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Indoleamine 2,3-dioxygenase. Purification and some properties
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Indoleamine 2,3-dioxygenase was purified from rabbit small intestine to apparent homogeneity as judged by polyacrylamide gel electrophoresis and analytical ultracentrifugation. The native enzyme was a monomeric protein of a molecular weight of 41,000 +/- 1,000 with an s020,w value of 3.45 S. It had a relative abundance of hydrophobic amino acids such as valine, leucine, and isoleucine, and contained approximately 5% carbohydrate by weight. The estimated content of sugar residues per mol of enzyme was: galactose, 1.2; mannose, 2.6; N-acetylglucosamine, 5.2; and sialic acid, 0.8. One mole of enzyme had 0.8 mol of protoheme IX as a prosthetic group. However, copper was not detected in a significant amount and the ratio of copper to heme was less than 0.03. EPR spectra of the nitric oxide complex of the ferrous enzyme indicated that a nitrogen atom, possibly in an imidazole group, might be coordinated as the fifth ligand of the heme coenzyme. The anisotropic g values were gx = 2.08, gy = 1.98, and gz = 2.01. A single enzyme protein catalyzed the oxygenative ring cleavage of D- and L-tryptophan, D- and L-5-hydroxytryptophan, tryptamine, and serotonin. In addition, the purified enzyme had a peroxidase activity with guaiacol and potassium iodide as hydrogen donors, but not a catalase activity.
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“Increased IDO expression is responsible for the catabolism of TRP in the KYN degradation pathway [36] and is canonically upregulated by inflammatory mechanisms [37,38].”
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“(1,2) IDO activity represents the ratelimiting step in tryptophan catabolism along the kynurenine pathway and is an important antimicrobial defense mechanism.(3) IDO activity protects host cells from tryptophan auxotrophic pathogens by depleting pools of tryptophan required for their protein synthesis.”
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“Indoleamine 2, 3-dioxygenase 1 (IDO1, hereafter referred to as IDO) is a 403 amino acid cytosolic haem-containing enzyme involved in the first, rate-limiting step of the tryptophan (Trp) metabolism to kynurenine (Kyn) (1, 2).”
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“…is the oxidative cleavage of TRP by one of the three rate-limiting enzymes, namely, tryptophan 2,3-dioxygenase (TDO), indoleamine 2,3-dioxygenase 1 (IDO1), or indoleamine 2,3- dioxygenase 2 (IDO2), which convert TRP to N-formylkynurenine (Ball et al., 2007; Metz et al., 2007; Shimizu et al., 1978).”
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“In addition, IDO also degrades 5′hydroxytryptophan (5- HTP) and 5-HT to 5-hydroxykynuramine (Fujiwara et al., 1979; Shimizu et al., 1978) (Fig.”
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“Moreover, the Km values for leucine, tryptophan, and arginine transport via systems B0,1 and b0,1 are in the low micromolar range [23, 42, 58], and they are lower than the Km value of IDO for tryptophan [95, 98].”
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“IDO has been shown to mediate the inhibition by catalyzing the decyclization of tryptophan to N-formylkynurenine (12), thus depriving the infecting organism of the essential amino acid tryptophan (9).”
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In Vivo Uptake and Metabolism of α-[11C]Methyl- l -Tryptophan in Human Brain Tumors
Juhász, C., Chugani, D. C., Muzik, O., Wu, D., Sloan, A. E., Barger, G. R., Watson, C. E., Shah, A. K., Sood, S., Ergün, E. L., et al. (2005) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1038/sj.jcbfm.9600199 · Cited by 93
Identification of Tryptophan 2,3‐Dioxygenase RNA in Rodent Brain
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Immunological Relevance of the Coevolution of IDO1 and AHR
Jaronen, M., & Quintana, F. J. (2014) · Frontiers in Immunology · doi:10.3389/fimmu.2014.00521 · Cited by 85
“Indoleamine-2,3-dioxygenase (IDO1), tryptophan2,3-dioxygenase (TDO), and recently discovered IDO-related enzyme IDO2 (54) are the first and rate-limiting enzymes converting tryptophan to N -formylkynurenine (55, 56) which is then metabolized to l-kynurenine.”
BackgroundPossible roles of excess tryptophan metabolites in cancer
Chung, K., & Gadupudi, G. S. (2010) · Environmental and Molecular Mutagenesis · doi:10.1002/em.20588 · Cited by 81
“Although both TDO and IDO catalyze the same reaction [Shimizu et al., 1978; Yamazaki et al., 1985], TDO is highly substrate-specific, only dioxygenating L-tryptophan and some tryptophan derivatives substituted in the five- and six-positions.”
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El-zaatari, M., Chang, Y.-M., Zhang, M. F., Franz, M., Shreiner, A., McDermott, A. J., van der Sluijs, K. F., Lutter, R., Grasberger, H., Kamada, N., et al. (2014) · Journal of Immunology · doi:10.4049/jimmunol.1302913 · Cited by 75
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“IDO catalyzes the decyclization of L -tryptophan into N -formylkynurenine, 5 thereby limiting the availability of this essential amino acid and, consequently, inhibiting the growth of tryptophan auxotrophs.”
A Perspective on the Safety of Supplemental Tryptophan Based on Its Metabolic Fates.
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A high-affinity, tryptophan-selective amino acid transport system in human macrophages
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“IDO was originally discovered in 1967 (7,8) in the rabbit small intestine and was first purified in 1978 (9).”
BackgroundBiochemical characteristics and inhibitor selectivity of mouse indoleamine 2,3-dioxygenase-2
Austin, C. J. D., Mailu, B. M., Maghzal, G., Sánchez-Pérez, Á., Rahlfs, S., Zocher, K., Yuasa, H., Arthur, J. W., Becker, K., Stocker, R., et al. (2010) · Amino Acids · doi:10.1007/s00726-010-0475-9 · Cited by 71
Tryptophan metabolism in breast cancers: molecular imaging and immunohistochemistry studies
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“However, it is a substrate for TPH (leading to synthesis of alpha-methyl-serotonin) [19,20] and IDO (due to its low substrate specificity) [21,22].”
BackgroundResearch Progress of Indoleamine 2,3-Dioxygenase Inhibitors
Jiang, T., Sun, Y., Yin, Z., Feng, S., Sun, L., & Li, Z. (2015) · Future Medicinal Chemistry · doi:10.4155/fmc.14.151 · Cited by 73
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Analysis of Transcription Factors Regulating Induction of Indoleamine 2,3-Dioxygenase by IFN- gamma
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“(25,38) Substantial increases in the tryptophan-kynurenine pathway metabolites, 1-kynurenine and the neuro-toxin quinolinic acid, occur in human brain, blood, and systemic tissues during immune activation.”
Lood, C., Tydén, H., Gullstrand, B., Klint, C., Wenglén, C., Nielsen, C., Heegaard, N., Jönsen, A., Kahn, R., & Bengtsson, A. (2015) · PLoS ONE · doi:10.1371/journal.pone.0125109 · Cited by 67
“Interestingly, even though IDO mainly catalyzes the conversion of tryptophan into kynurenine, several other IDO substrates have been described, including serotonin itself [44].”
BackgroundThe Kynurenine Pathway in Stem Cell Biology
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Characterization and evolution of vertebrate indoleamine 2, 3-dioxygenases
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The Mechanism of Substrate Inhibition in Human Indoleamine 2,3-Dioxygenase
Efimov, I., Basran, J., Sun, X., Chauhan, N., Chapman, S., Mowat, C., & Raven, E. (2012) · Journal of the American Chemical Society · doi:10.1021/ja208694g · Cited by 65
Indoleamine and tryptophan 2,3-dioxygenases as important future therapeutic targets
Dolšak, A., Gobec, S., & Sova, M. (2020) · Pharmacology & Therapeutics · doi:10.1016/j.pharmthera.2020.107746 · Cited by 73
Metadata
- Authors
- Shimizu, T., Nomiyama, S., Hirata, F., & Hayaishi, O.
- Affiliations
- Kyoto University (JP)
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1978-07
- Volume
- 253
- Issue
- 13
- Pages
- 4700-4706
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1607682771
- Cited by
- 367
- References
- 38
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 6 · 2023: 5 · 2022: 3 · 2021: 14 · 2020: 9 · 2019: 10 · 2018: 9 · 2017: 13 · 2016: 15 · 2015: 12 · 2014: 13 · 2013: 12 · 2012: 20
- FWCI
- 5.77
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Hemoglobin structure and function
- Keywords
- indoleamine 2,3-dioxygenase, enzyme purification, rabbit small intestine, protoheme, sialic acid, carbohydrate content, protein secondary structure, electron spin resonance, tryptophan oxidation, serotonin oxidation, peroxidase activity, guaiacol
- MeSH terms
- Amino Acids, Animals, Electrophoresis, Disc, Hexoses, Hydrogen-Ion Concentration, Indoles, Intestine, Small, Molecular Weight, Oxygenases, Rabbits, Seasons, Substrate Specificity
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