Identification and function of coactivator of estrogen receptor: ERIAP



Estrogen receptor (ER), one member of nuclear hormone receptor (NR) family, is an estrogen-dependent transcriptional factor that plays an important role in development, progression and treatment of breast cancer. Transcriptional co-factors (co-activators and co-repressors) are critical for ER to transduce hormone and metabolic signaling to target genes. A number of functional and structural studies have elucidated the precise mechanisms of co-activator interaction with the ligand-inducible activation domain in ER via one and several LXXLL motifs (where X is any amino acid) known as NR-Box. By the yeast two-hybrid system we have identified a novel ER-α interacting protein ERIAP (Estrogen Receptor Interacting and Activating Protein) which contains two consensus LXXLL motifs. ERIAP associated with ER-α in a ligand-dependent manner, as demonstrated by in vivo immunoprecipitation and in vitro GST capture assays. The two NR boxes were essential for ERIAP interaction with ER-α. Furthermore, ERIAP specifically enhanced ligand-mediated ER-α transcriptional activity in a dose-dependent fasion and increased the expression of estrogen-responsive gene pS2. Thus, our present findings indicate that ERIAP funcions as a new coactivator for ER-α transcriptional activity, which may play an important role in development and progression of breast cancer.


estrogen receptor breast cancer new gene ERIAP 


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Copyright information

© Science in China Press 2003

Authors and Affiliations

  • Meng Qinghui 
    • 1
  • Zhou Lixin 
    • 2
  • Cao Jianping 
    • 3
  • Gao Bin 
    • 4
  • Shao Rongguang 
    • 5
  • Li Jiyou 
    • 2
  • Fan Saijun 
    • 1
    • 2
    • 3
    • 5
  1. 1.Laboratory of Molecular OncologyNorth Shore-Long Island Jewish Research InstituteNew YorkUSA
  2. 2.Department of Pathology, Beijing Cancer HospitalPeking UniversityBeijingChina
  3. 3.School of Radiology and Public HealthSuzhou UniversitySuzhouChina
  4. 4.Division on Liver Biology, Institute of Alcohol Abuse and AlcoholismNational Institutes of HealthMarylandUSA
  5. 5.Institute of Medicinal BiotechnologyChinese Academy of Medical SciencesBeijingChina

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