Dityrosine

Dityrosine
Identifiers
CAS Number	980-21-2 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	2228674
ChEBI	CHEBI:50607;
ChemSpider	97033;
PubChem CID	107904;
CompTox Dashboard (EPA)	DTXSID101318376 ;
	InChI InChI=1S/C18H20N2O6/c19-13(17(23)24)7-9-1-3-15(21)11(5-9)12-6-10(2-4-16(12)22)8-14(20)18(25)26/h1-6,13-14,21-22H,7-8,19-20H2,(H,23,24)(H,25,26) Key: OQALFHMKVSJFRR-UHFFFAOYSA-N;
	SMILES C1=CC(=C(C=C1CC(C(=O)O)N)C2=C(C=CC(=C2)CC(C(=O)O)N)O)O;
Properties
Chemical formula	C18H20N2O6
Molar mass	360.366 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Dityrosine is a dimeric form of tyrosine. Whereas tyrosine itself is a proteinogenic amino acid, dityrosine is non-proteinogenic. Various enzymes, such as CYP56A1 and myeloperoxidase, catalyze the oxidation of tyrosine residues in protein chains to form dityrosine crosslinks in various organisms. It was first isolated from rubber protein of locust wing ligament.^{[citation needed]} Its formation can also be induced by various radical-forming agents.

The 2,2'-biphenol structural motif allows dityrosine to form a complex with borate.^[1] Affinity chromatography with a column containing immobilised phenylboronic acid has allowed development of several methods for purification of dityrosine.^[2]

The tyrosine–tyrosine crosslink can form by ultraviolet irradiation and other conditions that induce radical formation.^[2] Proteins with calciuim binding sites consisting of two tyrosine residues, calmodulin and troponin C, are especially prone to this reaction as a result of coodination of calcium ion. The monomer and dimer have different emission wavelengths, which can complicate fluorescence spectroscopic analysis.^[3] The dimerization occurs when a calcium ion binds two suitably-positioned tyrosine residues, so .

The presence of dityrosine is a general biomarker for oxidative stress.^[4]

References

^ Malencik, D. A.; Anderson, S. R. (1991). "Fluorometric characterization of dityrosine: Complex formation with boric acid and borate ion". Biochem. Biophys. Res. Commun. 178 (1): 60–67. doi:10.1016/0006-291x(91)91779-c. PMID 2069580.
^ ^a ^b Malencik, Dean A.; Sprouse, James F.; Swanson, Chris A.; Anderson, Sonia R. (1996). "Dityrosine: preparation, isolation, and analysis". Anal Biochem. 242 (2): 202–213. doi:10.1006/abio.1996.0454.
^ Malencik, Dean A.; Anderson, Sonia R. (1987). "Dityrosine formation in calmodulin". Biochemistry. 26 (3): 695–704. doi:10.1021/bi00377a006.
^ DiMarco, Theresa; Giulivi, Cecilia (2007). "Current analytical methods for the detection of dityrosine, a biomarker of oxidative stress, in biological samples". Mass Spectrometry Reviews. 26 (1): 108–120. doi:10.1002/mas.20109.

Category:Non-proteinogenic amino acids

[1] Malencik, D. A.; Anderson, S. R. (1991). "Fluorometric characterization of dityrosine: Complex formation with boric acid and borate ion". Biochem. Biophys. Res. Commun. 178 (1): 60–67. doi:10.1016/0006-291x(91)91779-c. PMID 2069580.

[prep-isolation-analysis-2] Malencik, Dean A.; Sprouse, James F.; Swanson, Chris A.; Anderson, Sonia R. (1996). "Dityrosine: preparation, isolation, and analysis". Anal Biochem. 242 (2): 202–213. doi:10.1006/abio.1996.0454.

[3] Malencik, Dean A.; Anderson, Sonia R. (1987). "Dityrosine formation in calmodulin". Biochemistry. 26 (3): 695–704. doi:10.1021/bi00377a006.

[4] DiMarco, Theresa; Giulivi, Cecilia (2007). "Current analytical methods for the detection of dityrosine, a biomarker of oxidative stress, in biological samples". Mass Spectrometry Reviews. 26 (1): 108–120. doi:10.1002/mas.20109.

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