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147 results about "Thyroid hormones" patented technology

Thyroid hormones are two hormones produced and released by the thyroid gland, namely triiodothyronine (T₃) and thyroxine (T₄). They are tyrosine-based hormones that are primarily responsible for regulation of metabolism. T₃ and T₄ are partially composed of iodine. A deficiency of iodine leads to decreased production of T₃ and T₄, enlarges the thyroid tissue and will cause the disease known as simple goitre. The major form of thyroid hormone in the blood is thyroxine (T₄), which has a longer half-life than T₃. In humans, the ratio of T₄ to T₃ released into the blood is approximately 14:1. T₄ is converted to the active T₃ (three to four times more potent than T₄) within cells by deiodinases (5'-iodinase). These are further processed by decarboxylation and deiodination to produce iodothyronamine (T₁a) and thyronamine (T₀a). All three isoforms of the deiodinases are selenium-containing enzymes, thus dietary selenium is essential for T₃ production.

Hormone receptor functional dimers and methods of their use

InactiveUS7057015B1Enhance possibility of producingIncrease flexibilityFusion with DNA-binding domainSugar derivativesADAMTS ProteinsProtein Unit
The invention provides chimeric proteins having at least two functional protein units, each containing the dimerization domain of a member of the steroid/thyroid hormone nuclear receptor superfamily. The chimeric proteins can fold under crystallization conditions to form functional entities. The functional entities optionally contain a novel flexible peptide linker of variable lengths between at least two of the protein units. In a preferred embodiment, the linker is designed to be increased in increments of 12 amino acids each to aid in preparation of variant chimeric proteins. The DNA binding characteristics of the invention functional entities differ from those of wild-type complexes formed between “monomeric” receptors and their binding partners. Some functional entities, e.g. dimers expressed as fusion proteins, transactivate responsive promoters in a manner similar to wild-type complexes, while others do not promote transactivation and function instead essentially as constitutive repressors. The invention further provides nucleotide sequences encoding the invention chimeric proteins, cells containing such nucleotide sequences, and methods for using the invention chimeric proteins to modulate expression of one or more exogenous genes in a subject organism. In addition, isolated protein crystals suitable for x-ray diffraction analysis and methods for obtaining putative ligands for the invention chimeric proteins are provided.
Owner:SALK INST FOR BIOLOGICAL STUDIES
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