Purification and Characterization of MxB

Area of Science:

• Virology
• Molecular Biology
• Protein Biochemistry

Background:

• MxB (myxovirus resistance protein B), also known as Mx2, is an interferon-induced GTPase crucial for restricting viral infections.
• The protein's intrinsically disordered N-terminal region and self-oligomerization properties have hindered previous purification efforts using standard bacterial expression systems.

Purpose of the Study:

• To establish a reliable method for expressing and purifying full-length wild-type MxB protein.
• To enable detailed characterization of MxB's GTPase activity and oligomerization functions.

Main Methods:

• Utilized suspension-adapted mammalian cells for protein expression.
• Developed a specific purification protocol for full-length MxB.
• Established assays to measure GTPase activity.
• Developed methods to analyze protein oligomerization.

Main Results:

• Successfully purified full-length wild-type MxB protein to homogeneity.
• Characterized the GTPase activity of the purified MxB protein.
• Demonstrated the oligomerization properties of MxB in vitro.

Conclusions:

• The described expression and purification procedure overcomes previous limitations, providing pure MxB for functional studies.
• This methodology facilitates in-depth investigation of MxB's antiviral mechanisms at a molecular level.