Molecular cloning and characterization of CAPER, a novel coactivator of activating protein-1 and estrogen receptors

Dong Ju Jung, Soon Young Na, Doe Sun Na, Jae Woon Lee

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65 Scopus citations


Transcriptional coactivators either bridge transcription factors and the components of the basal transcription apparatus and/or remodel the chromatin structures. We isolated a novel nuclear protein based on its interaction with the recently described general coactivator activating signal cointegrator-2 (ASC-2). This protein CAPER (for coactivator of activating protein-1 (AP-1) and estrogen receptors (ERs)) selectively bound, among the many transcription factors we tested, the AP-1 component c-Jun and the estradiol-bound ligand binding domains of ERα and ERβ. Interestingly, CAPER exhibited a cryptic autonomous transactivation function that becomes activated only in the presence of estradiol-bound ER. In cotransfections, CAPER stimulated transactivation by ERα, ERβ, and AP-1. Thus, CAPER may represent a more selective transcriptional coactivator molecule that plays a pivotal role for the function of AP-1 and ERs in vivo in conjunction with the general coactivator ASC-2.

Original languageEnglish (US)
Pages (from-to)1229-1234
Number of pages6
JournalJournal of Biological Chemistry
Issue number2
StatePublished - Jan 11 2002


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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