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}) })(jQuery); </script> </head> <body class="post-template-default single single-post postid-1361 single-format-standard header-image full-width-content genesis-breadcrumbs-visible"><div class="site-container"><header class="site-header"><div class="wrap"><div class="title-area"><p class="site-title"><a href="https://www.thermofisher.com/" title="Thermo Fisher Scientific">Thermo Fisher Scientific</a></p><p class="site-description">Electron and cryo-electron microscopy stories and solutions about the advancement of cellular and structural biology</p></div><div class="widget-area header-widget-area"><section id="block-5" class="widget widget_block"><div class="widget-wrap"> <div class="wp-block-group"><div class="wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow"></div></div> </div></section> <section id="block-6" class="widget widget_block"><div class="widget-wrap"> <div class="wp-block-group"><div class="wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow"></div></div> </div></section> </div><div class="breadcrumb"><span class="breadcrumb-link-wrap"><a href="https://www.thermofisher.com/blog/?">Accelerating Science</a></span><span class="breadcrumb-link-wrap"><a class="breadcrumb-link" href="https://www.thermofisher.com/blog/atomic-resolution/"><span class="breadcrumb-link-text-wrap">Life in Atomic Resolution</span></a><meta ></span> <span aria-label="breadcrumb separator">/</span> <span class="breadcrumb-link-wrap"><a class="breadcrumb-link" href="https://www.thermofisher.com/blog/atomic-resolution/uncategorized/"><span class="breadcrumb-link-text-wrap">Uncategorized</span></a><meta ></span> <span aria-label="breadcrumb separator">/</span> <span class="breadcrumb-current-title">Advanced Characterization Unravels Ebola Virus Structure and Behavior</span></div></div></header> <section class="hero-banner" style="background-image:url(https://www.thermofisher.com/blog/atomic-resolution/wp-content/uploads/sites/22/2024/01/Ebola-Blog-Header-Image_1920x800.jpg)"> </section> <div class="site-inner"><div class="content-sidebar-wrap"><main class="content"><article class="post-1361 post type-post status-publish format-standard has-post-thumbnail category-cryo-electron-microscopy-cryo-em category-software category-uncategorized entry" aria-label="Advanced Characterization Unravels Ebola Virus Structure and Behavior"><header class="entry-header"><h1 class="entry-title">Advanced Characterization Unravels Ebola Virus Structure and Behavior</h1> <span class="post-info-author"> By <a href="https://www.thermofisher.com/blog/atomic-resolution/tf-author/rosa-pipitone/" title="Posts by Rosa Pipitone" rel="author">Rosa Pipitone, Marketing Content Specialist, Thermo Fisher Scientific</a> </span> <span class="post-info-date"> 01.16.2024 </span> </header><div class="entry-content"><h2 style="font-size: 100%"><strong>Mechanism of Ebola cell entry is critical for the development of effective therapeutics</strong></h2> <p>The Ebola virus is a notorious illness for both its high contagiousness and lethality, marked by dramatic external bleeding in its later stages. In recent years, there has been great progress in the development of preventative treatments against Ebola and an <a href="https://www.fda.gov/vaccines-blood-biologics/ervebo">FDA approved vaccine has been available since 2019</a>. However, the finer mechanistic behavior of Ebola and the Ebola virus structure remains relatively unknown, which hampers the development of treatments and therapeutics. In particular, capturing the mechanism of Ebola cell entry has been difficult, as it is a highly dynamic process which ends with the delivering of the Ebola virus RNA into the host cell. Researchers from the University Hospital Heidelberg (Germany) have now <a href="https://doi.org/10.15252/embj.2023113578">visualized </a>Ebola virus membrane fusion and cell entry through a combination of cryo-electron tomography (cryo-ET) imaging, digital 3D reconstruction, molecular analysis and membrane modeling.</p> <h2 style="font-size: 100%"><strong>Determining Ebola virus structure and cell entry</strong></h2> <p>Ebola viruses (EBOVs) form filamentous and long virions which enter into the cytoplasm of the host cell through the fusion with endosomal membranes. A matrix layer consisting of the matrix viral protein 40 (VP40) is fundamental to determine the shape and the stability of the EBOVs and forms a scaffold under the viral envelope which is important to protect the genome during the transmission. 聽However, it remains unknown how virions go through the uncoating process, including virion disassembly and release of the nucleocapsid, (which contains the viral genome) into the cytosol. Using cryo-ET, researchers first produce a thin slice of a flash-frozen biological sample with a dedicated cryo-focused ion beam (cryo-FIB), which can mill a specimen down to nanometer thickness. Then, the sample is imaged with a cryo-ET microscope (in 2D) at a series of angles, which are digitally reconstructed into a 3D representation of the sample.</p> <p>In this study, tomograms acquired with Thermo Fisher Scientific Titan Krios 聽showed impressive details of the EBOV virions localized in the endosomes of infected cells (Figure 1). The 3D segmentation and reconstruction of tomograms carried out with <a href="https://ter.li/8m8hbu">Thermo Scientific Amira Software</a> provided incredible details of viral and cellular structures. Researchers visualized membrane fragments and vesicles, which were products of a degradation process that occurred in the host cell. The VP40 matrix appeared disassembled and not attached to the viral envelope as well. Interestingly Amira Software allowed to distinguish key components of the Ebola virus structure such as the envelope, VP40 and the nucleocapsid.</p> <p>By analyzing multiple endosomes and combining their observations with molecular analysis and membrane modeling, they were able to determine that the disassembly of the VP40 matrix occurs at low pH conditions prior to the membrane fusion. The researchers suggest that the EBOV uncoating starts with the disassembly of the VP40 matrix followed by the membrane fusion and release of the nucleocapsid into the cytoplasm.</p> <div id="attachment_1364" style="width: 770px" class="wp-caption aligncenter"><img decoding="async" aria-describedby="caption-attachment-1364" class="wp-image-1364 size-large" title="Ebola virus structure revealed with Amira Software" src="https://www.thermofisher.com/blog/atomic-resolution/wp-content/uploads/sites/22/2024/01/Ebola-blog-1024x898.jpg" alt="Ebola virus structure revealed with Amira Software" width="760" height="666" srcset="https://www.thermofisher.com/blog/atomic-resolution/wp-content/uploads/sites/22/2024/01/Ebola-blog-1024x898.jpg 1024w, https://www.thermofisher.com/blog/atomic-resolution/wp-content/uploads/sites/22/2024/01/Ebola-blog-300x263.jpg 300w, https://www.thermofisher.com/blog/atomic-resolution/wp-content/uploads/sites/22/2024/01/Ebola-blog-768x674.jpg 768w, https://www.thermofisher.com/blog/atomic-resolution/wp-content/uploads/sites/22/2024/01/Ebola-blog.jpg 1067w" sizes="(max-width: 760px) 100vw, 760px" /><p id="caption-attachment-1364" class="wp-caption-text">Cryo-ET process along with resulting 2D images and 3D reconstructions. Segmentation performed with Amira Software clearly distinguishes key components of the Ebola virion. Figure reproduced in part from S.L. Winter, et al. under CC BY 4.0.</p></div> <h2 style="font-size: 100%"><strong>Producing targeted treatments by observing how viruses enter cells</strong></h2> <p>Deconvoluting the way viruses enter our cells is a critical step towards targeted treatments. The behavior of the protein matrix revealed by the team at the University Hospital Heidelberg has provided a promising target for disrupting Ebola鈥檚 ability to infect cells. Their approach, which combines high-resolution cryo-EM with advanced segmentation and molecular modeling, serves as a novel template for the mechanistic investigation of any number of infectious diseases. We are excited to see how such direct observation of virus behavior will guide the development of effective treatments.</p> <p><strong><em>Learn more about Amira Software at聽</em></strong><a href="https://ter.li/8m8hbu" data-uw-rm-brl="false"><strong><em>thermofisher.com/amira</em></strong></a><strong><em>聽>></em></strong></p> <hr /> <p><em>聽Rosa Pipitone PhD is a Marketing Content Specialist at Thermo Fisher Scientific. </em><em>Written in collaboration with Alex Ilitchev PhD, Scientific Editor at Thermo Fisher Scientific.</em></p>  <div class="jp-relatedposts"> <div class="related-post related-1"> <a href="https://www.thermofisher.com/blog/atomic-resolution/what-is-cryo-em-what-is-cryo-electron-microscopy/"><img width="310" height="274" src="https://www.thermofisher.com/blog/atomic-resolution/wp-content/uploads/sites/22/2024/10/cryoEM-blog-virus-pore4-1920x600_Header-310x274.jpg" class="attachment-grid size-grid wp-post-image" alt="cryoEM-blog-virus pore" decoding="async" /></a> 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class="comment-author"> <img alt='' src='httpss://secure.gravatar.com/avatar/f0816241fd754d080ffc64eb1f30a399?s=48&d=mm&r=g' srcset='httpss://secure.gravatar.com/avatar/f0816241fd754d080ffc64eb1f30a399?s=96&d=mm&r=g 2x' class='avatar avatar-48 photo' height='48' width='48' loading='lazy' decoding='async'/><span class="comment-author-name">Nathalie silvina Rodriguez Rojas</span> <span class="says">says</span> </p> <p class="comment-meta"><time class="comment-time"><a class="comment-time-link" href="https://www.thermofisher.com/blog/atomic-resolution/advanced-characterization-unravels-ebola-virus-structure-and-behavior/#comment-792">October 10, 2024 at 6:03 am</a></time></p> </header> <div class="comment-content"> <p>Yes</p> </div> <div class="comment-reply"><a rel='nofollow' class='comment-reply-link' href='#comment-792' data-commentid="792" data-postid="1361" data-belowelement="article-comment-792" data-respondelement="respond" data-replyto="Reply to Nathalie silvina Rodriguez Rojas" 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