6b1k | pdb_00006b1k
Macrophage Migration Inhibitory Factor in Complex with a Naphthyridinone Inhibitor (3a)
Structural highlights
Disease[MIF_HUMAN] Genetic variations in MIF are associated with susceptibility to rheumatoid arthritis systemic juvenile (RASJ) [MIM:604302]. An inflammatory articular disorder with systemic-onset beginning before the age of 16. It represents a subgroup of juvenile arthritis associated with severe extraarticular features and occasionally fatal complications. During active phases of the disorder, patients display a typical daily spiking fever, an evanescent macular rash, lymphadenopathy, hepatosplenomegaly, serositis, myalgia and arthritis. Function[MIF_HUMAN] Pro-inflammatory cytokine. Involved in the innate immune response to bacterial pathogens. The expression of MIF at sites of inflammation suggests a role as mediator in regulating the function of macrophages in host defense. Counteracts the anti-inflammatory activity of glucocorticoids. Has phenylpyruvate tautomerase and dopachrome tautomerase activity (in vitro), but the physiological substrate is not known. It is not clear whether the tautomerase activity has any physiological relevance, and whether it is important for cytokine activity.[1] [2] Publication Abstract from PubMedCoordination 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 A. 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 mug/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. Adding a Hydrogen Bond May Not Help: Naphthyridinone vs Quinoline Inhibitors of Macrophage Migration Inhibitory Factor.,Dawson TK, Dziedzic P, Robertson MJ, Cisneros JA, Krimmer SG, Newton AS, Tirado-Rives J, Jorgensen WL ACS Med Chem Lett. 2017 Nov 14;8(12):1287-1291. doi:, 10.1021/acsmedchemlett.7b00384. eCollection 2017 Dec 14. PMID:29259749[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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