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J. Biol. Chem., Vol. 277, Issue 29, 26468-26478, July 19, 2002
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From the The ubiquitin-protein ligase EDD encodes an
orthologue of the hyperplastic discs tumor suppressor gene,
which has a critical role in Drosophila development.
Frequent allelic imbalance at the EDD chromosomal locus in human
cancers suggests a role in tumorigenesis. In addition to a HECT
(homologous to E6-AP carboxyl terminus) domain, the EDD protein contains a UBR1 zinc
finger motif and ubiquitin-associated domain, each of which indicates involvement in ubiquitinylation pathways. This study shows that EDD
interacts with importin
EDD, the Human Hyperplastic Discs Protein, Has a Role in
Progesterone Receptor Coactivation and Potential Involvement in DNA
Damage Response*
,
,
,
,
,
,
, and
Cancer Research Program, Garvan Institute of
Medical Research, St Vincent's Hospital, 384 Victoria Street,
Darlinghurst, New South Wales 2010, the § John Curtin School
of Medical Research, Australian National University, P. O. Box 334,
Canberra, Australian Capital Territory 2601, and the ¶ Department
of Biochemistry & Molecular Biology, Monash University, Box 13D,
Clayton, Victoria 3800, Australia
5 through consensus basic nuclear localization signals and is localized in cell nuclei. EDD also binds
progesterone receptor (PR) and potentiates progestin-mediated gene
transactivation. This activity is comparable with that of the
coactivator SRC-1, but, in contrast, the interaction between EDD and PR
does not appear to involve an LXXLL receptor-binding motif.
EDD also binds calcium- and integrin-binding
protein/DNA-dependent protein kinase-interacting protein, a
potential target of ubiquitin-mediated proteolysis, and an altered
association is found between EDD and calcium- and integrin-binding
protein/DNA-dependent protein kinase-interacting protein in
response to DNA damage. The data presented here demonstrate a
role for EDD in PR signaling but also suggest a link to cancer through
DNA damage response pathways.
*
This work was supported by the National Health and Medical
Research Council of Australia, United States Army Medical Research and
Materiel Command Breast Cancer Research Program Grants DAMD17-98-1-8335 and DAMD17-00-1-253, the Cancer Council New South Wales, the Leo and
Jenny Leukemia and Cancer Foundation, the Kathleen Cuningham Foundation, and the Association for International Cancer Research.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.
To whom correspondence should be addressed. Tel.:
61-2-92958331; Fax: 61-2-92958321; E-mail:
c.watts@garvan.org.au.
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