Dynamics and Interactions of a 29 kDa Human Enzyme Studied by Solid-State NMR

Area of Science:

• Biochemistry
• Structural Biology
• Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

• Solid-state NMR is valuable for characterizing biomacromolecules but limited by sensitivity and resolution, restricting studies to smaller units (<15 kDa).
• Enzymes, often larger and more complex, have been difficult to study using solid-state NMR despite the potential for valuable insights.

Purpose of the Study:

• To demonstrate the capability of solid-state NMR for comprehensive characterization of larger enzymes.
• To investigate the backbone dynamics and inhibitor interactions of a 29 kDa human carbonic anhydrase.

Main Methods:

• Utilized solid-state NMR spectroscopy.
• Assessed over 1200 backbone and side-chain chemical shifts.
• Studied a 29 kDa human carbonic anhydrase enzyme and its interaction with a small-molecule inhibitor.

Main Results:

• Reliably assigned over 1200 chemical shifts for a 29 kDa enzyme from minimal sample quantities.
• Gained access to backbone dynamics and intermolecular interactions with a small-molecule inhibitor.
• Demonstrated comprehensive enzyme assessment without molecular-tumbling limitations.

Conclusions:

• Solid-state NMR can now comprehensively characterize enzymes in the 29 kDa range and beyond.
• This advancement allows for detailed study of residue-specific properties crucial for enzyme function and drug development.
• Enables investigation of enzyme mechanisms and pharmacological interference for a wider range of enzymes.