High Resolution ³¹P Field Cycling NMR Reveals Unsuspected Features of Enzyme-Substrate-Cofactor Dynamics.

Area of Science:

• Biochemistry
• Chemical Physics
• Structural Biology

Background:

• Enzyme-substrate dynamics are crucial for catalysis, but studying protein-bound ligands remains challenging.
• Existing structural methods often lack the resolution to capture dynamic interactions.
• Understanding ligand dynamics is key to elucidating enzyme mechanisms.

Purpose of the Study:

• To apply field cycling NMR relaxometry to investigate the dynamics of enzyme-bound substrates and cofactors.
• To explore catalytically competent complexes of GMP reductase.
• To reveal novel binding modes and dynamic networks involved in enzymatic catalysis.

Main Methods:

• Utilized field cycling NMR relaxometry.
• Investigated dynamics of enzyme-bound substrates and cofactors in GMP reductase.
• Analyzed catalytically competent enzyme-ligand complexes.

Main Results:

• Measured dynamics of enzyme-bound substrates and cofactors in GMP reductase.
• Identified novel binding modes not evident from X-ray crystallography.
• Discovered reaction-specific dynamic networks.
• Demonstrated the catalytic importance of distal interactions.

Conclusions:

• Field cycling NMR relaxometry is a powerful tool for probing protein-ligand dynamics.
• Distal interactions play an active role in enzyme catalysis, expanding our understanding of reaction coordinates.
• Advancements in technology will increase accessibility and applications of this technique.