Purification of insulin receptor with full binding activity

Area of Science:

• Biochemistry
• Molecular Biology
• Endocrinology

Background:

• The insulin receptor is crucial for glucose homeostasis and metabolic regulation.
• Previous purification methods often resulted in receptor instability and loss of binding activity.

Purpose of the Study:

• To develop a more efficient and effective method for purifying the human insulin receptor.
• To preserve the insulin-binding activity and stability of the purified receptor.

Main Methods:

• Affinity chromatography using wheat germ agglutinin-Sepharose and insulin-Sepharose.
• Mild elution conditions eliminating urea to maintain receptor integrity.
• Chromatofocusing, gel filtration, and SDS-PAGE for purity and molecular weight analysis.

Main Results:

• Achieved a 2400-fold purification of the insulin receptor with a 40% overall yield.
• The novel elution method resulted in a 4-to 5-fold increase in specific activity compared to urea-based elution.
• Purified receptor preparation demonstrated stability and full insulin-binding activity.

Conclusions:

• Mild elution conditions are critical for preserving insulin receptor function after purification.
• This optimized purification strategy provides a highly active and stable insulin receptor for further studies.
• The findings have implications for understanding insulin signaling pathways and developing related therapeutics.