Download MendeleyThe Molecular Mechanisms of Coactivator Utilization in Ligand-dependent Transactivation by the Androgen Receptor.
Estebanez-Perpina, E., Moore, J.M.R., Mar, E., Delgado-Rodrigues, E., Nguyen, P., Baxter, J.D., Buehrer, B.M., Webb, P., Fletterick, R.J., Guy, R.K.(2005) J Biological Chem 280: 8060-8068
- PubMed: 15563469
- DOI: https://doi.org/10.1074/jbc.M407046200
- Primary Citation of Related Structures:
1T5Z, 1T63, 1T65, 1XJ7 - PubMed Abstract:
Androgens drive sex differentiation, bone and muscle development, and promote growth of hormone-dependent cancers by binding the nuclear androgen receptor (AR), which recruits coactivators to responsive genes. Most nuclear receptors recruit steroid receptor coactivators (SRCs) to their ligand binding domain (LBD) using a leucine-rich motif (LXXLL). AR is believed to recruit unique coactivators to its LBD using an aromatic-rich motif (FXXLF) while recruiting SRCs to its N-terminal domain (NTD) through an alternate mechanism. Here, we report that the AR-LBD interacts with both FXXLF motifs and a subset of LXXLL motifs and that contacts with these LXXLL motifs are both necessary and sufficient for SRC-mediated AR regulation of transcription. Crystal structures of the activated AR in complex with both recruitment motifs reveal that side chains unique to the AR-LBD rearrange to bind either the bulky FXXLF motifs or the more compact LXXLL motifs and that AR utilizes subsidiary contacts with LXXLL flanking sequences to discriminate between LXXLL motifs.
- Department of Biochemistry and Biophysics, University of California, San Francisco, California 94143, USA.
Organizational Affiliation:
