On-cell nuclear magnetic resonance spectroscopy to probe cell surface interactions

Area of Science:

• Biochemistry
• Biophysics
• Chemical Biology

Background:

• Nuclear magnetic resonance (NMR) spectroscopy is a powerful tool for atomic-level molecular analysis.
• NMR studies can be broadly categorized as "in-cell" (intracellular) or "on-cell" (cell surface).
• On-cell NMR offers a direct approach to study molecular interactions at the cell surface.

Purpose of the Study:

• To review key NMR techniques for on-cell studies.
• To survey applications of on-cell NMR for characterizing cell surface molecules.
• To highlight the utility of on-cell NMR for studying ligand interactions with membrane proteins.

Main Methods:

• Solution-state and solid-state NMR techniques are employed for on-cell studies.
• Focus on characterizing ligand interactions with cell surface membrane proteins, including G-protein coupled receptors (GPCRs) and receptor tyrosine kinases.
• Utilizes on-cell NMR to obtain physiologically relevant information directly.

Main Results:

• On-cell NMR enables quantification of binding affinities and competitive binding assays.
• Determination of ligand-bound state conformations and receptor dynamics is achievable.
• Provides distance constraints for ligand-receptor complexes.
• Avoids challenges associated with membrane protein production and purification.

Conclusions:

• On-cell NMR spectroscopy is a valuable technique for studying cell surface molecular interactions.
• It provides direct, physiologically relevant insights into ligand binding and receptor behavior.
• Applicable to various cell surface molecules beyond membrane proteins.