Identification of amino acid residues critical for the anti-interferon activity of the nucleoprotein of the prototypic arenavirus lymphocytic choriomeningitis virus.

Martinez-Sobrido, Luis, Sébastien Emonet, Panagiotis Giannakas, Beatrice Cubitt, Adolfo García-Sastre, and Juan C de la Torre. 2009. “Identification of Amino Acid Residues Critical for the Anti-Interferon Activity of the Nucleoprotein of the Prototypic Arenavirus Lymphocytic Choriomeningitis Virus.”. Journal of Virology 83 (21): 11330-40.

Abstract

Lymphocytic choriomeningitis virus (LCVM) nucleoprotein (NP) counteracts the host type I interferon (IFN) response by inhibiting activation of the IFN regulatory factor 3 (IRF3). In this study, we have mapped the regions and specific amino acid residues within NP involved in its anti-IFN activity. We identified a region spanning residues 382 to 386 as playing a critical role in the IFN-counteracting activity of NP. Alanine substitutions at several positions within this region resulted in NP mutants that lacked the IFN-counteracting activity but retained their functions in virus RNA synthesis and assembly of infectious particles. We used reverse genetics to rescue a recombinant LCMV strain carrying mutation D382A in its NP [rLCMV/NP*(D382A)]. Compared to wild-type (WT) LCMV, rLCMV/NP*(D382A) exhibited a higher level of attenuation in IFN-competent than IFN-deficient cells. In addition, A549 cells infected with rLCMV/NP*(D382A), but not with WT LCMV, produced IFN and failed to rescue replication of the IFN-sensitive Newcastle disease virus.

Last updated on 12/12/2023
PubMed