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Mutations in a highly conserved motif of nsp1β protein attenuate the innate immune suppression function of porcine reproductive and respiratory syndrome virus

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Title Mutations in a highly conserved motif of nsp1β protein attenuate the innate immune suppression function of porcine reproductive and respiratory syndrome virus
Not Available
 
Creator Li Y
Shyu DL
Shang P
Bai J
Ouyang K
Dhakal S
Hiremath J
Binjawadagi B
Renukaradhya GJ
Fang Y
 
Subject Mutations
highly conserved motif
nsp1β protein
Attenuate
innate immune suppression function
porcine reproductive and respiratory syndrome
virus
 
Description Not Available
Porcine reproductive and respiratory syndrome virus (PRRSV) nonstructural protein 1β (nsp1β) is a multifunctional viral protein, which is involved in suppressing the host innate immune response and activating a unique -2/-1 programmed ribosomal frameshifting (PRF) signal for the expression of frameshifting products. In this study, site-directed mutagenesis analysis showed that the R128A or R129A mutation introduced into a highly conserved motif ((123)GKYLQRRLQ(131)) reduced the ability of nsp1β to suppress interferon beta (IFN-β) activation and also impaired nsp1β's function as a PRF transactivator. Three recombinant viruses, vR128A, vR129A, and vRR129AA, carrying single or double mutations in the GKYLQRRLQ motif were characterized. In comparison to the wild-type (WT) virus, vR128A and vR129A showed slightly reduced growth abilities, while the vRR129AA mutant had a significantly reduced growth ability in infected cells. Consistent with the attenuated growth phenotype in vitro, pigs infected with nsp1β mutants had lower levels of viremia than did WT virus-infected pigs. Compared to the WT virus in infected cells, all three mutated viruses stimulated high levels of IFN-α expression and exhibited a reduced ability to suppress the mRNA expression of selected interferon-stimulated genes (ISGs). In pigs infected with nsp1β mutants, IFN-α production was increased in the lungs at early time points postinfection, which was correlated with increased innate NK cell function. Furthermore, the augmented innate response was consistent with the increased production of IFN-γ in pigs infected with mutated viruses. These data demonstrate that residues R128 and R129 are critical for nsp1β function and that modifying these key residues in the GKYLQRRLQ motif attenuates virus growth ability and improves the innate and adaptive immune responses in infected animals
Not Available
 
Date 2018-11-06T08:48:09Z
2018-11-06T08:48:09Z
2016-01-20
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/9569
 
Language English
 
Relation Not Available;
 
Publisher American Society for Microbiology