Residues in the Hendra Virus Fusion Protein Transmembrane Domain Are Critical for Endocytic Recycling

  • Popa A
  • Carter J
  • Smith S
  • et al.
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Abstract

Hendra virus is a highly pathogenic paramyxovirus classified as a biosafety level four agent. The fusion (F) protein of Hendra virus is critical for promoting viral entry and cell-to-cell fusion. To be fusogenically active, Hendra virus F must undergo endocytic recycling and cleavage by the endosomal/lysosomal protease cathepsin L, but the route of Hendra virus F following internalization and the recycling signals involved are poorly understood. We examined the intracellular distribution of Hendra virus F following endocytosis and showed that it is primarily present in Rab5- and Rab4-positive endosomal compartments, suggesting that cathepsin L cleavage occurs in early endosomes. Hendra virus F transmembrane domain (TMD) residues S490 and Y498 were found to be important for correct Hendra virus F recycling, with the hydroxyl group of S490 and the aromatic ring of Y498 important for this process. In addition, changes in association of isolated Hendra virus F TMDs correlated with alterations to Hendra virus F recycling, suggesting that appropriate TMD interactions play an important role in endocytic trafficking.

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APA

Popa, A., Carter, J. R., Smith, S. E., Hellman, L., Fried, M. G., & Dutch, R. E. (2012). Residues in the Hendra Virus Fusion Protein Transmembrane Domain Are Critical for Endocytic Recycling. Journal of Virology, 86(6), 3014–3026. https://doi.org/10.1128/jvi.05826-11

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