Definition

Noun: 1. A tyrosine derivative containing iodine: A chemical compound formed by the addition of iodine to the amino acid tyrosine. It is a precursor in the biosynthesis of thyroid hormones.

Usage

• Scientific/Biochemical Context: The term is used almost exclusively in biochemistry, endocrinology, and medical contexts to describe specific iodinated amino acids.
  • Monoiodotyrosine and diiodotyrosine are the two primary forms of iodotyrosine.
  • The enzyme thyroid peroxidase catalyzes the formation of iodotyrosine from tyrosine within the thyroid gland.

Advanced Usage

• Specific Compounds: The term often appears modified to specify the number of iodine atoms attached.
  • Monoiodotyrosine (MIT): Tyrosine with one iodine atom attached.
  • Diiodotyrosine (DIT): Tyrosine with two iodine atoms attached.
• Physiological Role: Used to describe intermediates in a metabolic pathway.
  • The coupling of two iodotyrosine molecules (DIT + DIT) forms thyroxine (T4).

Variants and Related Words

• Iodotyrosine deiodinase: An enzyme that removes iodine from iodotyrosine, allowing iodine to be recycled within the thyroid gland.
• Tyrosine: The parent amino acid to which iodine is added to form iodotyrosine.

Synonyms

• Iodinated tyrosine
• (Specific forms) Monoiodotyrosine, Diiodotyrosine

Different Meanings

This word has a single, highly specific meaning in biochemistry and does not have other common definitions or usages in general English.

Noun

1. tyrosine with iodine added