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Herpes simplex virus L particles contain spherical membrane-enclosed inclusion vesicles
1MRC Virology Unit, University of Glasgow, U.K.
The Journal of General Virology
|July 1, 1994
Summary
Herpes simplex virus type 1 light particles are smaller than virions and contain unique inclusion vesicles. These vesicles, embedded in the tegument, are not found in infectious herpes simplex virus type 1 virions.
Area of Science:
- Virology
- Microscopy
Background:
- Herpes simplex virus type 1 (HSV-1) causes various human infections.
- Understanding HSV-1 particle structure is crucial for antiviral development.
Purpose of the Study:
- To elucidate the fine structure of HSV-1 light (L) particles.
- To compare L particles with infectious HSV-1 virions.
Main Methods:
- Cryo-electron microscopy was employed to examine HSV-1 L particles and virions.
- Detailed structural analysis focused on morphology, size, and component composition.
Main Results:
- L particles are smaller (140 nm) than virions (180 nm) and lack a nucleocapsid.
- L particles possess an envelope, tegument, and unique inclusion vesicles (IVs) within the tegument.
- IVs are membrane-bound spherical objects, distinct from the L particle envelope and tegument.
Conclusions:
- HSV-1 L particles represent a distinct structural entity compared to infectious virions.
- The presence of inclusion vesicles is a unique characteristic of HSV-1 L particles.
- Further research into IVs may reveal their role in HSV-1 biology or pathogenesis.