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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Microbiol
2017 ; 2
(ä): 17022
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Systems-based analysis of RIG-I-dependent signalling identifies KHSRP as an
inhibitor of RIG-I receptor activation
#MMPMID28248290
Soonthornvacharin S
; Rodriguez-Frandsen A
; Zhou Y
; Galvez F
; Huffmaster NJ
; Tripathi S
; Balasubramaniam VR
; Inoue A
; de Castro E
; Moulton H
; Stein DA
; Sánchez-Aparicio MT
; De Jesus PD
; Nguyen Q
; König R
; Krogan NJ
; García-Sastre A
; Yoh SM
; Chanda SK
Nat Microbiol
2017[Mar]; 2
(ä): 17022
PMID28248290
show ga
Retinoic acid-inducible gene I (RIG-I) receptor recognizes 5'-triphosphorylated
RNA and triggers a signalling cascade that results in the induction of type-I
interferon (IFN)-dependent responses. Its precise regulation represents a pivotal
balance between antiviral defences and autoimmunity. To elucidate the cellular
cofactors that regulate RIG-I signalling, we performed two global RNA
interference analyses to identify both positive and negative regulatory nodes
operating on the signalling pathway during virus infection. These factors were
integrated with experimentally and computationally derived interactome data to
build a RIG-I protein interaction network. Our analysis revealed diverse cellular
processes, including the unfolded protein response, Wnt signalling and RNA
metabolism, as critical cellular components governing innate responses to
non-self RNA species. Importantly, we identified K-Homology Splicing Regulatory
Protein (KHSRP) as a negative regulator of this pathway. We find that KHSRP
associates with the regulatory domain of RIG-I to maintain the receptor in an
inactive state and attenuate its sensing of viral RNA (vRNA). Consistent with
increased RIG-I antiviral signalling in the absence of KHSRP, viral replication
is reduced when KHSRP expression is knocked down both in vitro and in vivo. Taken
together, these data indicate that KHSRP functions as a checkpoint regulator of
the innate immune response to pathogen challenge.
|*Signal Transduction
[MESH]
|DEAD Box Protein 58/*antagonists & inhibitors
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Immunity, Innate
[MESH]
|Influenza A Virus, H1N1 Subtype/immunology
[MESH]