Adding a Hydrogen Bond May Not Help: Naphthyridinone vs Quinoline Inhibitors of Macrophage Migration Inhibitory Factor
- Yale Univ., New Haven, CT (United States)
Coordination of the ammonium group of Lys32 in the active site of human macrophage migration inhibitory factor (MIF) using a 1,7-naphthyridin-8-one instead of a quinoline is investigated. Both gas- and aqueous-phase DFT calculations for model systems indicate potential benefits for the added hydrogen bond with the lactam carbonyl group, while FEP results are neutral. Three crystal structures are reported for complexes of MIF with 3a, 4a, and 4b, which show that the desired hydrogen bond is formed with O–N distances of 2.8–3.0 Å. Compound 4b is the most potent new MIF inhibitor with Ki and Kd values of 90 and 94 nM; it also has excellent aqueous solubility, 288 μg/mL. Consistent with the FEP results, the naphthyridinones are found to have similar potency as related quinolines in spite of the additional protein–ligand hydrogen bond.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF); National Institutes of Health (NIH)
- Grant/Contract Number:
- AC02-06CH11357; GM32136; DGE-1122492; RR029205; GM103403
- OSTI ID:
- 1430309
- Journal Information:
- ACS Medicinal Chemistry Letters, Vol. 8, Issue 12; ISSN 1948-5875
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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