Expression and characterization of recombinant beta-subunit hCG homodimer

Area of Science:

• Biochemistry
• Molecular Biology
• Endocrinology

Background:

• Human chorionic gonadotropin (hCG) is a crucial hormone involved in pregnancy.
• Understanding hCG structure-function relationships is vital for reproductive biology and diagnostics.
• The alpha and beta subunits of hCG are essential for its biological activity.

Purpose of the Study:

• To engineer a functional beta-hCG homodimer protein.
• To investigate the structural and functional properties of the beta-hCG homodimer.
• To assess the potential of the homodimer to form a biologically active hCG dimer.

Main Methods:

• Tandem linkage of two human chorionic gonadotropin (hCG) beta-subunit cDNAs.
• Expression and secretion of the fusion protein in Chinese hamster ovary (CHO) cells.
• Analysis of protein conformation, subunit recombination, and receptor binding/activation.

Main Results:

• A fusion protein consisting of two mature beta-subunits was successfully expressed.
• The beta-hCG homodimer demonstrated native-like folding and stability.
• The homodimer recombined with alpha-subunits to form a stable, active hCG dimer, comparable to native hCG.

Conclusions:

• Engineered beta-hCG homodimers can be produced and exhibit native-like properties.
• The fusion protein facilitates the formation of a functional hCG dimer with significant biological activity.
• This engineered hCG dimer holds potential for applications in diagnostics and therapeutics.