title: Isolation of a cDNA clone encoding a biologically active thyroid hormone receptor.
abstract: We have isolated a c-erbA cDNA clone from a GH3 cell library. The clone, denoted erb62, is 4.5 kilobases long and encodes a 461-amino acid beta-type c-erbA protein. This c-erbA protein binds 3,5,3'-triiodothyronine (T3) and T3 analogs with affinities similar to those of the authentic T3 receptor. By RNA gel blot analysis, erb62 hybridizes to a 6-kilobase RNA found in organs that express T3 receptors--e.g., heart, kidney, and brain. A COS-cell transient cotransfection system was used to show that erb62 encodes a biologically active T3 receptor. An oligonucleotide, corresponding to a portion of the rat growth hormone gene 5'-flanking region that contains a T3 response element, was inserted on the 5' side of the herpes simplex virus thymidine kinase promoter in a chloramphenicol acetyltransferase-expressing plasmid. Reporter gene expression directed by this hybrid promoter was T3 inducible only if this plasmid was cotransfected with an erb62-expressing plasmid.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000378:metabolism; D002460:Cell Line; D004247:DNA / Q000235:genetics / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D005786:Gene Expression Regulation / Q000187:drug effects; D007668:Kidney / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009206:Myocardium / Q000378:metabolism; D009693:Nucleic Acid Hybridization; D011401:Promoter Regions, Genetic; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D011988:Receptors, Thyroid Hormone / Q000235:genetics* / Q000378:metabolism; D014162:Transfection; D014284:Triiodothyronine / Q000378:metabolism / Q000494:pharmacology
chemical_list: D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D011988:Receptors, Thyroid Hormone; D014284:Triiodothyronine; D004247:DNA