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Originally published In Press as doi:10.1074/jbc.M104185200 on July 25, 2001
J. Biol. Chem., Vol. 276, Issue 40, 37011-37019, October 5, 2001
EF1 Binds to a Far Upstream Sequence of the Mouse Pro- 1(I)
Collagen Gene and Represses Its Expression in Osteoblasts*
Catherine
Terraz §,
Dave
Toman¶,
Madeleine
Delauche ,
Pierre
Ronco , and
Jerome
Rossert
From the INSERM U489 and Université Paris VI,
Paris, France and ¶ Cohesion Technologies,
Palo Alto, California 94303
The transcription of type I collagen genes is
tightly regulated, but few cis-acting elements have been identified
that can modulate the levels of expression of these genes. Generation
of transgenic mice harboring various segments of the mouse pro- 1(I) collagen promoter led us to suspect that a repressor element was located between 10.5 and 17 kilobase pairs. Stable and
transient transfection experiments in ROS17/2.8 osteoblastic cells
confirmed the existence of such a repressor element at about 14
kilobase pairs and showed that it consisted in an almost perfect
three-time repeat of a 41-base pair sequence. This element, which we
named COIN-1, contains three E2-boxes, and a point mutation in at least two of them completely abolished its repressor effect. In gel shift
assays, COIN-1 bound a DNA-binding protein named EF1/ZEB-1, and
mutations that abolished the repressor effect of COIN-1 also suppressed
the binding of EF1. We also showed that the repressor effect of
COIN-1 was not mediated by chromatin compaction. Furthermore, overexpression of EF1 in ROS17/2.8 osteoblastic cells enhanced the
inhibitory effect of COIN-1 in a dose-dependent manner and repressed the expression of the pro- 1(I) collagen gene. Thus, EF1
appears to repress the expression of the mouse pro- 1(I) collagen
gene, through its binding to COIN-1.
*
This work was supported by grants from the Association pour
la Recherche sur le Cancer (to J. R.) and from the University of Paris
(to J. R.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
§
Recipient of a fellowship from the Ministère de l'Education,
de la recherche, et de la Technologie.
To whom correspondence should be addressed: INSERM U489,
Hôpital TENON, 4 rue de la Chine, 75020 Paris, France. Tel.:
33-1-56-01-69-93; Fax: 33-1-56-01-69-99; E-mail:
jerome.rossert@tnn.ap-hop-paris.fr.
Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2001 by the American Society for Biochemistry and Molecular Biology.
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