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(Received for publication, July 12, 1996, and in revised form, September 12, 1996)
From the ¶ Eppley Institute for Research in Cancer and
Allied Diseases, Transforming growth factor-
Volume 271, Number 50,
Issue of December 13, 1996
pp. 32375-32380
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
2 Gene Is
Dependent on an E-box Located between an Essential cAMP Response
Element/Activating Transcription Factor Motif and the TATA Box of the
Gene
,
and
Department of Pathology and Microbiology,
University of Nebraska Medical Center, Omaha, Nebraska 68198-6805
2 (TGF-
2) is an
important regulator of cell proliferation and differentiation; however,
its transcriptional regulation is not well understood. Here we report
characterization of an essential E-box motif, positioned at
50/
45
between a previously described functional cAMP response
element/activating transcription factor site and the TATA box of the
human TGF-
2 promoter. By site-directed mutagenesis, we demonstrate
that this E-box motif is necessary for the promoter activity, not only
in differentiated cells derived from embryonal carcinoma cells, but
also in choriocarcinoma cells and in MCF-7 breast carcinoma cells. We
also demonstrate that the transcription factors USF1 and USF2 bind to
this E-box motif in vitro when nuclear extracts from each
of these cell lines are examined by gel retardation assays. Moreover,
using a dominant-negative USF2 protein, we show that USF proteins are
critical for TGF-
2 promoter activity in vivo. The
importance of the E-box motif described in this study is supported by
the presence of an E-box motif in the same position in the chicken
TGF-
2 gene promoter.
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