Functional Trimeric SARS-CoV-2 Envelope Protein Expressed in Stable CHO Cells

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes the COVID-19 pandemic.
• The SARS-CoV-2 spike (S) protein mediates viral entry by binding to the ACE2 receptor.
• Existing methods for obtaining recombinant S-protein are limited, hindering research.

Purpose of the Study:

• To develop a robust protocol for recombinant expression and purification of the SARS-CoV-2 spike protein.
• To enable further studies on virus-host interactions and therapeutic development.
• To generate high-quality, full-length or trimeric spike protein variants.

Main Methods:

• Development of a recombinant Chinese Hamster Ovary (CHO) cell line.
• Stable expression of the extracellular domain of a trimeric SARS-CoV-2 spike protein variant.
• Optimization of expression and purification parameters.

Main Results:

• Successfully established a stable CHO cell line for expressing the SARS-CoV-2 spike protein.
• Identified key parameters for efficient recombinant protein production.
• Generated a trimeric variant of the spike protein's extracellular domain.

Conclusions:

• The developed protocol facilitates the production of high-quality recombinant SARS-CoV-2 spike protein.
• This resource is vital for advancing research into viral mechanisms and therapeutic strategies.
• Further studies using mutant variants can illuminate virus assembly and drug development.