4K9G

1.55 A Crystal Structure of Macrophage Migration Inhibitory Factor bound to ISO-66 and a related compound

Summary for 4K9G

• Entry DOI: 10.2210/pdb4k9g/pdb
• Related: 1LJT
• Descriptor: Macrophage migration inhibitory factor, (4R,6Z)-6-(3-fluoro-4-hydroxyphenyl)-4-hydroxy-6-iminohexan-2-one, 1-[(5S)-3-(3-fluoro-4-hydroxyphenyl)-4,5-dihydro-1,2-oxazol-5-yl]propan-2-one, ... (6 entities in total)
• Functional Keywords: cytokine, secreted/endocytosed, isomerase
• Biological source: Homo sapiens (human)
• Cellular location: Secreted: P14174
• Total number of polymer chains: 3
• Total formula weight: 38328.91

Authors

Crichlow, G.V.,Al-Abed, Y.,Lolis, E.J. (deposition date: 2013-04-19, release date: 2014-09-24, Last modification date: 2023-09-20)

Primary citation

Ioannou, K.,Cheng, K.F.,Crichlow, G.V.,Birmpilis, A.I.,Lolis, E.J.,Tsitsilonis, O.E.,Al-Abed, Y.
ISO-66, a novel inhibitor of macrophage migration, shows efficacy in melanoma and colon cancer models.
INT J ONCOL., 45:1457-1468, 2014

PubMed Abstract: Macrophage migration inhibitory factor (MIF) is a pleiotropic pro-inflammatory cytokine, which possesses a contributing role in cancer progression and metastasis and, thus, is now considered a promising anticancer drug target. Many MIF-inactivating strategies have proven successful in delaying cancer growth. Here, we report on the synthesis of ISO-66, a novel, highly stable, small-molecule MIF inhibitor, an analog of ISO-1 with improved characteristics. The MIF:ISO-66 co-crystal structure demonstrated that ISO-66 ligates the tautomerase active site of MIF, which has previously been shown to play an important role in its biological functions. In vitro, ISO-66 enhanced specific and non-specific anticancer immune responses, whereas prolonged administration of ISO-66 in mice with established syngeneic melanoma or colon cancer was non-toxic and resulted in a significant decrease in tumor burden. Subsequent ex vivo analysis of mouse splenocytes revealed that the observed decrease in tumor growth rates was likely mediated by the selective in vivo expansion of antitumor-reactive effector cells induced by ISO-66. Compared to other MIF-inactivating strategies employed in vivo, the anticancer activity of ISO-66 is demonstrated to be of equal or better efficacy. Our findings suggest that targeting MIF, via highly specific and stable compounds, such as ISO-66, may be effective for cancer treatment and stimulation of anticancer immune responses.

PubMed: 25050663
DOI: 10.3892/ijo.2014.2551

Experimental method

X-RAY DIFFRACTION (1.55 Å)