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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2018 ; 115 (13): 3249-54 Nephropedia Template TP
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Immune-modulating enzyme indoleamine 2,3-dioxygenase is effectively inhibited by targeting its apo-form #MMPMID29531094
Nelp MT; Kates PA; Hunt JT; Newitt JA; Balog A; Maley D; Zhu X; Abell L; Allentoff A; Borzilleri R; Lewis HA; Lin Z; Seitz SP; Yan C; Groves JT
Proc Natl Acad Sci U S A 2018[Mar]; 115 (13): 3249-54 PMID29531094show ga
Indoleamine 2,3-dioxygenase (IDO1) is a heme protein that catalyzes the dioxygenation of tryptophan. Cells expressing this activity are able to profoundly alter their surrounding environment to suppress the immune response. Cancer cells exploit this pathway to avoid immune-mediated destruction. Through a range of kinetic, structural, and cellular assays, we show that two classes of highly selective inhibitors of IDO1 act by competing with heme binding to apo-IDO1. This shows that IDO1 is dynamically bound to its heme cofactor in what is likely a critical step in the regulation of this enzyme. These results have elucidated a previously undiscovered role for the ubiquitous heme cofactor in immune regulation, and it suggests that other heme proteins in biology may be similarly regulated.