This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: The Ebola virus can cause severe, often life-threatening disease in humans. To replicate, it must enter human cells and exploit their cellular processes.
In doing so, it encounters natural defense mechanisms that can make infection more difficult. A research team led by professor Michael Schindler from the Institute of Medical Virology and Epidemiology of Viral Diseases at Tübingen University Hospital, working with researchers from the Friedrich Loeffler Institute and the Bernhard Nocht Institute for Tropical Medicine, has investigated one such protective mechanism: the cellular protein CD81, which can inhibit certain stages of Ebola virus infection. At the same time, the virus uses two of its own proteins to counteract CD81.
The findings, published in The EMBO Journal, could open up new avenues for combating Ebola virus infections in the long term. The researchers set out to investigate how the Ebola virus alters the surface of human cells. They analyzed 332 cell surface proteins and identified CD81 as one of the proteins of particular interest.
CD81 belongs to a family of proteins known as tetraspanins, which are involved in various processes at the cell membrane. Further experiments showed that CD81 can interfere with Ebola virus replication. To investigate this, the research team used virus-like particles that mimic key stages of Ebola virus infection.
When CD81 was absent from the cells studied, certain steps of viral replication were enhanced. Conversely, increasing the amount of CD81 inhibited these processes. CD81 also restricted the entry of virus-like particles into cells.
The study also reveals how the Ebola virus interferes with this cellular defense mechanism. Both the viral surface glycoprotein GP and the matrix protein VP40 reduce the amount of CD81 in the cells studied and on their surface. "What we found particularly exciting was that not just one, but two viral proteins act against CD81, even though the Ebola virus only has in total seven proteins.
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