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J. Biol. Chem., Vol. 275, Issue 37, 28363-28370, September 15, 2000
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From the Ontario Cancer Institute and Department of Medical
Biophysics, University of Toronto, Toronto,
Ontario M5G 2M9, Canada
Members of the ETS family of transcription
factors are involved in several developmental and physiological
processes, and, when overexpressed or misexpressed, can contribute to a
variety of cancers. Each family member has a conserved DNA-binding
domain that recognizes DNA sequences containing a G-G-A trinucleotide. Discrimination between potential ETS-binding sites appears to be
governed by both the nucleotides flanking the G-G-A sequence and
protein-protein interactions. We have used an adaptation of the
"length-encoded multiplex" approach (Desjarlais, J. R., and Berg, J. M. (1994) Proc. Natl. Acad. Sci. U. S. A.
91, 11099-11103) to define DNA binding specificities for four ETS
proteins: Fli-1, SAP-1, PU.1, and TEL. Our results support a model in
which cooperative effects among neighboring bases flanking the central
G-G-A site contribute to the formation of stable ETS/DNA complexes.
These results are consistent with a mechanism for specific DNA binding that is partially governed by an indirect read-out of the DNA sequence,
in which a sequence-specific DNA conformation is sensed or induced.
The on-line version of this article (available at
http://www.jbc.com) contains supplementary tables.
To whom correspondence should be addressed: Ontario Cancer Inst.
and Dept. of Medical Biophysics, University of Toronto, 610 University Ave., Toronto, ON M5G 2M9, Canada. Tel.: 416-946-2017; Fax: 416-946-6529; E-mail: carrow@uhnres.utoronto.ca.
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