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J Biol Chem, Vol. 274, Issue 40, 28385-28394, October 1, 1999
From the Transcription of the L-type pyruvate
kinase (L-PK) gene is induced by glucose in the presence of insulin and
repressed by glucagon via cyclic AMP. The DNA regulatory sequence
responsible for mediating glucose and cyclic AMP responses, called
glucose response element (GlRE), consists of two degenerated E boxes
spaced by 5 base pairs and is able to bind basic
helix-loop-helix/leucine zipper proteins, in particular the upstream
stimulatory factors (USFs). From ex vivo and in
vivo experiments, it appears that USFs are required for correct
response of the L-PK gene to glucose, but their expression and binding
activity are not known to be regulated by glucose. A genetic screen in
yeast has allowed us to identify a novel transcriptional factor binding
to the GlRE, i.e. the chicken ovalbumin upstream
promoter-transcription factor II (COUP-TFII). Binding of COUP-TFII to
the GlRE was confirmed by electrophoretic mobility shift
assays, and COUP-TFII-containing complexes were detectable in liver
nuclear extracts. Neither abundance nor binding activity of COUP-TFII
appeared to be significantly regulated by diets. In footprinting
experiments, two COUP-TFII-binding sites overlapping the E boxes were
detected. Overexpression of COUP-TFII abrogated the
USF-dependent transactivation of an artificial GlRE-dependent promoter in COS cells and the glucose
responsiveness of the L-PK promoter in hepatocytes in primary culture.
In addition, a mutated GlRE with increased affinity for USF and very
low affinity for COUP-TFII conferred a dramatically decreased glucose
responsiveness on the L-PK promoter in hepatocytes in primary culture
by increasing activity of the reporter gene in low glucose condition.
We propose that COUP-TFII could be a negative regulatory component of
the glucose sensor complex assembled on the GlRE of the L-PK gene and
most likely of other glucose-responsive genes as well.
Chicken Ovalbumin Upstream Promoter-Transcription Factor II, a
New Partner of the Glucose Response Element of the L-type Pyruvate
Kinase Gene, Acts as an Inhibitor of the Glucose Response
,
,
, and
Institut Cochin de Génétique
Moléculaire, U129 INSERM, Université René Descartes,
75014 Paris, France, ** CJF 97-03 INSERM, Université René
Descartes, 75014 Paris, France, and the §§ CNRS,
Centre de Génétique Moléculaire, 91198 Gif sur
Yvette, France
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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