Related Experiment Videos
Release of coronavirus E protein in membrane vesicles from virus-infected cells and E protein-expressing cells
1Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712, USA.
Abstract:
Coronavirus E protein is a small viral envelope protein that plays an essential role in coronavirus assembly; coexpression of coronavirus M and E proteins results in the production of virus-like particles. The present study demonstrated that mouse hepatitis virus (MHV) E protein was released as an integral membrane protein in lipid vesicles from E-protein-expressing mammalian cells, in the absence of other MHV proteins. Furthermore, our data indicated that the E-protein-containing vesicles, which had a slightly lighter buoyant density than that of MHV, were released from MHV-infected cells. These data implied that E protein alone can drive the production and release of coronavirus envelope in the absence of M protein.
Insights
The coronavirus E protein drives viral envelope production and release. This integral membrane protein can form lipid vesicles independently, even without the M protein, simplifying coronavirus assembly.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- The coronavirus E protein is a critical component in viral assembly.
- Co-expression of M and E proteins leads to virus-like particle formation.
Purpose of the Study:
- To investigate the role and release mechanism of the mouse hepatitis virus (MHV) E protein.
- To determine if E protein can drive coronavirus envelope production independently.
Main Methods:
- Expressing MHV E protein in mammalian cells.
- Analyzing the release of E protein in lipid vesicles.
- Comparing the buoyant density of E-protein vesicles with MHV.
Main Results:
- MHV E protein was released as an integral membrane protein within lipid vesicles from E-protein-expressing cells.
- These E-protein-containing vesicles were released from MHV-infected cells.
- The vesicles showed a slightly lower buoyant density compared to intact MHV.
Conclusions:
- Coronavirus E protein alone can induce the production and release of viral envelopes.
- The M protein is not essential for E protein-driven envelope formation and release.