Active-Site Targeting Paramagnetic Probe for Matrix Metalloproteinases.

Area of Science:

• Medicinal Chemistry
• Biophysical Chemistry
• Structural Biology

Background:

• Matrix metalloproteinases (MMPs) are implicated in various diseases, making them therapeutic targets.
• Lanthanide (Ln³⁺) complexes with chelators like DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) are valuable tools in structural biology.
• Developing inhibitors that bind effectively to MMPs while incorporating imaging or structural probes is crucial.

Purpose of the Study:

• To design and synthesize novel Ln³⁺-DOTA complexes of a sulfonamide-based MMP inhibitor.
• To investigate the impact of the Ln³⁺-DOTA moiety on the binding affinity of the inhibitor to MMPs.
• To utilize the paramagnetic properties of the Ln³⁺ complexes for structural studies of ligand-protein interactions.

Main Methods:

• Synthesis of lanthanide complexes with a DOTA-conjugated MMP inhibitor.
• Enzyme inhibition assays to assess binding affinity.
• Paramagnetic NMR spectroscopy to study ligand-protein interactions and structural restraints.

Main Results:

• Successful synthesis of Ln³⁺-DOTA complexes of the MMP inhibitor.
• The Ln³⁺-DOTA moiety did not compromise the tight binding of the sulfonamide scaffold to the MMP catalytic domain.
• Paramagnetic properties were effectively used to gain structural insights into ligand-protein interactions.

Conclusions:

• Ln³⁺-DOTA complexes of MMP inhibitors are viable for structural studies.
• The linker length influences the quality of paramagnetic restraints for structural determination.
• This approach offers a method to probe MMP inhibitor-protein interactions using paramagnetic probes.