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Nat Commun. 2014 Dec 9;5:5645. doi: 10.1038/ncomms6645.
Viral suppressors of the RIG-I-mediated interferon response are pre-packaged in influenza virions.
Liedmann S1, Hrincius ER2, Guy C3, Anhlan D1, Dierkes R1, Carter R4, Wu G4, Staeheli P5, Green DR3, Wolff T6, McCullers JA7, Ludwig S8, Ehrhardt C8.
Author information
Abstract
The type I interferon (IFN) response represents the first line of defence to invading pathogens. Internalized viral ribonucleoproteins (vRNPs) of negative-strand RNA viruses induce an early IFN response by interacting with retinoic acid inducible gene I (RIG-I) and its recruitment to mitochondria. Here we employ three-dimensional stochastic optical reconstruction microscopy (STORM) to visualize incoming influenza A virus (IAV) vRNPs as helical-like structures associated with mitochondria. Unexpectedly, an early IFN induction in response to vRNPs is not detected. A distinct amino-acid motif in the viral polymerases, PB1/PA, suppresses early IFN induction. Mutation of this motif leads to reduced pathogenicity in vivo, whereas restoration increases it. Evolutionary dynamics in these sequences suggest that completion of the motif, combined with viral reassortment can contribute to pandemic risks. In summary, inhibition of the immediate anti-viral response is 'pre-packaged' in IAV in the sequences of vRNP-associated polymerase proteins.
PMID:
25487526
[PubMed - in process]
Viral suppressors of the RIG-I-mediated interferon response are pre-packaged in influenza virions.
Liedmann S1, Hrincius ER2, Guy C3, Anhlan D1, Dierkes R1, Carter R4, Wu G4, Staeheli P5, Green DR3, Wolff T6, McCullers JA7, Ludwig S8, Ehrhardt C8.
Author information
Abstract
The type I interferon (IFN) response represents the first line of defence to invading pathogens. Internalized viral ribonucleoproteins (vRNPs) of negative-strand RNA viruses induce an early IFN response by interacting with retinoic acid inducible gene I (RIG-I) and its recruitment to mitochondria. Here we employ three-dimensional stochastic optical reconstruction microscopy (STORM) to visualize incoming influenza A virus (IAV) vRNPs as helical-like structures associated with mitochondria. Unexpectedly, an early IFN induction in response to vRNPs is not detected. A distinct amino-acid motif in the viral polymerases, PB1/PA, suppresses early IFN induction. Mutation of this motif leads to reduced pathogenicity in vivo, whereas restoration increases it. Evolutionary dynamics in these sequences suggest that completion of the motif, combined with viral reassortment can contribute to pandemic risks. In summary, inhibition of the immediate anti-viral response is 'pre-packaged' in IAV in the sequences of vRNP-associated polymerase proteins.
PMID:
25487526
[PubMed - in process]
