A protocol to isolate, identify, and verify glucose- or carbohydrate-binding receptors

Area of Science:

• Biochemistry and Molecular Biology
• Metabolic Signaling Pathways
• Drug Discovery and Development

Background:

• Glucose sensing, transport, and utilization are crucial for animal energy homeostasis.
• While glucose transporters are known, glucose receptors mediating non-metabolic effects are largely unidentified.
• Identifying glucose receptors is key to understanding metabolic regulation and developing therapeutics for diabetes.

Purpose of the Study:

• To establish a sensitive and reproducible protocol for isolating and identifying glucose-binding receptors.
• To enable the study of glucose signaling pathways in various physiological and pathological conditions.
• To facilitate the development of novel therapeutic strategies for metabolic disorders.

Main Methods:

• Development of high molecular weight glucose-biotin-polyacrylamide (PAA) conjugates (30 kDa, 80:5:15% mole fractions).
• Utilized streptavidin-coated magnetic beads for immobilizing conjugates and enriching glucose-binding proteins from tissue homogenates or cell suspensions.
• Employed mass spectrometry/proteomics for protein identification, In-cell ELISA for interaction verification, and surface plasmon resonance (SPR) for binding kinetics analysis.

Main Results:

• Successfully isolated and identified candidate glucose-binding proteins using the developed protocol.
• Verified glucose-receptor interactions in-vitro using In-cell ELISA.
• Quantified binding kinetics between glucose and its potential receptor via SPR.

Conclusions:

• A novel protocol combining magnetic bead enrichment, mass spectrometry, In-cell ELISA, and SPR effectively isolates, identifies, and verifies glucose-binding receptors.
• This methodology provides a robust platform for future research into glucose and carbohydrate receptor signaling pathways.
• The findings are expected to advance the understanding of metabolic regulation and contribute to the development of treatments for diabetes and related diseases.