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- W4387357679 abstract "ABSTRACT Myxovirus resistance proteins A and B (MxA and MxB) are interferon-induced proteins that exert antiviral activity against a diverse range of RNA and DNA viruses. In primates, MxA has been shown to inhibit myxoviruses, bunyaviruses, and the hepatitis B virus, whereas MxB restricts retroviruses and herpesviruses. As a result of their conflicts with viruses, both genes have been undergoing diversifying selection during primate evolution. Here, we investigate how MxB evolution in primates has affected its restriction of herpesviruses. In contrast to human MxB, we find that most primate orthologs, including the closely related chimpanzee MxB, do not inhibit herpes simplex virus (HSV-1) replication. However, all primate MxB orthologs tested restricted human cytomegalovirus. Through the generation of human and chimpanzee MxB chimeras, we show that a single residue, M83, is the key determinant of restriction of HSV-1 replication. Humans are the only primate species known to encode a methionine at this position, whereas most other primate species encode a lysine. Residue 83 is also the most polymorphic residue in MxB in human populations, with M83 being the most common variant. However, ~2.5% of human MxB alleles encode a threonine at this position, which does not restrict HSV-1. Thus, a single amino acid variant in MxB, which has recently risen to high frequency in humans, has endowed human MxB with HSV-1 antiviral activity. IMPORTANCE Herpesviruses present a major global disease burden. Understanding the host cell mechanisms that block viral infections, as well as how viruses can evolve to counteract these host defenses, is critically important for understanding viral disease pathogenesis. This study reveals that the major human variant of the antiviral protein myxovirus resistance protein B (MxB) inhibits the human pathogen herpes simplex virus (HSV-1), whereas a minor human variant and orthologous MxB genes from even closely related primates do not. Thus, in contrast to the many antagonistic virus-host interactions in which the virus is successful in thwarting the host’s defense systems, here the human gene appears to be at least temporarily winning at this interface of the primate-herpesvirus evolutionary arms race. Our findings further show that a polymorphism at amino acid 83 in a small fraction of the human population is sufficient to abrogate MxB’s ability to inhibit HSV-1, which could have important implications for human susceptibility to HSV-1 pathogenesis." @default.
- W4387357679 created "2023-10-06" @default.
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- W4387357679 date "2023-10-05" @default.
- W4387357679 modified "2023-10-06" @default.
- W4387357679 title "A single polymorphic residue in humans underlies species-specific restriction of HSV-1 by the antiviral protein MxB" @default.
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- W4387357679 doi "https://doi.org/10.1128/jvi.00830-23" @default.
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