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Volume 272, Number 50, Issue of December 12, 1997
pp. 31845-31854
(Received for publication, May 14, 1997, and in revised form, October 3, 1997)
From the Department of Pathology and Laboratory Medicine, UCLA
Jonsson Comprehensive Cancer Center, and Molecular Biology Institute,
University of California, Los Angeles, California 90095-1732
Introduction of a retroviral expression vector
for the aryl hydrocarbon receptor (AHR) restores CYP1A1 inducibility to
a mutant derivative of the Hepa-1 cell line that is defective in
induction of CYP1A1 by ligands for the receptor. An AHR protein with
normal ligand binding activity is expressed in the mutant but ligand treatment of mutant cell extract fails to induce binding of the AHR·ARNT (aryl hydrocarbon receptor nuclear translocator) dimer to
the xenobiotic responsive element (XRE). AHR cDNAs derived from the
mutant encode a protein that is unimpaired in
ligand-dependent dimerization with ARNT, but the AHR·ARNT
dimer so formed is severely impaired in XRE binding activity. The
mutant cDNAs contain a C to G mutation at base 648, causing a
cysteine to tryptophan alteration at amino acid 216, located between
the PER-ARNT-SIM homology region (PAS) A and PAS B repeats.
Introduction of the same mutation in the wild-type AHR sequence by
site-directed mutagenesis similarity impaired XRE binding activity.
Substitution with the conservative amino acid, serine, had no effect on
XRE binding. The tryptophan mutation, but not the wild-type allele, was
detectable in genomic DNA of the mutant. The implication that an amino
acid within the PAS region may be involved in DNA binding indicates
that the DNA binding behavior of AHR may be more anomalous than
previously suspected.
A Mutation in the Aryl Hydrocarbon Receptor (AHR) in a Cultured
Mammalian Cell Line Identifies a Novel Region of AHR That Affects DNA
Binding
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