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Optimization of Pyrazoles as Phenol Surrogates to Yield Potent Inhibitors of Macrophage Migration Inhibitory Factor
Vinay Trivedi-Parmar1, Michael J Robertson1, José A Cisneros1
1Department of Chemistry, Yale University, New Haven, CT, 06520-8107, USA.
Abstract:
Macrophage migration inhibitory factor (MIF) is a proinflammatory cytokine that is implicated in the regulation of inflammation, cell proliferation, and neurological disorders. MIF is also an enzyme that functions as a keto-enol tautomerase. Most potent MIF tautomerase inhibitors incorporate a phenol, which hydrogen bonds to Asn97 in the active site. Starting from a 113-μm docking hit, we report results of structure-based and computer-aided design that have provided substituted pyrazoles as phenol alternatives with potencies of 60-70 nm. Crystal structures of complexes of MIF with the pyrazoles highlight the contributions of hydrogen bonding with Lys32 and Asn97, and aryl-aryl interactions with Tyr36, Tyr95, and Phe113 to the binding.
Insights
Researchers developed novel pyrazole compounds as potent inhibitors of macrophage migration inhibitory factor (MIF), a key enzyme in inflammation and disease. These pyrazoles offer an alternative to phenol-based inhibitors, showing significant binding affinity.
Area of Science:
- Biochemistry
- Medicinal Chemistry
- Structural Biology
Background:
- Macrophage migration inhibitory factor (MIF) is a proinflammatory cytokine and enzyme implicated in inflammation, cell proliferation, and neurological disorders.
- Current potent inhibitors of MIF's tautomerase activity utilize a phenol moiety for active site binding.
Purpose of the Study:
- To design and synthesize novel MIF tautomerase inhibitors.
- To identify phenol alternatives with comparable or improved potency.
Main Methods:
- Structure-based drug design utilizing computational methods.
- Synthesis of substituted pyrazole compounds.
- Biochemical assays to determine inhibitor potency (IC50 values).
- X-ray crystallography to elucidate binding interactions.
Main Results:
- Identified substituted pyrazoles as effective MIF tautomerase inhibitors with potencies in the 60-70 nM range.
- Crystal structures revealed key binding interactions, including hydrogen bonds with Lys32 and Asn97, and aryl-aryl interactions with Tyr36, Tyr95, and Phe113.
- Demonstrated pyrazoles as viable alternatives to phenol-based MIF inhibitors.
Conclusions:
- Novel pyrazole-based inhibitors offer a promising new class of compounds targeting MIF.
- Structure-activity relationship insights guide further optimization of MIF inhibitors.
- These findings contribute to the development of therapeutics for inflammatory and neurological conditions.
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