title: Cloning of a factor required for activity of the Ah (dioxin) receptor.
abstract: The aryl hydrocarbon (Ah) receptor binds various environmental pollutants, such as polycyclic aromatic hydrocarbons, heterocyclic amines, and polychlorinated aromatic compounds (dioxins, dibenzofurans, and biphenyls), and mediates the carcinogenic effects of these agents. The complementary DNA and part of the gene for an 87-kilodalton human protein that is necessary for Ah receptor function have been cloned. The protein is not the ligand-binding subunit of the receptor but is a factor that is required for the ligand-binding subunit to translocate from the cytosol to the nucleus after binding ligand. The requirement for this factor distinguishes the Ah receptor from the glucocorticoid receptor, to which the Ah receptor has been presumed to be similar. Two portions of the 87-kilodalton protein share sequence similarities with two Drosophila proteins, Per and Sim. Another segment of the protein shows conformity to the consensus sequence for the basic helix-loop-helix motif found in proteins that bind DNA as homodimers or heterodimers.
authors.affiliation: Department of Pathology, University of California, Los Angeles 90024.
authors.forename: E C
authors.initials: EC
authors.lastname: Hoffman
authors.forename: H
authors.initials: H
authors.lastname: Reyes
authors.forename: F F
authors.initials: FF
authors.lastname: Chu
authors.forename: F
authors.initials: F
authors.lastname: Sander
authors.forename: L H
authors.initials: LH
authors.lastname: Conley
authors.forename: B A
authors.initials: BA
authors.lastname: Brooks
authors.forename: O
authors.initials: O
authors.lastname: Hankinson
mesh_terms: D000595:Amino Acid Sequence; D051784:Aryl Hydrocarbon Receptor Nuclear Translocator; D001483:Base Sequence; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D003001:Cloning, Molecular; D003600:Cytosol / Q000378:metabolism; D004268:DNA-Binding Proteins; D006801:Humans; D046911:Macromolecular Substances; D008969:Molecular Sequence Data; D008970:Molecular Weight; D015345:Oligonucleotide Probes; D000072317:Polychlorinated Dibenzodioxins / Q000378:metabolism*; D011506:Proteins / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics; D018336:Receptors, Aryl Hydrocarbon; D011955:Receptors, Drug / Q000235:genetics / Q000378:metabolism*; D012689:Sequence Homology, Nucleic Acid; D014157:Transcription Factors; D014162:Transfection
chemical_list: C497396:ARNT protein, human; D004268:DNA-Binding Proteins; D046911:Macromolecular Substances; D015345:Oligonucleotide Probes; D000072317:Polychlorinated Dibenzodioxins; D011506:Proteins; D012333:RNA, Messenger; D018336:Receptors, Aryl Hydrocarbon; D011955:Receptors, Drug; D014157:Transcription Factors; D051784:Aryl Hydrocarbon Receptor Nuclear Translocator