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Membrane and inclusion body targeting of lyssavirus matrix proteins

Reiko Pollin1, Harald Granzow, Bernd Köllner

  • 1Institute of Molecular Biology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut, D-17493 Greifswald, Insel Riems, Germany.

Cellular Microbiology
|October 11, 2012
PubMed

Insights

Lyssavirus matrix proteins (M) from different bat viruses target distinct cellular membranes, influencing virus production. Nuclear and inclusion body localization suggests novel roles in host cell manipulation and viral RNA synthesis.

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Lyssavirus matrix proteins (M) are crucial for virus budding and host cell interactions.
  • Understanding M protein function is key to lyssavirus pathogenesis and host adaptation.

Purpose of the Study:

  • To investigate the differential membrane targeting of Rabies virus (RABV) and European Bat Lyssavirus Type 1 (EBLV-1) M proteins.
  • To explore potential novel functions of M proteins in the nucleus and inclusion bodies.

Main Methods:

  • Expression of authentic and chimeric M proteins from RABV and EBLV-1 in host cells.
  • Confocal microscopy to analyze M protein localization at cellular membranes, nucleus, and inclusion bodies.

Main Results:

  • EBLV-1 M protein preferentially accumulates at the Golgi apparatus, unlike RABV M protein.
  • Golgi association of EBLV-1 M is dependent on the integrity of the entire protein.
  • Both RABV and EBLV-1 M proteins were detected in the nucleus and Negri body-like inclusions for the first time.

Conclusions:

  • Differential membrane targeting of lyssavirus M proteins influences virus production sites.
  • Nuclear and inclusion body localization of M proteins suggests roles in host cell manipulation and viral RNA synthesis.
  • M protein localization is a key determinant of lyssavirus replication, host adaptation, and pathogenesis.

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