Human indoleamine 2,3-dioxygenase-2 has substrate specificity and inhibition characteristics distinct from those of indoleamine 2,3-dioxygenase-1.

Indoleamine 2,3-dioxygenase-2 (IDO2) is one of three enzymes (alongside tryptophan 2,3-dioxygenase and indoleamine 2,3-dioxygenase (IDO1)) that catalyse dioxygenation of L-tryptophan as the first step in the kynurenine pathway. Despite the reported expression of IDO2 in tumours, some fundamental characteristics of the enzyme, such as substrate specificity and inhibition selectivity, are still to be clearly defined. In this study, we report the kinetic and inhibition characteristics of recombinant human IDO2.