Residues in the hendra virus fusion protein transmembrane domain are critical for endocytic recycling

J Virol. 2012 Mar;86(6):3014-26. doi: 10.1128/JVI.05826-11. Epub 2012 Jan 11.

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.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Amino Acid Motifs
  • Amino Acid Sequence
  • Animals
  • Cell Line
  • Endocytosis*
  • Endosomes / metabolism
  • Hendra Virus / chemistry
  • Hendra Virus / genetics
  • Hendra Virus / metabolism*
  • Henipavirus Infections / physiopathology*
  • Henipavirus Infections / virology*
  • Humans
  • Molecular Sequence Data
  • Protein Structure, Tertiary
  • Protein Transport
  • Sequence Alignment
  • Viral Fusion Proteins / chemistry*
  • Viral Fusion Proteins / genetics
  • Viral Fusion Proteins / metabolism*

Substances

  • Viral Fusion Proteins