Antagonism of the phosphatase PP1 by the measles virus V protein is required for innate immune escape of MDA5.
Cell Host Microbe
; 16(1): 19-30, 2014 Jul 09.
Article
en En
| MEDLINE
| ID: mdl-25011105
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 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, 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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fosfoproteínas
/
Proteínas Virales
/
ARN Helicasas DEAD-box
/
Proteína Fosfatasa 1
/
Interacciones Huésped-Patógeno
/
Evasión Inmune
/
Virus del Sarampión
Límite:
Humans
Idioma:
En
Revista:
Cell Host Microbe
Asunto de la revista:
MICROBIOLOGIA
Año:
2014
Tipo del documento:
Article
País de afiliación:
Estados Unidos