A thermostable, closed SARS-CoV-2 spike protein trimer.

Area of Science:

• Structural biology
• Virology
• Immunology

Background:

• The SARS-CoV-2 spike (S) protein is crucial for viral entry and a primary target for immune responses.
• S protein undergoes significant conformational changes, transitioning between closed and open states.
• Understanding these conformations is vital for developing vaccines and diagnostics.

Purpose of the Study:

• To design and produce stabilized SARS-CoV-2 S-protein trimers.
• To trap the S protein in a specific closed, prefusion conformation.
• To evaluate the utility of the stabilized S protein in serological assays.

Main Methods:

• Site-directed mutagenesis to introduce disulfide bonds for stabilization.
• Production and purification of engineered S-protein trimers.
• Structural analysis and functional characterization of the stabilized protein.

Main Results:

• Successfully designed and produced thermostable, disulfide-bonded S-protein trimers.
• Demonstrated that these trimers are locked in a closed, prefusion conformation.
• Confirmed the utility of the stabilized S trimer in serological assays.

Conclusions:

• Engineered stabilized S-protein trimers provide a locked, closed conformation.
• These stabilized trimers are valuable reagents for serological testing.
• The designed protein holds potential for broader applications in virology and immunology research.