Iodotyrosine deiodinase is an enzyme that is encoded to the IYD gene of humans. Iodotyrosine deiodinase helps scavenge iodine by removing it from iodinated tyrosines, after these are produced when thyroid hormones that have been broken down as metabolites from their double-tyrosine residue structure.
Unlike the other deiodinases (the iodoTHyronine deiodinases), that remove iodine only from iodinated thyroid hormones while these are still in their double-tyrosine residue form, the iodotyrosine deiodinases remove iodine from iodinated tyrosine as a single amino acid residue. Also, unlike the iodothyronine deiodinases, the tyrosine deiodinase does not use selenium in the active site.