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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+Commun
2016 ; 7
(ä): 12754
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Influenza B virus non-structural protein 1 counteracts ISG15 antiviral activity
by sequestering ISGylated viral proteins
#MMPMID27587337
Zhao C
; Sridharan H
; Chen R
; Baker DP
; Wang S
; Krug RM
Nat Commun
2016[Sep]; 7
(ä): 12754
PMID27587337
show ga
The ubiquitin-like protein ISG15 and its conjugation to proteins (ISGylation) are
strongly induced by type I interferon. Influenza B virus encodes non-structural
protein 1 (NS1B) that binds human ISG15 and provides an appropriate model for
determining how ISGylation affects virus replication in human cells. Here using a
recombinant virus encoding a NS1B protein defective in ISG15 binding, we show
that NS1B counteracts ISGylation-mediated antiviral activity by binding and
sequestering ISGylated viral proteins, primarily ISGylated viral nucleoprotein
(NP), in infected cells. ISGylated NP that is not sequestered by mutant NS1B acts
as a dominant-negative inhibitor of oligomerization of the more abundant
unconjugated NP. Consequently formation of viral ribonucleoproteins that catalyse
viral RNA synthesis is inhibited, causing decreased viral protein synthesis and
virus replication. We verify that ISGylated NP is largely responsible for
inhibition of viral RNA synthesis by generating recombinant viruses that lack
known ISGylation sites in NP.