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J Biol Chem, Vol. 274, Issue 24, 17242-17248, June 11, 1999
From the fgf-3 shows a complex
spatial-temporal pattern of transcription during mouse development, and
the gene product appears to be an important intercellular signaling
molecule. Here we show that the major enhancer, which is obligatory for
transcription, is composed of three elements with different properties.
Both functional analyses in undifferentiated and differentiated F9 cells and characterization of DNA-protein complexes in
vitro have identified the sequence motifs GTGACT(C), ATTGT, and
GATA as the key transcription factor binding sites. The GTGACT(C)
motif, while not essential, is required for full enhancer activity.
However, binding at ATTGT is crucial for transcriptional activity and
is required for cooperative binding at the proximal GATA site. The GATA
binding site mediates the retinoic acid/dibutyryl cyclic AMP
stimulation of transcription and correlates with the binding of Gata-4
which is induced by retinoic acid in differentiating F9 cells. The
ATTGT and GATA motifs are inactive when placed separately on a minimal
thymidine kinase (TK) promoter, but together they act as a strong
retinoic acid-regulated enhancer. In undifferentiated F9 cells,
gata-4 expression stimulates the fgf-3
promoter, whereas in differentiated F9 cells already expressing
gata-4, no further increase in promoter activity was observed.
Retinoic Acid-regulated Expression of Fibroblast Growth
Factor 3 Requires the Interaction between a Novel Transcription Factor
and GATA-4
,
Department of Viral Oncology, Institute for
Virus Research, Kyoto University, Shogoin, Sakyo-ku, Kyoto
606-8507, Japan and the § Imperial Cancer Research Fund,
Lincoln's Inn Fields, London WC2A 3PX, United Kingdom
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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