Open AccessNFAR-1 and -2 modulate translation and are required for efficient host defense
Author(s) -
I Pfeifer,
Rachel Elsby,
Marilyn Fernandez,
Paula A. Faria,
Daniel R. Nussenzveig,
Izidor S. Lossos,
Beatriz M. A. Fontoura,
William Martin,
Glen N. Barber
Publication year - 2008
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.0711222105
Subject(s) - microbiology and biotechnology , biology , translation (biology) , messenger rna , ribonucleoprotein , nuclear export signal , vesicular stomatitis virus , rna , cytoplasm , innate immune system , protein biosynthesis , virus , cell nucleus , virology , genetics , immune system , gene
We report here that the alternatively spliced nuclear factors associated with double-stranded RNA, NFAR-1 (90 kDa) and -2 (110 kDa), are involved in retaining cellular transcripts in intranuclear foci and can regulate the export of mRNA to the cytoplasm. Furthermore, the NFAR proteins were found to remain associated with exported ribonucleoprotein complexes. Loss of NFAR function, which was embryonic-lethal, caused an increase in protein synthesis rates, an effect augmented by the presence of the mRNA export factors TAP, p15, or Rae1. Significantly, NFAR depletion in normal murine fibroblasts rendered these cells dramatically susceptible to vesicular stomatitis virus replication. Collectively, our data demonstrate that the NFARs exert influence on mRNA trafficking and the modulation of translation rates and may constitute an innate immune translational surveillance mechanism important in host defense countermeasures against virus infection.