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Structure of the parainfluenza virus 5 F protein in its metastable, prefusion conformation

Hsien-Sheng Yin1, Xiaolin Wen, Reay G Paterson

  • 1Howard Hughes Medical Institute, Northwestern University, Evanston, Illinois 60208-3500, USA.

Nature
|January 7, 2006
PubMed

Insights

The crystal structure of the parainfluenza virus 5 fusion (F) protein reveals significant conformational changes between its pre- and postfusion states. This finding clarifies the mechanism of viral membrane fusion and entry into host cells.

Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Enveloped viruses utilize complex glycoprotein machinery for cellular membrane fusion and entry.
  • The paramyxovirus fusion (F) protein is critical for mediating viral and cellular membrane merger.
  • The conformational changes of the F protein during fusion are not fully understood.

Purpose of the Study:

  • To determine the crystal structure of the parainfluenza virus 5 F protein in its prefusion conformation.
  • To elucidate the structural basis of F protein-mediated membrane fusion.

Main Methods:

  • Crystallization of the parainfluenza virus 5 F protein.
  • X-ray crystallography to determine the protein's 3D structure.
  • Analysis of structural differences between pre- and postfusion states.

Main Results:

  • The crystal structure of the parainfluenza virus 5 F protein in its prefusion state was determined.
  • Profound conformational differences exist between the prefusion and postfusion states of the F protein.
  • Key structural elements, including the fusion peptide and heptad repeat regions, undergo significant transitions.

Conclusions:

  • The determined structure provides insights into the F protein's mechanism of action.
  • Understanding these conformational changes is crucial for deciphering viral entry mechanisms.
  • This study clarifies the refolding process of the F protein during membrane fusion.

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