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Molecular and Cellular Biology, September 1999, p. 6085-6097, Vol. 19, No. 9
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
The Androgen Receptor Amino-Terminal Domain Plays a
Key Role in p160 Coactivator-Stimulated Gene Transcription
Philippe
Alen,1,
Frank
Claessens,1
Guido
Verhoeven,2
Wilfried
Rombauts,1 and
Ben
Peeters1,*
Division of
Biochemistry1 and Laboratory for
Experimental Medicine and Endocrinology,2
Faculty of Medicine, University of Leuven, B-3000 Leuven, Belgium
Received 31 March 1999/Returned for modification 5 May
1999/Accepted 11 May 1999
Steroid receptors are conditional transcription factors that, upon
binding to their response elements, regulate the expression of target
genes via direct protein interactions with transcriptional coactivators. We have analyzed the functional interactions between the
androgen receptor (AR) and 160-kDa nuclear receptor coactivators. Upon
overexpression in mammalian cells, these coactivators enhance the
transcriptional activity of both the amino-terminal domain (NTD) and
the ligand-binding domain (LBD) of the AR. The coactivator activity for
the LBD is strictly ligand-controlled and depends on the nature of the
DNA-binding domain to which it is fused. We demonstrate that the NTD
physically interacts with coactivators and with the LBD and that this
interaction, like the functional interaction between the LBD and p160
coactivators, relies on the activation function 2 (AF2) core domain.
The mutation of a highly conserved lysine residue in the predicted
helix 3 of the LBD (K720A), however, blunts the functional interaction
with coactivators but not with the NTD. Moreover, this mutation does
not affect the transcriptional activity of the full-size AR. A mutation
in the NTD of activation function AF1a (I182A/L183A), which
dramatically impairs the activity of the AR, has no effect on the
intrinsic transcriptional activity of the NTD but interferes with the
cooperation between the NTD and the LBD. Finally, p160 proteins in
which the three LXXLL motifs are mutated retain most of their
coactivator activity for the full-size AR, although they are no longer
functional for the isolated LBD. Together, these data suggest that in
the native AR the efficient recruitment of coactivators requires a functional association of the NTD with the LBD and that the binding of
coactivators occurs primarily through the NTD.
*
Corresponding author. Mailing address: Division of
Biochemistry, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven,
Belgium. Phone: 32 16 34 57 08. Fax: 32 16 34 59 95. E-mail:
Ben.Peeters{at}med.kuleuven.ac.be.

Present address: Laboratory for Molecular Oncology, Centre for
Human Genetics, University of Leuven, B-3000 Leuven,
Belgium.
Molecular and Cellular Biology, September 1999, p. 6085-6097, Vol. 19, No. 9
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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