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Antagonism of the phosphatase PP1 by the measles virus V protein is required for innate immune escape of MDA5.


ABSTRACT: The cytosolic sensor MDA5 is crucial for antiviral innate immune defense against various RNA viruses including measles virus; as such, many viruses have evolved strategies to antagonize the antiviral activity of MDA5. Here, we show that measles virus escapes MDA5 detection by targeting the phosphatases PP1? and PP1?, which regulate MDA5 activity by removing an inhibitory phosphorylation mark. The V proteins of measles virus and the related paramyxovirus Nipah virus interact with PP1?/?, preventing PP1-mediated dephosphorylation of MDA5 and thereby its activation. The PP1 interaction with the measles V protein is mediated by a conserved PP1-binding motif in the C-terminal region of the V protein. A recombinant measles virus expressing a mutant V protein deficient in PP1 binding is unable to antagonize MDA5 and is growth impaired due to its inability to suppress interferon induction. This identifies PP1 antagonism as a mechanism employed by paramyxoviruses for evading innate immune recognition.

SUBMITTER: Davis ME 

PROVIDER: S-EPMC4120867 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature

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Antagonism of the phosphatase PP1 by the measles virus V protein is required for innate immune escape of MDA5.

Davis Meredith E ME   Wang May K MK   Rennick Linda J LJ   Full Florian F   Gableske Sebastian S   Mesman Annelies W AW   Gringhuis Sonja I SI   Geijtenbeek Teunis B H TB   Duprex W Paul WP   Gack Michaela U MU  

Cell host & microbe 20140701 1


The cytosolic sensor MDA5 is crucial for antiviral innate immune defense against various RNA viruses including measles virus; as such, many viruses have evolved strategies to antagonize the antiviral activity of MDA5. Here, we show that measles virus escapes MDA5 detection by targeting the phosphatases PP1α and PP1γ, which regulate MDA5 activity by removing an inhibitory phosphorylation mark. The V proteins of measles virus and the related paramyxovirus Nipah virus interact with PP1α/γ, preventi  ...[more]

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