FXXLF and WXXLF sequences mediate the NH2-terminal interaction with the ligand binding domain of the androgen receptor

Bin He, Jon A. Kemppainen, Elizabeth M. Wilson

Research output: Contribution to journalArticle

349 Scopus citations

Abstract

The nuclear receptor superfamily members of eukaryotic transcriptional regulators contain a highly conserved activation function 2 (AF2) in the hormone binding carboxyl-terminal domain and, for some, an additional activation function 1 in the NH2-terminal region which is not conserved. Recent biochemical and crystallographic studies revealed the molecular basis of AF2 is hormone-dependent recruitment of LXXLL motif-containing coactivators, including the p160 family, to a hydrophobic cleft in the ligand binding domain. Our previous studies demonstrated that AF2 in the androgen receptor (AR) binds only weakly to LXXLL motif-containing coactivators and instead mediates an androgen-dependent interaction with the AR NH2-terminal domain required for its physiological function. Here we demonstrate in a mammalian two-hybrid assay, glutathione S-transferase fusion protein binding studies, and functional assays that two predicted α-helical regions that are similar, but functionally distinct from the p160 coactivator interaction sequence, mediate the androgen-dependent, NH2- and carboxyl-terminal interaction. FXXLF in the AR NH2-terminal domain with the sequence 23FQNLF27 mediates interaction with AF2 and is the predominant androgen-dependent interaction site. This FXXLF sequence and a second NH2-terminal WXXLF sequence 433WHTLF437 interact with different regions of the ligand binding domain to stabilize the hormone-receptor complex and may compete with AF2 recruitment of LXXLL motif-containing coactivators. The results suggest a unique mechanism for AR-mediated transcriptional activation.

Original languageEnglish (US)
Pages (from-to)22986-22994
Number of pages9
JournalJournal of Biological Chemistry
Volume275
Issue number30
DOIs
StatePublished - Jul 28 2000

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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