Robert Feulgen Lecture. Microscopic assessment of membrane protein structure and function

Area of Science:

• Biochemistry
• Structural Biology
• Biophysics

Background:

• Membrane proteins are vital, encoded by ~40% of genes, yet their structural data is limited compared to soluble proteins.
• Current structural information primarily comes from bacterial membrane proteins via X-ray crystallography.
• Determining membrane protein structures is challenging due to their hydrophobic nature and integration within lipid bilayers.

Discussion:

• Cryo-electron microscopy (cryo-EM) achieves atomic resolution by crystallizing membrane proteins in 2D arrays, overcoming low signal-to-noise ratios.
• Atomic force microscopy (AFM) offers subnanometer resolution imaging of individual membrane protein surfaces, enabling conformational state analysis.
• Electron crystallography provides accurate structural data for membrane proteins within their native-like lipid environments.

Key Insights:

• Advanced microscopy techniques are revolutionizing membrane protein structure determination.
• Studying membrane proteins in a functional state within lipid bilayers is now feasible.
• AFM and electron crystallography are emerging as powerful tools for high-resolution membrane protein imaging.

Outlook:

• Further advancements in cryo-EM and AFM will continue to expand the structural database of membrane proteins.
• These techniques will facilitate a deeper understanding of membrane protein function and dysfunction in disease.
• Integration of multiple imaging modalities promises comprehensive structural and dynamic insights.