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Virus Res. 2009 Jun;142(1-2):200-3. doi: 10.1016/j.virusres.2008.12.017. Epub 2009 Jan 29.

Parainfluenza virus type 5 (PIV-5) morphology revealed by cryo-electron microscopy.

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Université de Lyon, F-69000 Lyon, France.


The knowledge of parainfluenza type 5 (PIV-5) virion morphology is essentially based on the observation of negatively stained preparations in conventional transmission electron microscopy (CTEM). In this study, the ultrastructure of frozen-hydrated intact PIV-5 was examined by cryo-electron microscopy (cryo-EM). Cryo-EM revealed a majority of spherical virions (70%), with a lower pleiomorphy than originally observed in CTEM. Phospholipid bilayer thickness, spike length and glycoprotein spikes density were measured. About 2000 glycoprotein spikes were present in an average-sized spherical virion. Altogether, these data depict a more precise view of PIV-5 morphology.

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