CDNA encoding the type I iodothyronine 5'deiodinase

Details CDNA encoding the type I iodothyronine 5'deiodinase CDNA encoding the type I iodothyronine 5'deiodinase

1992-01-29

1993-12-21

Wax, Robert A.

Chemistry: molecular biology and microbiology

Enzyme , proenzyme; compositions thereof; process for...

Oxidoreductase

435 691, 4351721, 4352523, 4353201, 536 232, 536 241, 935 9, 935 11, 935 22, 935 44, 935 66, 935 79, G12N 1553, G12N 1511, G12N 1563, C12P 2100

Patent

active

052720780

ABSTRACT:
The present invention is directed to the cloning, sequencing, and uses of a nucleotide sequence encoding the mammalian enzyme Type I iodothyronine 5' deiodinase and mutant sequences thereof. This enzyme catalyzes the conversion of thyroxine to triiodothyronine, producing the active form of thyroid hormone. The invention is further directed to the discovery that an untranslated nucleotide sequence is necessary for the recognition of a TGA (termination) codon in the coding region of 5' deiodinase as encoding selenocysteine, an amino acid essential for the full activity of 5' deiodinase. The mechanism by which this recognition occurs involves a stem-loop structure in the 3' untranslated region of the mRNA. The untranslated sequence can be used to incorporate selenocysteine into non-selenocysteine-containing proteins and polypeptides.

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