Opening the door to potential treatments for the deadly Ebola virus, scientists have found that a protein made by the virus plays a role similar to that of a coat-check attendant. The protein removes a protective coat from the virus’s genetic material, exposing the viral genome so that it can be copied, and then returns the coat, according to new research from Washington University, Icahn School of Medicine, University of Texas Southwestern, Texas Biomedical Research Institute and Baylor University. The research, in cell cultures, showed that interfering with this process kills the virus.
As part of the current study, the researchers introduced rogue coat-check attendants into Ebola-infected cells. These rogue attendants carried a short chain of amino acids that forms the part of the protein that removes the coat. But they lacked the ability to return the coat, disrupting the emergence of newly created viruses from infected cells. Consequently, the virus did not survive.
This coat-check protein, known as VP35, has a great deal of potential as a new target for Ebola treatments state the team. If the medical community can block this process, they can stop Ebola infection by blocking viral replication. The opensource study is published in the journal Cell Reports.
The Ebola outbreak that began last year in West Africa has infected nearly 25,000 people and killed more than 10,000, according to the Centers for Disease Control and Prevention. Ebola and other viruses like it are made of a single strand of RNA, a genetic material closely related to DNA. Higher organisms use RNA to copy protein-building instructions from their DNA, but Ebola stores such instructions, the virus’s genetic self, directly in RNA. RNA is less stable than DNA and can set off immune defenses that destroy viruses. So Ebola keeps its RNA covered with a protective coat called the nucleoprotein, explain the team.
To replicate, however, the virus has to partially remove the nucleoprotein and expose its RNA to the viral copying machinery. The team have spent the past seven years studying the role of VP35, a viral protein involved in the replication process.
One of the major challenges was that the part of VP35 involved in this interaction is an intrinsically disordered peptide state the team, adding that this means that it may not take on a definite structure until it binds to another protein. That made structural studies of VP35 difficult because the structure, which plays a critical role in determining function, doesn’t form without its specific binding partner.
The researchers showed that VP35 binds to the virus’s nucleoprotein, which forms part of the protective coat worn by the virus’ RNA. The current study showed that this binding removes the nucleoprotein from the viral RNA prior to replication. And while the viral RNA is being copied, VP35 keeps newly synthesized nucleoproteins from attaching to other RNA in the host cell.
New copies of the virus require new protein coats. So VP35 also ensures that new nucleoproteins, made by the host cell’s protein-making machinery, bind only to Ebola RNA, allowing the virus to complete replicating. The team surmise that disabling or disrupting VP35 could stop the virus in its tracks.
Michelle Petersen is the founder of Healthinnovations, having worked in the health and science industry for over 21 years, which includes tenure within the NHS and Oxford University. Healthinnovations is a publication that has reported on, influenced, and researched current and future innovations in health for the past decade.
Michelle has been picked up as an expert writer for Informa publisher’s Clinical Trials community, as well as being listed as a blog source by the world’s leading medical journals, including the acclaimed Nature-Springer journal series.
Healthinnovations is currently indexed by the trusted Altmetric and PlumX metrics systems, respectively, as a blog source for published research globally. Healthinnovations is also featured in the world-renowned BioPortfolio, BioPortfolio.com, the life science, pharmaceutical and healthcare portal.
Most recently the Texas A&M University covered The Top 10 Healthinnovations series on their site with distinguished Professor Stephen Maren calling the inclusion of himself and his team on the list a reflection of “the hard work and dedication of my students and trainees”.
Michelle Petersen’s copy was used in the highly successful marketing campaign for the mega-hit film ‘Jumanji: The Next Level, starring Jack Black, Karen Gilian, Kevin Hart and Dwayne ‘The Rock’ Johnson. Michelle Petersen’s copywriting was part of the film’s coverage by the Republic TV network. Republic TV is the most-watched English language TV channel in India since its inception in 2017.
An avid campaigner in the fight against child sex abuse and trafficking, Michelle is a passionate humanist striving for a better quality of life for all humans by helping to provide traction for new technologies and techniques within healthcare.