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Abstract
TO subgroup strains of Theiler's murine encephalomyelitis virus (TMEV) synthesize L* protein from an alternative initiation codon. We first demonstrated L* expression in the central nervous system (CNS) of TMEV-infected mice during the acute phase of infection by immunoprecipitation and immunoblotting with anti-L* antibody. In addition, we generated mutant viruses which synthesize FLAG or 3xFLAG epitope-tagged L* protein. With a mutant virus expressing 3xFLAG epitope-tagged L*, designated DA/3xFLAGL*, we investigated L* in the CNS in the acute phase of infection. DA/3xFLAGL* did not change the virus tropism in comparison with wild-type virus, and L* was clearly identified in the CNS in both susceptible and resistant strains of mice. Double immunolabeling studies showed that L* is colocalized with TMEV polyprotein and exclusively expressed in neurons.
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