Abstract
The gamma(1)34.5 protein, a virulence factor of herpes simplex viruses, redirects protein phosphatase 1 to dephosphorylate the alpha subunit of translation initiation factor 2 (eIF2alpha). Additionally, it inhibits the induction of antiviral genes by TANK-binding kinase 1. Nevertheless, its precise role in vivo remains to be established. Here we show that eIF2alpha dephosphorylation by gamma(1)34.5 is crucial for viral neuroinvasion. V(193)E and F(195)L substitutions in gamma(1)34.5 abrogate viral replication in the eye and spread to the trigeminal ganglia and brain. Intriguingly, inhibition of antiviral gene induction by gamma(1)34.5 is not sufficient to exhibit viral virulence.
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