Construction of Recombinant Cell Lines for GPCR Expression.

Area of Science:

• Biochemistry
• Molecular Biology
• Structural Biology

Background:

• Large-scale recombinant protein expression is crucial for G protein-coupled receptor (GPCR) structure and function studies.
• Milligram quantities of pure GPCRs are often required for detailed analysis.
• Human embryonic kidney 293S (HEK293S) cells are a suitable host for recombinant protein production.

Purpose of the Study:

• To establish a procedure for inducible recombinant expression of bovine rhodopsin.
• To create stable human embryonic kidney 293S (HEK293S) cell lines for high-yield GPCR production.
• To facilitate structural and functional studies of GPCRs by providing a method for large-scale protein purification.

Main Methods:

• Construction of stable HEK293S cell lines for inducible expression of the bovine rhodopsin gene.
• Utilizing the HEK293S GnTI^- cell line for homogeneous glycoprotein modification.
• Optimization of transfection and protein expression protocols in HEK293S cells.

Main Results:

• Successful generation of stable HEK293S cell lines capable of inducible bovine rhodopsin expression.
• Demonstration of HEK293S cells' suitability for handling large protein cargo and performing necessary post-translational modifications.
• Production of pure bovine rhodopsin amenable to structural and functional investigations.

Conclusions:

• The described procedure enables efficient, large-scale recombinant expression of bovine rhodopsin using stable HEK293S cell lines.
• HEK293S cells, particularly the GnTI^- derivative, are advantageous hosts for producing complex membrane proteins like GPCRs.
• This method supports advanced structural and functional studies of GPCRs through reliable protein production.