3-Iodo-L-tyrosine

3-Iodo-L-tyrosine is a tyrosine-derived amino acid bearing an iodine atom at the 3-position of the aromatic ring, retaining the L-configuration at the alpha carbon. This halogenated phenol is widely used as a site-selective aromatic iodination handle for chemical synthesis and for preparing defined iodinated tyrosine-containing motifs used in biochemical and analytical workflows. The presence of the phenolic hydroxyl and the ortho/para electronic effects of the iodine substitution make it a practical building block for radioiodination-compatible and mass-specification-ready tyrosine analogs.

1. Iodinated Peptide Building Block

3-Iodo-L-tyrosine is used in custom peptide synthesis when a defined iodinated tyrosine residue is required for downstream conjugation, labeling, or analytical tracking. Research groups and peptide manufacturers incorporate this residue into peptide sequences to create tyrosine-containing fragments with a controlled aromatic substitution pattern, enabling consistent behavior across batches and facilitating subsequent derivatization steps. The iodinated aromatic ring provides a chemically distinct site compared with unmodified tyrosine, supporting workflows where the tyrosine position must be chemically identifiable by mass spectrometry or by iodination-based transformations.

2. Protein Labeling And Bioconjugation

3-Iodo-L-tyrosine is commonly selected for protein and biomolecule labeling strategies that rely on an iodinated tyrosine motif as a defined chemical handle. Chemical biology teams use iodinated tyrosine analogs to generate labeled peptide standards, to prepare defined conjugation reagents, or to construct protein/peptide conjugates where aromatic iodination provides a measurable tag for analytical readouts. The retained phenolic functionality also supports controlled functionalization chemistry in labeling pipelines, allowing researchers to maintain a tyrosine-like reactive site while introducing an iodine-specific signature.

3. Stable Isotope And Mass Spec Standards

3-Iodo-L-tyrosine is frequently used as an analytical reference material for LC-MS and related mass spectrometric workflows that require an iodinated tyrosine standard. Analytical chemistry groups use this compound to confirm chromatographic retention and to verify ionization behavior for iodinated aromatic species, as well as to support method development for assays that monitor iodinated tyrosine-containing peptides or degradation/processing products. Because the iodine substitution yields a characteristic mass shift relative to native tyrosine, it helps improve specificity when distinguishing tyrosine analogs in complex mixtures.

4. Radioiodination-Compatible Tyrosine Analog

3-Iodo-L-tyrosine is used as a precursor in labeling workflows where iodine chemistry is central to creating iodinated tyrosine-containing probes and reference materials. Research laboratories that develop iodinated biomolecular reagents rely on this defined iodinated amino acid to streamline preparation of iodinated tyrosine motifs with reproducible substitution patterns. This is particularly valuable for studies that require consistent iodinated aromatic content across probe batches, supporting downstream characterization and comparative analytical experiments.

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