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Molecular and Cellular Biology, February 2000, p. 900-911, Vol. 20, No. 3
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
The Homeodomain of PDX-1 Mediates Multiple Protein-Protein
Interactions in the Formation of a Transcriptional Activation
Complex on the Insulin Promoter
Kinuko
Ohneda,1,
Raghavendra G.
Mirmira,1,2
Juehu
Wang,1
Jeffrey D.
Johnson,1,
and
Michael S.
German1,2,*
Hormone Research
Institute1 and Department of
Medicine,2 University of California, San
Francisco, San Francisco, California
Received 26 July 1999/Returned for modification 1 September
1999/Accepted 5 November 1999
Activation of insulin gene transcription specifically in the
pancreatic
cells depends on multiple nuclear proteins that interact
with each other and with sequences on the insulin gene promoter to
build a transcriptional activation complex. The homeodomain protein
PDX-1 exemplifies such interactions by binding to the A3/4 region of
the rat insulin I promoter and activating insulin gene transcription by
cooperating with the basic-helix-loop-helix (bHLH) protein E47/Pan1,
which binds to the adjacent E2 site. The present study provides
evidence that the homeodomain of PDX-1 acts as a protein-protein
interaction domain to recruit multiple proteins, including E47/Pan1,
BETA2/NeuroD1, and high-mobility group protein I(Y), to an activation
complex on the E2A3/4 minienhancer. The transcriptional activity of
this complex results from the clustering of multiple activation domains
capable of interacting with coactivators and the basal transcriptional
machinery. These interactions are not common to all homeodomain
proteins: the LIM homeodomain protein Lmx1.1 can also activate the
E2A3/4 minienhancer in cooperation with E47/Pan1 but does so through
different interactions. Cooperation between Lmx1.1 and E47/Pan1 results
not only in the aggregation of multiple activation domains but also in
the unmasking of a potent activation domain on E47/Pan1 that is
normally silent in non-
cells. While more than one activation
complex may be capable of activating insulin gene transcription through
the E2A3/4 minienhancer, each is dependent on multiple specific
interactions among a unique set of nuclear proteins.
*
Corresponding author. Mailing address: Hormone Research
Institute, University of California, San Francisco, 513 Parnassus Ave.,
San Francisco, CA 94143-0534. Phone: (415) 476-9262. Fax: (415)
731-3612. E-mail: mgerman{at}biochem.ucsf.edu.

Present address: Department of Cell Differentiation, Institute of
Embryology and Genetics, Kumamoto University School of Medicine,
Kumamoto City,
Japan.

Present address: Metabolex Corporation, Hayward,
Calif.
Molecular and Cellular Biology, February 2000, p. 900-911, Vol. 20, No. 3
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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