2. Signaling Pathways
  3. Metabolic Enzyme/Protease
  4. Indoleamine 2,3-Dioxygenase (IDO)

Indoleamine 2,3-Dioxygenase (IDO)

Indoleamine 2,3-Dioxygenase (IDO)

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Indoleamine 2, 3-dioxygenase (IDO) is an inflammatory cytokine-inducible rate-limiting enzyme of the tryptophan (Trp) catabolism, which is involved in the inhibition of intracellular pathogen replication as well as in immunomodulation. To date, three types of tryptophan-metabolizing enzymes have been identified: IDO1, IDO2 and tryptophan 2,3-dioxygenase 2.

IDO is an intracellular enzyme that is constitutively expressed in several human and mouse cells. Being present in innate immune cells, such as Mos and dendritic cells (DCs), IDO catalyzes the initial rate-limiting step of tryptophan (Trp) catabolism, thus leading to the production of immunoregulatory catabolites (collectively known as kynurenines).

The IDO gene promoter contains multiple sequence elements that confer responsiveness to proinflammatory mediators, thereby demonstrating the strong correlation between inflammation and induced IDO expression.

Indoleamine 2,3-Dioxygenase (IDO) Isoform Specific Products:

Indoleamine 2,3-Dioxygenase (IDO) Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-151108
    IDO1/TDO-IN-4
    		Inhibitor 99.23%
    IDO1/TDO-IN-4 is a potent IDO1/TDO dual inhibitor, with IC50 values of 3.53 μM (IDO1) and 1.15 μM (TDO). IDO1/TDO-IN-4 forms hydrogen bond with IDO1, and π−π stacking interaction with TDO. IDO1/TDO-IN-4 can be used in the research of depression, and depression-induced infectious, metabolic, and autoimmune disorders.
    IDO1/TDO-IN-4
  • HY-111540
    LY-3381916
    		Inhibitor 99.54%
    LY-3381916 (IDO1-IN-5) is a potent, selective and brain penetrated inhibitor of IDO1 activity, binds to apo-IDO1 lacking heme rather than mature heme-bound IDO1.
    LY-3381916
  • HY-131911
    PROTAC IDO1 Degrader-1
    		Inhibitor 98.17%
    PROTAC IDO1 Degrader-1 is the first potent IDO1 (indoleamine 2,3-dioxygenase 1) degrader that hijacks IDO1 to Cereblon E3 ligase to introduce IDO1 into UPS and eventually achieve ubiquitination and degradation (DC50=2.84 μM). PROTAC IDO1 Degrader-1 moderately improves the tumor-killing activity of H ER2 CAR-T cells.
    PROTAC IDO1 Degrader-1
  • HY-16987
    IDO-IN-3
    		Inhibitor 98.97%
    IDO-IN-3 is a potent indoleamine 2,3-dioxygenase (IDO) inhibitor with an IC50 of 290 nM.
    IDO-IN-3
  • HY-151093
    IDO2-IN-1
    		Inhibitor 98.86%
    IDO2-IN-1 is an orally active and potent Indoleamine 2,3-dioxygenase 2 (IDO2) inhibitor with an IC50 value of 112 nM. IDO2-IN-1 can be used for inflammatory autoimmunity research.
    IDO2-IN-1
  • HY-N0110B
    Palmatine hydroxide
    		Inhibitor 99.64%
    Palmatine hydroxide is an orally active and irreversible indoleamine 2,3-dioxygenase 1 (IDO-1) inhibitor with IC50s of 3 μM and 157μM against HEK 293-hIDO-1 and rhIDO-1, respectively. Palmatine hydroxide can also inhibit West Nile virus (WNV) NS2B-NS3 protease in an uncompetitive manner with an IC50 of 96 μM. Palmatine hydroxide shows anti-cancer, anti-oxidation, anti-inflammatory, neuroprotection, antibacterial, anti-viral activities.
    Palmatine hydroxide
  • HY-18769
    BMS-978587
    		Inhibitor 99.92%
    BMS-978587 (IDO-IN-4) is an indoleamine 2,3-dioxygenase 1 (IDO-1) inhibitor, extracted from patent WO2014150677A1, Compound example 1 enantiomer 1.
    BMS-978587
  • HY-153764
    IDO-IN-18
    		Inhibitor
    IDO-IN-18 (Compound 00815) is an IDO inhibitor. IDO-IN-18 can be used for research of immunosuppression associated infectious or cancer diseases.
    IDO-IN-18
  • HY-139205
    BMT-297376
    		Inhibitor
    BMT-297376, the optimized Linrodostat, is a potent IDO1 inhibitor.
    BMT-297376
  • HY-N0430A
    Coptisine Sulfate
    		Inhibitor 99.20%
    Coptisine Sulfate is an alkaloid from Chinese goldthread, and acts as an efficient uncompetitive IDO inhibitor with a Ki value of 5.8 μM and an IC50 value of 6.3 μM.
    Coptisine Sulfate
  • HY-79531
    IDO-IN-1
    		Inhibitor 98.13%
    IDO-IN-1 is a potent indoleamine 2,3-dioxygenase (IDO) inhibitor with an IC50 of 59 nM.
    IDO-IN-1
  • HY-111540B
    (S)-LY-3381916
    		Inhibitor 99.06%
    (S)-LY-3381916 ((S)-IDO1-IN-5; Example 1B) is an active S-isomer of LY-3381916. (S)-LY-3381916 binds to IDOL with an IC50 value less than 1.5 µΜ. LY-3381916 is a potent, selective and brain penetrated inhibitor of Indoleamine 2,3-Dioxygenase 1 (IDO1) activity, binds to apo-IDO1 lacking heme rather than mature heme-bound IDO1.
    (S)-LY-3381916
  • HY-128355
    IDO/TDO-IN-1
    		Inhibitor 99.22%
    IDO/TDO-IN-1 (compound 25) is a highly potent and orally active dual indoleamine-2,3-dioxygenase (IDO) and tryptophan 2,3-dioxygenase (TDO) inhibitor with IC50s of 9.7 and 47 nM, respectively .
    IDO/TDO-IN-1
  • HY-111540A
    (Rac)-LY-3381916
    		Inhibitor 99.12%
    (Rac)-LY-3381916 ((Rac)-IDO1-IN-5; Example 1) is a racemate of LY-3381916. LY-3381916 is a potent, selective and brain penetrated inhibitor of Indoleamine 2,3-Dioxygenase 1 (IDO1) activity, binds to apo-IDO1 lacking heme rather than mature heme-bound IDO1.
    (Rac)-LY-3381916
  • HY-18770
    IDO-IN-5
    		Inhibitor 99.90%
    IDO-IN-5 (NLG-1489) is an indoleamine 2,3-dioxygenase (IDO) inhibitor extracted from patent WO WO2012142237A1, compound 1489, has an IC50 of 1-10 μM.
    IDO-IN-5
  • HY-139204
    BMS-986242
    		Inhibitor 99.42%
    BMS-986242 is an orally active, potent and selective indoleamine-2,3-dioxygenase 1 (IDO1) inhibitor. BMS-986242 can be used for the research of cancer.
    BMS-986242
  • HY-115122
    IDO-IN-12
    		Inhibitor 99.22%
    IDO-IN-12 is an indoleamine 2,3-dioxygenase (IDO) inhibitor extracted from patent WO 2017181849 A1.
    IDO-IN-12
  • HY-112164B
    IACS-8968 S-enantiomer
    		Inhibitor 98.43%
    IACS-8968 (S-enantiomer) is the S-enantiomer of IACS-8968. IACS-8968 is a dual IDO and TDO inhibitor, with pIC50s of 6.43 for IDO and <5 for TDO, respectively.
    IACS-8968 S-enantiomer
  • HY-N2463
    Kushenol E
    		Inhibitor
    Kushenol E is a class of flavonoids isolated from Sophora flavescens and is a non-competitive indoleamine 2,3-dioxygenase 1 (IDO1) inhibitor with an IC50 of 7.7 µM and a Ki of 9.5 µM, has anti-tumor activity.
    Kushenol E
  • HY-N0430
    Coptisine
    		Inhibitor
    Coptisine is an alkaloid from Chinese goldthread, and acts as an efficient uncompetitive IDO inhibitor with a Ki value of 5.8 μM and an IC50 value of 6.3 μM.
    Coptisine
Cat. No. Product Name / Synonyms Species Source
Indoleamine 2,3-Dioxygenase (IDO) Isoform Comparison

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