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Record Information
StatusDetected and Quantified
Creation Date2005-11-16 15:48:42 UTC
Update Date2020-02-26 21:21:48 UTC
Secondary Accession Numbers
  • HMDB00021
Metabolite Identification
Common NameIodotyrosine
DescriptionIodotyrosine is an iodated derivative of L-tyrosine. This is an early precursor to L-thyroxine, one of the primary thyroid hormones. In the thyroid gland, iodide is trapped, transported, and concentrated in the follicular lumen for thyroid hormone synthesis. Before trapped iodide can react with tyrosine residues, it must be oxidized by thyroid peroxidase. Iodotyrosine is made from tyrosine via thyroid peroxidase and then further iodinated by this enzyme to make the di-iodo and tri-iodo variants. Two molecules of di-iodotyrosine combine to form T4, and one molecule of mono-iodotyrosine combines with one molecule of di-iodotyrosine to form T3.
(2S)-2-Amino-3-(4-hydroxy-3-iodophenyl)propanoic acidChEBI
Chemical FormulaC9H10INO3
Average Molecular Weight307.0851
Monoisotopic Molecular Weight306.970536611
IUPAC Name(2S)-2-amino-3-(4-hydroxy-3-iodophenyl)propanoic acid
Traditional Nameiodotyrosine
CAS Registry Number70-78-0
InChI Identifier
Chemical Taxonomy
Description belongs to the class of organic compounds known as tyrosine and derivatives. Tyrosine and derivatives are compounds containing tyrosine or a derivative thereof resulting from reaction of tyrosine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom.
KingdomOrganic compounds
Super ClassOrganic acids and derivatives
ClassCarboxylic acids and derivatives
Sub ClassAmino acids, peptides, and analogues
Direct ParentTyrosine and derivatives
Alternative Parents
  • Tyrosine or derivatives
  • Phenylalanine or derivatives
  • 3-phenylpropanoic-acid
  • Alpha-amino acid
  • Amphetamine or derivatives
  • L-alpha-amino acid
  • 2-iodophenol
  • 2-halophenol
  • 1-hydroxy-2-unsubstituted benzenoid
  • Iodobenzene
  • Halobenzene
  • Phenol
  • Aralkylamine
  • Aryl iodide
  • Aryl halide
  • Benzenoid
  • Monocyclic benzene moiety
  • Amino acid
  • Carboxylic acid
  • Monocarboxylic acid or derivatives
  • Organic nitrogen compound
  • Organohalogen compound
  • Primary aliphatic amine
  • Organoiodide
  • Organonitrogen compound
  • Organooxygen compound
  • Primary amine
  • Carbonyl group
  • Hydrocarbon derivative
  • Organic oxide
  • Organopnictogen compound
  • Organic oxygen compound
  • Amine
  • Aromatic homomonocyclic compound
Molecular FrameworkAromatic homomonocyclic compounds
External Descriptors
Physiological effect

Health effect:



Biological location:


Naturally occurring process:


Industrial application:

Physical Properties
Experimental Properties
Melting Point205 °CNot Available
Boiling PointNot AvailableNot Available
Water Solubility3 mg/mLNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.94 g/LALOGPS
pKa (Strongest Acidic)0.99ChemAxon
pKa (Strongest Basic)9.5ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count3ChemAxon
Polar Surface Area83.55 ŲChemAxon
Rotatable Bond Count3ChemAxon
Refractivity60.46 m³·mol⁻¹ChemAxon
Polarizability23.54 ųChemAxon
Number of Rings1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Spectrum TypeDescriptionSplash KeyView
GC-MSGC-MS Spectrum - GC-MS (2 TMS)splash10-0a4j-3913000000-be57e889200c60dc46d4Spectrum
GC-MSGC-MS Spectrum - GC-MS (3 TMS)splash10-014i-1790000000-785b6d6a13d0a8822946Spectrum
GC-MSGC-MS Spectrum - GC-MS (Non-derivatized)splash10-0a4j-3913000000-be57e889200c60dc46d4Spectrum
GC-MSGC-MS Spectrum - GC-MS (Non-derivatized)splash10-014i-1790000000-785b6d6a13d0a8822946Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-03e9-3090000000-2e5cb717605e800d4359Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (2 TMS) - 70eV, Positivesplash10-00sr-9335100000-f5b1c103a54222cc59a3Spectrum
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 10V, Positive (Annotated)splash10-08fu-0094000000-1cca0021f92a06ea8b50Spectrum
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 25V, Positive (Annotated)splash10-01q9-1890000000-ff62addb3c23234d3cefSpectrum
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 40V, Positive (Annotated)splash10-001i-2910000000-1938a4966cb53b4f5ed1Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 10V, Negativesplash10-0a4i-0009000000-29fdc92cbeae7ec37e5dSpectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 20V, Negativesplash10-056r-0923000000-1f98738c0cc639f98dc7Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 30V, Negativesplash10-004i-1900000000-92c150757accb8a27fd9Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 40V, Negativesplash10-004i-2900000000-82ef54ff210098156f8cSpectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 50V, Negativesplash10-004i-2900000000-fffc0c2d97089650aadaSpectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 10V, Positivesplash10-0a4i-0329000000-39b160c87443d51e7611Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 20V, Positivesplash10-03dl-0591000000-c54470130afba37dca28Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 30V, Positivesplash10-03dr-1980000000-31e2dd7b1defc7cfb8c3Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 40V, Positivesplash10-000i-1920000000-8e40ba504d905aa7a528Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 50V, Positivesplash10-05n3-3900000000-368aad6dbdcc312ac3dfSpectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-01ox-0090000000-6e7318a85f3480d07477Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-03ka-0790000000-ed59bbe7e20256d8ad06Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-000i-0900000000-6de0b405d60b85059abcSpectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-0006-0090000000-9e84651efead6b6bfa2cSpectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-00di-0900000000-972b9ebadf10c99787c4Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-014i-0900000000-6150f13b1005b3ec9effSpectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-000b-0900000000-7b5ecd0f27a3ed9d67e2Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-IT (LC/MSD Trap XCT, Agilent Technologies) , Positivesplash10-0a5i-0900000000-ec4129da39ac628164dcSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-08fr-0093000000-003526fc59bf6620307fSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-03di-0090000000-33a24ab6c37733eed168Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0f89-1190000000-9bcf2d08fe940cf418a1Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0a4i-0029000000-b815bb002ee417365e6fSpectrum
1D NMR1H NMR SpectrumNot AvailableSpectrum
2D NMR[1H,13C] 2D NMR SpectrumNot AvailableSpectrum
Biological Properties
Cellular Locations
  • Cytoplasm
Biospecimen Locations
  • Blood
Tissue Locations
  • Thyroid Gland
Normal Concentrations
BloodDetected and Quantified0.00069 +/- 0.00020 uMAdult (>18 years old)BothNormal details
Abnormal Concentrations
BloodDetected and Quantified0.00032 +/- 0.00008 uMAdult (>18 years old)BothAthyroic patients details
Associated Disorders and Diseases
Disease References
  1. Tan SA, Lewis JE, Berk LS, Wilcox RB: Extrathyroidal physiology of monoiodotyrosine in humans. Clin Physiol Biochem. 1990;8(3):109-15. [PubMed:2225717 ]
Associated OMIM IDsNone
DrugBank IDDB01758
Phenol Explorer Compound IDNot Available
FooDB IDFDB021875
KNApSAcK IDNot Available
Chemspider ID388804
KEGG Compound IDC02515
BioCyc IDCPD-12288
BiGG ID39998
Wikipedia Link3-Iodotyrosine
METLIN IDNot Available
PubChem Compound439744
PDB IDNot Available
ChEBI ID27847
Food Biomarker OntologyNot Available
MarkerDB ID
Synthesis ReferenceHillmann, Gunther; Hillmann-Elies, Anneliese. Synthesis of 3-iodo-L-tyrosine. Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie (1956), 305 177-81.
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Sakamoto K, Hayashi A, Sakamoto A, Kiga D, Nakayama H, Soma A, Kobayashi T, Kitabatake M, Takio K, Saito K, Shirouzu M, Hirao I, Yokoyama S: Site-specific incorporation of an unnatural amino acid into proteins in mammalian cells. Nucleic Acids Res. 2002 Nov 1;30(21):4692-9. [PubMed:12409460 ]
  2. Painter K, Vader CR: Interference of iodine-125 ligands in radioimmunoassay: evidence implicating thyroxine-binding globulin. Clin Chem. 1979 May;25(5):797-9. [PubMed:108034 ]
  3. Ismail-Beigi F, Rahimifar M: A variant of iodotyrosine-dehalogenase deficiency. J Clin Endocrinol Metab. 1977 Mar;44(3):499-506. [PubMed:838849 ]
  4. Smythe GA, Compton PJ, Lazarus L: The stimulation of human prolactin secretion by 3-Iodo-L-tyrosine. J Clin Endocrinol Metab. 1975 Apr;40(4):714-6. [PubMed:1127080 ]
  5. Muller EE, Locatelli V, Cella S, Penalva A, Novelli A, Cocchi D: Prolactin-lowering and -releasing drugs. Mechanisms of action and therapeutic applications. Drugs. 1983 Apr;25(4):399-432. [PubMed:6133737 ]
  6. Kucerova Z, Ticha M: Aromatic amino acids and their derivatives as ligands for the isolation of aspartic proteinases. J Chromatogr B Analyt Technol Biomed Life Sci. 2002 Apr 25;770(1-2):121-8. [PubMed:12013218 ]


General function:
Involved in calcium ion binding
Specific function:
Iodination and coupling of the hormonogenic tyrosines in thyroglobulin to yield the thyroid hormones T(3) and T(4).
Gene Name:
Uniprot ID:
Molecular weight:
I(-) + Iodotyrosine → Iodine + L-Tyrosinedetails
Iodotyrosine + 3,5-Diiodo-L-tyrosine + Hydrogen peroxide → Liothyronine + 2-Aminoacrylic acid + Waterdetails
I(-) + 3,5-Diiodo-L-tyrosine → Iodotyrosine + Iodinedetails