{"id":14252,"date":"2016-05-26T10:33:09","date_gmt":"2016-05-26T17:33:09","guid":{"rendered":"https:\/\/sop.washington.edu\/?p=14252"},"modified":"2025-12-04T11:42:09","modified_gmt":"2025-12-04T19:42:09","slug":"lee-lab-uses-3d-electron-microscopy-visualize-influenza-virus-invasion","status":"publish","type":"post","link":"https:\/\/staff.washington.edu\/twentzel\/wordpress\/lee-lab-uses-3d-electron-microscopy-visualize-influenza-virus-invasion\/","title":{"rendered":"Lee lab uses 3D electron microscopy to visualize influenza virus invasion"},"content":{"rendered":"<h3>For the first time, researchers have images showing how a virus pries its way past host membranes<\/h3>\n<figure id=\"attachment_14255\" aria-describedby=\"caption-attachment-14255\" style=\"width: 1024px\" class=\"figure figure-caption wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14255 size-large\" src=\"https:\/\/sop.washington.edu\/wp-content\/uploads\/Kelly_Lee_Team-1024x683.jpg\" alt=\"The Lee lab team at work decoding the influenza virus\u2019 secrets (from L to R: Associate Professor Kelly Lee, James Williams, and Nancy Horn, PhD).\" width=\"1024\" height=\"683\" srcset=\"https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Team-1024x683.jpg 1024w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Team-300x200.jpg 300w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Team-768x512.jpg 768w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Team-250x167.jpg 250w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Team-620x414.jpg 620w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Team.jpg 2048w\" sizes=\"auto, 100vw\" \/><figcaption id=\"caption-attachment-14255\" class=\"wp-caption-text\">The Lee lab team at work decoding the influenza virus\u2019 secrets (from L to R: Associate Professor Kelly Lee, James Williams, and Nancy Horn, PhD). <span class=\"wp-media-credit\">Photo: Alex Levine Photography<\/span><\/figcaption><\/figure>\n<p>Three to five million people worldwide suffer from the flu each year\u2014and it\u2019s deadly. The World Health Organization (WHO) estimates that 250,000 to 500,000 people a year die from the flu. The people most at risk are those with compromised immune systems: children, older adults, people with immunosuppressive illnesses, and the unvaccinated.<\/p>\n<p>But if you get the flu, those numbers just don\u2019t seem to matter. You feel terrible\u2014like you\u2019ve been slammed by a giant bag of concrete. You lose strength and collapse into bed with fever, chills, aches, pains and more. Your body is all out of sorts. You feel like a zombie. Total dysfunction.<\/p>\n<p>When you have the flu, you <em>are<\/em> out of sorts\u2014right down to the molecular level.<\/p>\n<p>Thanks to some advanced electron microscopy from UW School of Pharmacy\u2019s <a href=\"http:\/\/faculty.washington.edu\/kklee\/Welcome.html\" target=\"_blank\">Associate Professor of Medicinal Chemistry Kelly Lee\u2019s laboratory<\/a>, we are starting to understand how the influenza virus aggressively pries its way into cells. The team\u2019s research may eventually lead to improvements in prevention and treatments for the flu and other similar viruses like HIV, herpes, dengue and Zika\u2014diseases that affect millions worldwide every year.<\/p>\n<p>The <a href=\"http:\/\/jvi.asm.org\/content\/early\/2016\/05\/19\/JVI.00240-16.full.pdf+html\" target=\"_blank\"><em>Journal of Virology<\/em><\/a> published this break-through study in which, for the first time, Lee\u2019s team captured 3-dimensional nanoscopic images of the molecular events that the flu virus carries out in order to fuse itself with a host cell and start a new infection. To create the 3D images, the team is riding a wave of new applications of cryo-electron microscopy (cryo-EM). These powerful electron microscopes, and the next generation cameras they use, are making it possible to obtain unprecedented glimpses into structures of protein machinery and viruses.<\/p>\n<p>They take the protein and virus in a buffer and without fixing or staining the specimen, flash freeze it by plunging the specimen into cryogenic liquid ethane. With that kind of cold, the sample freezes before the water can crystallize, which preserves the proteins and membranes in their native states. Like in an X-ray CAT scan, they tilt the samples to get different views of the viruses undergoing fusion and then use powerful computational methods to reconstruct the 3-dimensional image.<\/p>\n<p>Flu viruses are \u201cenveloped\u201d viruses, and like HIV, herpes, dengue and the Zika viruses, they have a lipid membrane that protects their genetic material. To deliver its genome into cells, the virus needs to merge this membrane \u201cenvelope\u201d with the host\u2019s cellular membrane. With better insight into the mechanics of this process, researchers may gain an understanding of how to interfere with this stage of cell entry and prevent infection. Indeed, antibodies produced by our immune systems target and in some cases jam the protein machinery that viruses use to gain entry into cells.<\/p>\n<figure id=\"attachment_14256\" aria-describedby=\"caption-attachment-14256\" style=\"width: 350px\" class=\"figure figure-caption wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14256\" src=\"https:\/\/sop.washington.edu\/wp-content\/uploads\/Kelly_Lee_Flu_Fusion_PR_May_2016-250x207.png\" alt=\"How the influenza virus engages with membranes as it would in infecting a host cell\" width=\"350\" height=\"290\" srcset=\"https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Flu_Fusion_PR_May_2016-250x207.png 250w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Flu_Fusion_PR_May_2016-300x249.png 300w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Flu_Fusion_PR_May_2016-768x637.png 768w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Flu_Fusion_PR_May_2016-1024x849.png 1024w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Flu_Fusion_PR_May_2016-620x514.png 620w, https:\/\/staff.washington.edu\/twentzel\/wordpress\/wp-content\/uploads\/Kelly_Lee_Flu_Fusion_PR_May_2016.png 1105w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/><figcaption id=\"caption-attachment-14256\" class=\"wp-caption-text\">How the influenza virus engages with membranes as it would in infecting a host cell <span class=\"wp-media-credit\">Photo: Kelly Lee<\/span><\/figcaption><\/figure>\n<p>Flu viruses are covered in spikes. Their external membranes are decorated with fusion protein, known as \u201cspike complexes\u201d\u2014 because they look just like that \u2013 little spikes arrayed across the virus\u2019 surface. As the virus makes its way through your body, those spikes make contact with healthy cells. They grapple onto the membrane of the healthy cell (or target) and then draw the target membrane towards the virus, creating a dimple in the target surface. The spikes then attach, or pinch, the membrane and draw it closer to the virus, not unlike a tractor beam out of science fiction. When the target membrane is pulled tight, or docked, to the surface of the virus, there is a fusion that happens between the cell\u2019s membrane and the virus\u2019 membrane. These cell and viral leaflets join together to open a channel through which the virus delivers its genome to the cell.<\/p>\n<p>This breakthrough study allowed the team to look at the different stages of the membrane fusion event and figure out the sequence in which they occur. Prior to this, \u201cThe field had a lot of indirect information from lower resolution techniques but now for the first time we are able to look at these processes at pretty high resolution and see the proteins, the membranes and how they become contorted and remodeled as the virus carries out membrane fusion. Most of the structures we see for membranes and how they get deformed are somewhat unexpected. It\u2019s surprising and exciting when you see how these events are taking place at the molecular level,\u201d said Lee.<\/p>\n<p>The team\u2019s research continues. \u201cWe hope go further in our research with enveloped viruses and are working with other departments to bring more electron microscopy resources to the UW,\u201d shared Lee. \u201cThere is strong demand among researchers in many areas of biological sciences to use these types of microscopes and harness their capabilities to help us understand cellular processes at the nanoscopic level.\u201d Beyond enveloped viruses, membrane fusion also is at the heart of basic cell biology and is a critical step in sperm-egg fertilization and signaling across nerve synapses, for example. The Lee lab hopes that their work on the influenza virus case may also help to improve the understanding of these fundamental functions in the life of cells.<\/p>\n<p>Also: UW Health Sciences NewsBeat\u00a0<a href=\"http:\/\/hsnewsbeat.uw.edu\/story\/lab-uses-electron-microscopy-visualize-flu-virus-invasion\" target=\"_blank\">Lab uses electron microscopy to visualize flu virus\u00a0invasion: Pharmacy team&#8217;s images are first to capture virus infecting healthy cell<\/a><\/p>\n<h4>Are you interested in studying with preeminent scientists like Associate Professor Kelly Lee?<\/h4>\n<p><a href=\"https:\/\/sop.washington.edu\/department-of-medicinal-chemistry\/phd-program\/\">Apply to our Medicinal Chemistry PhD Program<\/a><\/p>\n<p><a href=\"\/department-of-medicinal-chemistry\/department-info-2\/department-news\/\">Link to Medicinal Chemistry archived news<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>For the first time, researchers have images showing how a virus pries its way past host membranes Three to five million people worldwide suffer from the flu each year\u2014and it\u2019s deadly. The World Health Organization&#8230;<\/p>\n","protected":false},"author":3,"featured_media":14257,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[32,31],"tags":[131,82,130,128,129,132],"class_list":["post-14252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medchem-news","category-sop-news","tag-dengue","tag-hiv","tag-influenza","tag-kelly-lee","tag-virology","tag-zika"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lee lab uses 3D electron microscopy to visualize influenza virus invasion - School of Pharmacy<\/title>\n<meta name=\"description\" content=\"For the first time, researchers have images showing 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