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The use of novel epitope-tagged arenaviruses reveals that Rab5c-positive endosomal membranes are targeted by the LCMV matrix protein.
Journal of General Virology 2018 Februrary
We report the development of recombinant New World (Junín; JUNV) and Old World (lymphocytic choriomeningitis virus; LCMV) mammarenaviruses that encode an HA-tagged matrix protein (Z). These viruses permit the robust affinity purification of Z from infected cells or virions, as well as the detection of Z by immunofluorescent microscopy. Importantly, the HA-tagged viruses grow with wild-type kinetics in a multi-cycle growth assay. Using these viruses, we report a novel description of JUNV Z localization in infected cells, as well as the first description of colocalization between LCMV Z and the GTPase Rab5c. This latter result, when combined with our previous findings that LCMV genome and glycoprotein also colocalize with Rab5c, suggest that LCMV may target Rab5c-positive membranes for preassembly of virus particles prior to budding. The recombinant viruses reported here will provide the field with new tools to better study Z protein functionality and identify key Z protein interactions with host machinery.
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