Article (Scientific journals)
Influenza virus protein PB1-F2 interacts with CALCOCO2 (NDP52) to modulate innate immune response
Leymarie, Olivier; Meyer, Lea; Tafforeau, Lionel et al.
2017In Journal of General Virology
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Abstract :
[en] PB1-F2 is a viral protein encoded by influenza A viruses (IAVs). PB1-F2 is implicated in virulence by triggering immune cell apoptosis and enhancing inflammation. To obtain an insight into the molecular mechanisms of PB1-F2-mediated virulence, we used the yeast two-hybrid approach to find new PB1-F2 cellular interactors. This allowed us to identify calcium-binding and coiled-coil domain 2 (CALCOCO2, also known as NDP52) as a binding partner of PB1-F2. Binding of PB1-F2 to CALCOCO2 was confirmed by pull-down. Surface plasmon resonance binding experiments enabled us to estimate the dissociation constant (Kd) of the two partners to be around 20nM. Using bioinformatics tools, we designed a CALCOCO2 interaction map based on previous knowledge and showed a strong connection between this protein and the type I interferon production pathways and the I-κB kinase/NF-κB signalling pathway. NF-κB reporter assays in which CALCOCO2, MAVS and PB1-F2 were co-expressed showed a cooperation of these three proteins to increase the inflammatory response. By contrast, PB1-F2 inhibits the TBK1-dependent activation of an ISRE reporter plasmid. We also demonstrated that the signal transducer TRAF6 is implicated in the enhancement of NF-κB activity mediated by PB1-F2/CALCOCO2 binding. Altogether, this report provides evidence of an interaction link between PB1-F2 and human proteins, and allows a better understanding of the involvement of PB1-F2 in the pathologic process mediated by IAV.
Disciplines :
Biochemistry, biophysics & molecular biology
Immunology & infectious disease
Author, co-author :
Leymarie, Olivier
Meyer, Lea
Tafforeau, Lionel  ;  Université de Mons > Faculté des Sciences > Biologie cellulaire
Lotteau, Vincent
Da Costa, Bruno
Delmas, Bernard
Chevalier, Christophe
Le Goffic, Ronan
Language :
English
Title :
Influenza virus protein PB1-F2 interacts with CALCOCO2 (NDP52) to modulate innate immune response
Publication date :
14 June 2017
Journal title :
Journal of General Virology
ISSN :
0022-1317
Publisher :
Society for General Microbiology, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S815 - Biologie cellulaire
Research institute :
R550 - Institut des Sciences et Technologies de la Santé
R100 - Institut des Biosciences
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