3,5-Diiodo-L-tyrosine is a naturally occurring, proteinogenic amino acid derivative in which the tyrosine aromatic ring bears two iodine substituents at the 3 and 5 positions, with the amino acid framework retaining an α-amino group and an α-carboxyl group. The molecule features a phenolic side chain characteristic of tyrosine, modified by iodination that increases the mass and alters the electronic and hydrogen-bonding environment of the aromatic hydroxyl while maintaining the L stereochemical designation indicated in the name. In research and analytical workflows, this iodinated amino acid is used as a substrate or reference material for studying iodinated tyrosine chemistry, supporting structure-activity and labeling experiments, and enabling mass spectrometric or spectroscopic detection of tyrosine-containing species.
3,5-Diiodo-L-tyrosine is an iodinated tyrosine derivative bearing two iodine atoms on the aromatic ring, providing a chemically distinctive, heavy-atom-rich phenolic amino acid scaffold. As a non-proteinogenic, halogenated amino acid, it is frequently used in radiochemistry-adjacent and analytical workflows where iodine content and aromatic substitution pattern are key to assay performance, labeling chemistry, or reference material preparation. Its phenolic and amino functionalities make it a practical building block for downstream derivatization while the L-configuration supports consistent stereochemical handling in peptide and bioconjugation contexts.
1. Radioiodination-Style Labeling
3,5-Diiodo-L-tyrosine is used as a defined iodinated tyrosine building block in labeling chemistry workflows that require an iodine-substituted aromatic amino acid motif. Research groups developing iodinated ligands, iodinated peptide fragments, or iodine-rich standards often select this scaffold to control substitution patterns and iodine density before final conversion to more reactive or detectable iodine forms. The presence of two ring iodines supports downstream derivatization strategies where maintaining a specific iodination pattern is important for reproducible labeling outcomes and consistent analytical readouts.
2. Iodinated Peptide Building Block
3,5-Diiodo-L-tyrosine supports the preparation of iodinated peptide analogs and peptide fragments used in chemical biology and protein-chemistry studies. Investigators incorporate this amino acid derivative into custom peptides to introduce a stable, heavy-atom aromatic residue that can be used for structural probing, method development, or comparative studies of iodine substitution effects on peptide behavior during purification and characterization. The L-tyrosine backbone and the phenolic group enable practical downstream functionalization routes when iodinated aromatic residues are required as part of a defined peptide architecture.
3. Analytical Reference Standards
3,5-Diiodo-L-tyrosine is widely used to prepare analytical standards for chromatographic and mass spectrometric characterization of iodinated tyrosine species and related iodinated biomolecule fragments. Analytical method developers and quality-control laboratories use this compound to benchmark retention behavior, confirm mass signatures for diiodinated tyrosine derivatives, and support identification workflows in complex mixtures where iodine substitution patterns distinguish closely related analytes. The defined diiodo substitution makes it particularly valuable for calibrations and for verifying specificity when monitoring iodinated aromatic metabolites or derivatized tyrosine standards.
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