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A transcriptional inhibitor targeted by the atypical orphan nuclear receptor SHP
Author(s) -
Båvner Ann,
Johansson Lotta,
Toresson Gudrun,
Gustafsson JanÅke,
Treuter Eckardt
Publication year - 2002
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1093/embo-reports/kvf087
Subject(s) - coactivator , nuclear receptor coactivator 1 , nuclear receptor , psychological repression , small heterodimer partner , transcription factor , biology , microbiology and biotechnology , neuron derived orphan receptor 1 , orphan receptor , nuclear localization sequence , genetics , gene , gene expression
SHP (short heterodimer partner, NROB2) is an atypical orphan member of the mammalian nuclear receptor family that consists only of a putative ligand‐binding domain and thus cannot bind DNA. Instead, SHP acts as a transcriptional coregulator by inhibiting the activity of various nuclear receptors (downstream targets) via occupation of the coactivator‐binding surface and active repression. However, repression mechanisms have remained elusive and may involve coinhibitory factors (upstream targets) distinct from known nuclear receptor corepressors. Here, we describe the isolation of mouse E1A‐like inhibitor of differentiation 1 (EID1) as a candidate coinhibitor for SHP. We characterize the interactions between SHP and EID1 and identify two repression‐defective SHP mutations that have lost the ability to bind EID1. We suggest histone acetyltransferases and histones as targets for EID1 action and propose that SHP inhibition of transcription involves EID1 antagonism of CBP/p300‐dependent coactivator functions.