\" alt=\"\" srcset=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-945x593.jpg 945w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-300x188.jpg 300w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-768x482.jpg 768w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-1024x643.jpg 1024w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-147x92.jpg 147w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-458x288.jpg 458w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-585x367.jpg 585w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-553x347.jpg 553w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom-750x471.jpg 750w, https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom.jpg 2000w\" sizes=\"auto, (max-width: 945px) 100vw, 945px\" \/><\/a><figcaption class=\"wp-caption-text\">Joseph Ecker (courtesy of Salk Institute) and Shelly Trigg (courtesy of Austin Trigg) <\/p>\n<p><a href=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2017\/06\/Joseph-Ecker_Shelly-GrowRoom.jpg\" target=\"_blank\" rel=\"noopener noreferrer\">Click here<\/a> for a high-resolution image.<\/figcaption><\/figure>\n<p>Ecker\u2019s group tested the new method, dubbed CrY2H-seq, on all the transcription factors\u2014a large class of proteins\u2014in the plant <em>Arabidopsis<\/em>.<\/p>\n<p>\u201cWhen you take 1,800 proteins and test the interactions among them, that\u2019s nearly 4 million combinations,\u201d says Ecker. \u201cWe did that ten times in a matter of a month.\u201d<\/p>\n<p>They revealed more than 8,000 interactions among those proteins tested, giving them new insight into which <em>Arabidopsis <\/em>transcription factors interact with each other. The data, they say, helps answer longstanding questions about whether certain groups of transcription factors have set functions. Some of the poorly understood transcription factors, they found, interact with more well-understood factors that regulate the plant\u2019s response to auxin, a hormone involved in coordinating plant growth.<\/p>\n<p>In the future, the method could be scaled up to test larger sets of proteins\u2014human cells, for instance, contain about 20,000 different proteins. This easier and faster method to determine the entire interactome of a cell also opens up the possibility of studying how the interactome changes under different conditions\u2014an experiment that\u2019s never been possible in the past.<\/p>\n<p>Other researchers on the study were Renee Garza, Andrew MacWilliams, Joseph Nery, Anna Bartlett, Rosa Castanon, Adeline Goubil, Joseph Feeney, Ronan O\u2019Malley, Shao-shan Carol Huang, Zhuzhu Zhang, and Mary Galli of the Salk Institute.<\/p>\n<p>The work and the researchers involved were supported by grants from the <a href=\"https:\/\/energy.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\">U.S. Department of Energy<\/a>, <a href=\"https:\/\/www.nsfgrfp.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">National Science Foundation Graduate Research Fellowship Program<\/a>, <a href=\"http:\/\/www.hhmi.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">Howard Hughes Medical Institute<\/a>, and <a href=\"http:\/\/www.chapmantrusts.org\/index.php\" target=\"_blank\" rel=\"noopener noreferrer\">Mary K. Chapman Foundation<\/a>.<\/p>","protected":false},"featured_media":13896,"template":"","faculty":[42],"disease-research":[125,451,452],"class_list":["post-13893","disclosure","type-disclosure","status-publish","has-post-thumbnail","hentry","faculty-joseph-ecker","disease-research-plant-biology","disease-research-plant-genomics","disease-research-plant-physiology"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>New method to rapidly map the \u201csocial networks\u201d of proteins - Salk Institute for Biological Studies<\/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:\/\/www.salk.edu\/zh\/news-release\/new-method-rapidly-map-social-networks-proteins\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New method to rapidly map the \u201csocial networks\u201d of proteins - Salk Institute for Biological Studies\" \/>\n<meta property=\"og:description\" content=\"LA JOLLA\u2014Salk scientists have developed a new high-throughput technique to determine which proteins in a cell interact with each other. 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