Substrate specificity for isomerase activity of macrophage migration inhibitory factor and its inhibition by indole derivatives

Journal of Biochemistry
M SuzukiJ Nishihira

Abstract

Macrophage migration inhibitory factor (MIF) was discovered as a cytokine that inhibits random migration of macrophages and concentrates them at inflammatory loci. We recently reported the tertiary structure of MIF, and revealed its similarity to that of 5-carboxymethyl-2-hydroxymuconate isomerase. Moreover, MIF was found to have isomerase activity converting D-dopachrome, a stereoisomer of naturally-occurring L-dopachrome, to 5,6-dihydroxyindole-2-carboxylic acid. In this study, we examined the effects of a series of compounds analogous to D-dopachrome on the enzyme activity to obtain vital information for identification of a natural substrate of MIF. Adrenochrome, lacking a carboxyl group at position 2 of the indolinequinone ring, could not be a substrate. Several indole-ring-containing compounds with a carboxyl group were inhibitory to D-dopachrome isomerase activity, of which indole-3-acrylic acid was the most potent inhibitor, with an inhibitor constant (Ki) of 2.8 mM. 2,3-Indolinedione, which lacks a complete indole ring or a carboxyl group but has carbonyl groups at positions 2 and 3, apparently inhibited the enzyme activity in a competitive or mixed manner with a Ki of 0.9 mM. Taken together, these facts suggest that th...Continue Reading

Citations

Nov 27, 1999·Bioorganic & Medicinal Chemistry Letters·X Zhang, R Bucala
Jan 5, 2002·Proceedings of the National Academy of Sciences of the United States of America·Peter D SenterRichard Bucala
Apr 2, 2003·Expert Opinion on Therapeutic Targets·Elias Lolis, Richard Bucala
Jan 28, 1999·The Journal of Biological Chemistry·J MatsunagaV J Hearing
May 31, 2018·Journal of Medicinal Chemistry·Vinay Trivedi-Parmar, William L Jorgensen

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