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- W1860035717 abstract "The 2,3,7,8-tetrachlorodibenzo-p-dioxin-transformed aryl hydrocarbon receptor (AHR) complex binds to xenobiotic-responsive element (XRE) sequences in the 5' flanking region of the CYP1A1 gene, resulting in initiation of transcription. Both components of the transformed AHR complex [the ligand-binding AHR monomer and the AHR nuclear translocator (ARNT)] directly contact the XRE. These proteins belong to a novel subclass of basic helix-loop-helix transcription factors. The binding sites of AHR and ARNT on the asymmetric XRE were determined using nuclear extracts of 2,3,7,8-tetrachlorodibenzo-p-dioxin-treated Hepa-1c1c7 cells and a panel of double-stranded oligonucleotides containing XRE1 of the CYP1A1 gene (5'-TTGCGTGAGAA-3'), in which all combinations of three, two, or one of the thymines indicated were substituted by the photoreactive thymine analog 5-bromodeoxyuracil. Covalent cross-linking analysis and immunoprecipitation with antibodies specific for AHR or ARNT demonstrated that ARNT directly contacts the 3'-most thymine position, that AHR directly contacts the second thymine position, and that neither protein contacts the 5'-most thymine position. The thymine position contacted by ARNT lies within a three-nucleotide sequence (5'-GTG-3') identical to a half-site of an E-box element (5'-CACGTG-3') that is recognized by a number of other basic helix-loop-helix transcription factors. AHR binds to a portion of the XRE that does not resemble an E-box. Additional experiments demonstrated that neither protein loops over to contact residues located beyond the other's binding site." @default.
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- W1860035717 date "1995-03-01" @default.
- W1860035717 modified "2023-09-23" @default.
- W1860035717 title "Orientation of the heterodimeric aryl hydrocarbon (dioxin) receptor complex on its asymmetric DNA recognition sequence." @default.
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