Publications, Science and Technology

Anti-Influenza A Virus Activities of Type I/III Interferons-Induced Mx1 GTPases from Different Mammalian Species

Ngày đăng: by Khoa Thú y

Abstract

Type I/III interferons provide powerful and universal innate intracellular defense mechanisms against viruses. Among the antiviral effectors induced, Mx proteins of some species appear as key components of defense against influenza A viruses. It is expected that such an antiviral protein must display a platform dedicated to the recognition of said viruses. In an attempt to identify such platform in human MxA, an evolution-guided approach capitalizing on the antagonistic arms race between MxA and its viral targets and the genomic signature it left on primate genomes revealed that the surface-exposed so-called “loop L4”, which protrudes from the compact structure of the MxA stalk, is a hotspot of recurrent positive selection. Since MxA is archetypic of Mx1 proteins in general, we reasoned that the L4 loop also functions as a recognition platform for influenza viruses in the Mx1 proteins of other species that had been exposed to the virus for ever. In this study, the anti-influenza activity of 5 distinct mammalian Mx1 proteins was measured by comparing the number of viral nucleoprotein-positive cells 7 h after infection in a sample of 100,000 cells expected to contain both Mx1-positive and Mx1-negative cell subpopulations. The systematic depletion (P < 0.001) of virus nucleoprotein-positive cells among equine, bubaline, porcine, and bovine Mx1-expressing cell populations compared with Mx-negative cells suggests a strong anti-influenza A activity. Looking for common anti-influenza signature elements in the sequence of these Mx proteins, we found that an aromatic residue at positions 561 or 562 in the L4 loop seems critical for the anti-influenza function and/or specificity of mammalian Mx1.
Keywords: Mx1; buffalo; cow; dog; horse; influenza; pig; type I/III interferons.

Phai Van Dam

FVM- Vietnam National University of Agriculture

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