Indoleamine 2, 3-dioxygenase (IDO) is an intracellular enzyme that catalyzes the transformation of L-tryptophan to N-formylkynurenine, which is the first and rate-controlling step in the kynurenine pathway. IDO is a rate-limiting enzyme that catalyzes the degradation of tryptophan into kynurenine and is recognized to exert a tolerizing effect on T cells that require tryptophan to proliferate5. IDO also plays an important role in the activation and regulation of functionally quiescent regulatory T cells. IDO is a heme-containing enzyme that catalyzes the oxidative cleavage of 2,3 double bond of indole ring. IDO has the ability to inhibit T-cell activation by tryptophan starvation, whereas T-cell survival and proliferation are regulated by O2 free radicals and kynurenine derivatives. IDO plays a crucial role in autoimmunity,infections and malignancies. Indoleamine-2,3-dioxygenase (IDO) one of the most important immunoregulator enzyme responsible for metabolism of tryptophan as part of Kynurenin pathway. Tryptophan is catabolized in the tumor tissue by the rate-limiting enzyme IDO expressed in tumor cells or antigen presenting cells.


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IDO-IN-12

IDO-IN-12 is an indoleamine 2,3-dioxygenase (IDO) inhibitor extracted from patent WO 2017181849 A1.

  • CAS Number: 1888341-29-4
  • MF: C13H11BrFN5O3S
  • MW: 416.23
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1-IN-16

IDO1-IN-16 (I-1) is an IDO1 inhibitor targeting holo-IDO1, with an IC50 of 127 nM[1].

  • CAS Number: 2677054-63-4
  • MF: C25H35BrFN5O2
  • MW: 536.48
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1-IN-11

IDO1-IN-11 is an IDO1 inhibitor with an IC50 value of 0.6 nM.

  • CAS Number: 2306411-34-5
  • MF: C22H17ClFN3O3
  • MW: 425.84
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1/TDO-IN-4

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[1].

  • CAS Number: 461424-21-5
  • MF: C14H10N4
  • MW: 234.26
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Imsamotide

Imsamotide (IDO194-214) is a Indoleamine 2,3-Dioxygenase (IDO) peptide with sequences of DTLLKALLEIASCLEKALQVF, the IDO194-214. Imsamotide is also an immunological agent for active immunization, as well as an antineoplastic agent[1][2].

  • CAS Number: 2130836-27-8
  • MF: C106H180N24O31S
  • MW: 2318.76
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

NLG802

NLG802 is a prodrug of indoximod, an orally active indoleamine 2,3-dioxygenase (IDO) inhibitor.

  • CAS Number: 2071683-99-1
  • MF: C20H30ClN3O3
  • MW: 395.92
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1/2-IN-1 hydrochloride

IDO1/2-IN-1 hydrochloride (compound 4t) is the first potent IDO1/IDO2 dual inhibitor with IC50s of 28 nM and 144 nM for IDO1 and IDO2, respectively. IDO1/2-IN-1 hydrochloride exhibits antitumor activies. Orally active[1].

  • CAS Number: 2310286-60-1
  • MF: C16H19BrClFN8O4
  • MW: 521.73
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

INCB024360 analogue

IDO5L is a potent indoleamine 2,3-dioxygenase (IDO) inhibitor with an IC50 of 67 nM.

  • CAS Number: 914471-09-3
  • MF: C9H7ClFN5O2
  • MW: 271.636
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: 1.8±0.1 g/cm3
  • Boiling Point: 504.7±60.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 259.0±32.9 °C

IACS-8968

IACS-8968 is a dual IDO and TDO inhibitor, with pIC50s of 6.43 for IDO and <5 for TDO, respectively.

  • CAS Number: 2144425-14-7
  • MF: C17H18F3N5O2
  • MW: 381.35
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO-IN-2

IDO-IN-2 is an IDO inhibitor extracted from patent WO/2015031295 A1, compound example 1, has IC50 values of 0.068 μM in HeLa cell and 0.16 μM in HEK293 cell.

  • CAS Number: 1668565-74-9
  • MF: C29H35N7O
  • MW: 497.63
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Lacto-N-fucopentaose III

Lacto-N-fucopentaose III (LNFP-III) is an immune modulator. Lacto-N-fucopentaose III reduces the severity of experimental autoimmune encephalomyelitis (EAE) and CNS inflammation[1].

  • CAS Number: 25541-09-7
  • MF: C32H55NO25
  • MW: 853.77
  • Catalog: Aldehyde Dehydrogenase (ALDH)
  • Density: 1.71g/cm3
  • Boiling Point: 1264.6ºC at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 718.6ºC

IDO1/TDO-IN-3

IDO1/TDO-IN-3 is a potent inhibitor of IDO1/TDO. IDO1/TDO-IN-3 exhibits significant activities against IDO1 (IC50: 0.005 μM) and TDO (IC50: 0.004 μM). IDO1/TDO-IN-3 shows considerable in vivo anti-tumor activity and no obvious toxicity is observed[1].

  • CAS Number: 2347579-03-5
  • MF: C16H6ClF2N3O2
  • MW: 345.69
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Palmatine hydroxide

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[1][2][3][4][5].

  • CAS Number: 131-04-4
  • MF: C21H23NO5
  • MW: 369.41100
  • Catalog: Bacterial
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1/TDO-IN-6

IDO1/TDO-IN-6 (compound 11) is a dual inhibitor of IDO1/TDO with IC50s of 2.25 and 2.89 μM, respectively. IDO1/TDO-IN-6 has inhibitory effects on IDO1 and TDO, with Ki values of 1.9 and 3.1 μM, respectively. IDO1/TDO-IN-6 can be used in cancer and immunology research[1].

  • CAS Number: 2948772-71-0
  • MF: C20H17NO5
  • MW: 351.35
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1/TDO-IN-1

IDO1/TDO-IN-1 (30) is a potent dual IDO1 (uncompetitive, Ki of 0.23 μM) and TDO (competitive, Ki of 0.73 μM) inhibitor. IDO1/TDO-IN-1 (30) significantly promotes cell apoptosis through the potential mitochondria-mediated Bcl-2/Bax pathway[1].

  • CAS Number: 2379527-72-5
  • MF: C21H16O6
  • MW: 364.35
  • Catalog: Apoptosis
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1-IN-2

IDO1-IN-2 (compound 16) is a potent and selective IDO1 inhibitor with IC50s of 81 nM, 59 nM (mouse) and 28 nM (rat), respectively. IDO1-IN-2 has anti-cancer activity[1].

  • CAS Number: 2346614-58-0
  • MF: C15H17FN6O4
  • MW: 364.33
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

(S)-Indoximod

(S)-Indoximod (1-Methyl-L-tryptophan) is an inhibitor of indoleamine 2,3-dioxygenase (IDO). (S)-Indoximod can be used for the research of cancer[1][2].

  • CAS Number: 21339-55-9
  • MF: C12H14N2O2
  • MW: 218.252
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: 1.28
  • Boiling Point: 429.3±35.0 °C at 760 mmHg
  • Melting Point: 223-226 ºC
  • Flash Point: 213.4±25.9 °C

PF-06840003

PF-06840003 is a highly selective orally bioavailable IDO-1 inhibitor.

  • CAS Number: 198474-05-4
  • MF: C12H9FN2O2
  • MW: 232.21000
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IACS-8968 R-enantiomer

IACS-8968 (R-enantiomer) is the R-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.

  • CAS Number: 2239305-67-8
  • MF: C17H18F3N5O2
  • MW: 381.35
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Navoximod

Navoximod is a potent IDO (indoleamine-(2,3)-dioxygenase) pathway inhibitor with Ki/EC50 of 7 nM/75 nM.

  • CAS Number: 1402837-78-8
  • MF: C18H21FN2O2
  • MW: 316.370
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: 1.4±0.1 g/cm3
  • Boiling Point: 555.4±35.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 289.7±25.9 °C

IDO-IN-8

IDO-IN-8 (NLG-1487) is an indoleamine 2,3-dioxygenase (IDO) inhibitor extracted from patent WO WO2012142237A1, compound 1487, has an IC50 of 1-10 μM.

  • CAS Number: 1402837-77-7
  • MF: C18H21FN2O2
  • MW: 316.370
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: 1.4±0.1 g/cm3
  • Boiling Point: 555.4±35.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 289.7±25.9 °C

4-Phenyl-1H-1,2,3-triazole

4-Phenyl-1H-1,2,3-triazole is an IDO1 inhibitor (IC50: 60 渭M). 4-Phenyl-1H-1,2,3-triazole can be used for cancer research[1].

  • CAS Number: 1680-44-0
  • MF: C8H7N3
  • MW: 145.16
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: 1.2±0.1 g/cm3
  • Boiling Point: 346.0±11.0 °C at 760 mmHg
  • Melting Point: 143-14℃
  • Flash Point: 169.4±12.2 °C

IDO1-IN-20

Hy-146215 is an enzyme that catalyzes the oxidative metabolism of tryptophan. It can immunosuppress tumors in the tumor microenvironment.

  • CAS Number: 2415246-15-8
  • MF: C15H19BrFN7O4S
  • MW: 492.32
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO-IN-6

IDO-IN-6 (NLG-1486) is an indoleamine 2,3-dioxygenase (IDO) inhibitor extracted from patent WO WO2012142237A1, Compound 1486, has an IC50 of <1 μM.

  • CAS Number: 1402837-76-6
  • MF: C18H21FN2O2
  • MW: 316.370
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: 1.4±0.1 g/cm3
  • Boiling Point: 555.4±35.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 289.7±25.9 °C

GNF-PF-3777

8-Nitrotryptanthrin is a potent human indoleamine 2,3-dioxygenase 2 (hIDO2) inhibitor which significantly reduces IDO2 activity with Ki of 0.97 μM.

  • CAS Number: 77603-42-0
  • MF: C15H7N3O4
  • MW: 293.23
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO-IN-1

IDO-IN-1 is a potent indoleamine 2,3-dioxygenase (IDO) inhibitor with an IC50 of 59 nM.

  • CAS Number: 914638-30-5
  • MF: C9H7BrFN5O2
  • MW: 316.08700
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IDO1-IN-17

IDO1-IN-17 (I-4) is an IDO1 inhibitor, with an IC50 of 0.44 μM in hela cells[1].

  • CAS Number: 2677054-58-7
  • MF: C28H32BrClFN5O2
  • MW: 604.94
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

palmatine

Palmatine is an orally active and irreversible indoleamine 2,3-dioxygenase 1 (IDO-1) inhibitor. Palmatine can ameliorate DSS-induced colitis by mitigating colonic injury, preventing gut microbiota dysbiosis, and regulating tryptophan catabolism. Palmatine has the potential for colitis treatment[1].

  • CAS Number: 3486-67-7
  • MF: C21H22NO4+
  • MW: 352.403
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: 205ºC
  • Flash Point: N/A

Indoximod

Indoximod (D-1MT, NLG8189) is an indoleamine 2,3-dioxygenase (IDO) pathway inhibitor with a Ki of 19 μM.

  • CAS Number: 110117-83-4
  • MF: C12H14N2O2
  • MW: 218.252
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: 1.3±0.1 g/cm3
  • Boiling Point: 429.3±35.0 °C at 760 mmHg
  • Melting Point: 242-245 ℃(lit.)
  • Flash Point: 213.4±25.9 °C

IDO1-IN-12

IDO1-IN-12 is a potent and orally available IDO1 inhibitor.

  • CAS Number: 2379570-48-4
  • MF: C21H19F3N2O2
  • MW: 388.38
  • Catalog: Indoleamine 2,3-Dioxygenase (IDO)
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A