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J Biol Chem, Vol. 273, Issue 33, 20728-20736, August 14, 1998
From the Institut de Génétique et de Biologie
Moléculaire et Cellulaire, CNRS/INSERM/ULP, Collège de
France, BP 163, 67404 Illkirch Cedex, France
The pleiotropic effects of retinoids are mediated
by nuclear receptors that are activated by 9-cis- or
all-trans-retinoic acid to function as
ligand-dependent transcription factors. In a yeast
one-hybrid screen for proteins capable of interacting with native
retinoic acid receptor (RAR), we have isolated the T:G
mismatch-specific thymine-DNA glycosylase (TDG), which initiates the
repair of T:G mismatches caused by spontaneous deamination of
methylated cytosines. Here, we report that TDG can interact with RAR
and the retinoid X receptor (RXR) in a ligand-independent manner, both
in yeast and in vitro. Mapping of the binding sites revealed interaction with a region of the ligand binding domain harboring
Retinoic Acid Receptors Interact Physically and Functionally with
the T:G Mismatch-specific Thymine-DNA Glycosylase
-helix 1 in both RAR and RXR. In transient transfection experiments, TDG potentiated transactivation by RXR from a direct repeat element spaced by one nucleotide (DR1) and by RXR/RAR
heterodimers from a direct repeat element spaced by five nucleotides
(DR5). In vitro, TDG enhanced RXR and RXR/RAR binding to
their response elements. These data indicate that TDG is not only a
repair enzyme, but could also function in the control of
transcription.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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