L-tryptophan(L-Trp)isanessentialaminoacidnecessaryforproteinsynthesisinmammaliancellsandtheL-Trptokynurenine(Kyn)pathwayisfirmlyestablishedasakeyregulatorofinnateandadaptiveimmunity.CatabolismofL-TrptoKynmaintainsanimmunosuppressivemicroenvironmentbystarvingimmunecellsofL-TrpandreleasingdegradationproductsofL-Trpthathaveimmunosuppressivefunctions.Indoleamine2,3-dioxygenases(IDO1&IDO2),twooftheratelimitingenzymesinthispathway,areupregulatedinmanytumors,providingcancercellswithanavenueforimmuneevasion.
TheIDO2InhibitorScreeningAssayKitisdesignedtomeasureIDO2enzymeinhibition.TheIDO2InhibitorScreeningAssayKitissimpletouse.InhibitorandenzymeareaddedtoasamplecontainingL-Trpsubstrate.
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