title: Melanoma antigen gene protein-A11 (MAGE-11) F-box links the androgen receptor NH2-terminal transactivation domain to p160 coactivators.
abstract: Androgen-dependent transcriptional activity by the androgen receptor (AR) and its coregulators is required for male reproductive development and function. In humans and other primates, melanoma antigen gene protein-A11 (MAGE-11) is an AR selective coregulator that increases AR transcriptional activity. Here we show that the interaction between AR and MAGE-11 is mediated by AR NH(2)-terminal FXXLF motif binding to a highly conserved MAGE-11 F-box in the MAGE homology domain, and is modulated by serum stimulation of mitogen-activated protein kinase phosphorylation of MAGE-11 Ser-174. The MAGE-11-dependent increase in AR transcriptional activity is mediated by a direct interaction between MAGE-11 and transcriptional intermediary factor 2 (TIF2) through the NH(2)-terminal region of TIF2, and by a MAGE-11 FXXIF motif interaction with an F-box-like region in activation domain 1 of TIF2. The results suggest that MAGE-11 functions as a bridging factor to recruit AR coactivators through a novel FXX(L/I)F motif-F-box interaction paradigm.
authors.affiliation: Curriculum in Toxicology, University of North Carolina, Chapel Hill, North Carolina 27599-7500, USA.
authors.forename: Emily B
authors.initials: EB
authors.lastname: Askew
authors.forename: Suxia
authors.initials: S
authors.lastname: Bai
authors.forename: Andrew T
authors.initials: AT
authors.lastname: Hnat
authors.forename: John T
authors.initials: JT
authors.lastname: Minges
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Wilson
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics / Q000378:metabolism*; D019556:COS Cells; D002522:Chlorocebus aethiops; D044782:F-Box Motifs; D006801:Humans; D008297:Male; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D051958:Nuclear Receptor Coactivator 2 / Q000235:genetics / Q000378:metabolism*; D011471:Prostatic Neoplasms / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D011944:Receptors, Androgen / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D015533:Transcriptional Activation
chemical_list: D000951:Antigens, Neoplasm; C110882:MAGEA11 protein, human; C498001:NCOA2 protein, human; D009363:Neoplasm Proteins; D051958:Nuclear Receptor Coactivator 2; D034741:RNA, Small Interfering; D011944:Receptors, Androgen; D020928:Mitogen-Activated Protein Kinases