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.
journal_name
Mol Pharmacoljournal_title
Molecular pharmacologyauthors
Bacsi SG,Reisz-Porszasz S,Hankinson Osubject
Has Abstractpub_date
1995-03-01 00:00:00pages
432-8issue
3eissn
0026-895Xissn
1521-0111journal_volume
47pub_type
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journal_title:Molecular pharmacology
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更新日期:1990-02-01 00:00:00
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journal_title:Molecular pharmacology
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更新日期:1990-03-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
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更新日期:1989-07-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1995-08-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-01-01 00:00:00
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journal_title:Molecular pharmacology
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doi:
更新日期:1995-11-01 00:00:00
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更新日期:2006-08-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-10-01 00:00:00
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doi:
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