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Molecular and Cellular Biology, February 1999, p. 1182-1189, Vol. 19, No. 2
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
The Angelman Syndrome-Associated Protein, E6-AP, Is a Coactivator
for the Nuclear Hormone Receptor Superfamily
Zafar
Nawaz,1
David M.
Lonard,1
Carolyn L.
Smith,1
Efrat
Lev-Lehman,2
Sophia Y.
Tsai,1
Ming-Jer
Tsai,1 and
Bert W.
O'Malley1,*
Department of Cell
Biology1 and
Department of Molecular and
Human Genetics,2 Baylor College of Medicine,
Houston, Texas 77030
Received 6 August 1998/Returned for modification 9 September
1998/Accepted 27 October 1998
In this study, we found that the E6-associated protein
(E6-AP/UBE3A) directly interacts with and coactivates the
transcriptional activity of the human progesterone receptor (PR) in a
hormone-dependent manner. E6-AP also coactivates the hormone-dependent
transcriptional activities of the other members of the nuclear hormone
receptor superfamily. Previously, it was shown that E6-AP serves the
role of a ubiquitin-protein ligase (E3) in the presence of the E6
protein from human papillomavirus types 16 and 18. Our data show that the ubiquitin-protein ligase function of E6-AP is dispensable for its
ability to coactivate nuclear hormone receptors, showing that E6-AP
possesses two separable independent functions, as both a coactivator
and a ubiquitin-protein ligase. Disruption of the maternal copy of
E6-AP is correlated with Angelman syndrome (AS), a genetic
neurological disorder characterized by severe mental retardation,
seizures, speech impairment, and other symptoms. However, the exact
mechanism by which the defective E6-AP gene causes AS remains unknown.
To correlate the E6-AP coactivator function and ubiquitin-protein
ligase functions with the AS phenotype, we expressed mutant forms of
E6-AP isolated from AS patients and assessed the ability of each of
these mutant proteins to coactivate PR or provide ubiquitin-protein
ligase activity. This analysis revealed that in the majority of
the AS patients examined, the ubiquitin-protein ligase function of
E6-AP was defective whereas the coactivator function was intact. This
finding suggests that the AS phenotype results from a defect in the
ubiquitin-proteosome protein degradation pathway.
*
Corresponding author. Mailing address: Department of
Cell Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX
77030. Phone: (713) 798-6205. Fax: (713) 798-5599. E-mail: berto{at}bcm.tmc.edu.
Molecular and Cellular Biology, February 1999, p. 1182-1189, Vol. 19, No. 2
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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