TY - JOUR
T1 - Interaction of transcriptional intermediary factor 2 nuclear receptor box peptides with the coactivator binding site of estrogen receptor α
AU - Wärnmark, Anette
AU - Treuter, Eckardt
AU - Gustafsson, Jan Åke
AU - Hubbard, Roderick E.
AU - Brzozowski, Andrzej M.
AU - Pike, Ashley C.W.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/6/14
Y1 - 2002/6/14
N2 - The activation function 2/ligand-dependent interaction between nuclear receptors and their coregulators is mediated by a short consensus motif, the so-called nuclear receptor (NR) box. Nuclear receptors exhibit distinct preferences for such motifs depending both on the bound ligand and on the NR box sequence. To better understand the structural basis of motif recognition, we characterized the interaction between estrogen receptor α and the NR box regions of the p160 coactivator TIF2. We have determined the crystal structures of complexes between the ligand-binding domain of estrogen receptor α and 12-mer peptides from the Box 2 and Box 3 regions of TIF2. Surprisingly, the Box 3 module displays an unexpected binding mode that is distinct from the canonical LXXLL interaction observed in other ligand-binding domain/NR box crystal structures. The peptide is shifted along the coactivator binding site in such a way that the interaction motif becomes LXXYL rather than the classical LXXLL. However, analysis of the binding properties of wild type NR box peptides, as well as mutant peptides designed to probe the Box 3 orientation, suggests that the Box 3 peptide primarily adopts the "classical" LXXLL orientation in solution. These results highlight the potential difficulties in interpretation of protein-protein interactions based on cocrystal structures using short peptide motifs.
AB - The activation function 2/ligand-dependent interaction between nuclear receptors and their coregulators is mediated by a short consensus motif, the so-called nuclear receptor (NR) box. Nuclear receptors exhibit distinct preferences for such motifs depending both on the bound ligand and on the NR box sequence. To better understand the structural basis of motif recognition, we characterized the interaction between estrogen receptor α and the NR box regions of the p160 coactivator TIF2. We have determined the crystal structures of complexes between the ligand-binding domain of estrogen receptor α and 12-mer peptides from the Box 2 and Box 3 regions of TIF2. Surprisingly, the Box 3 module displays an unexpected binding mode that is distinct from the canonical LXXLL interaction observed in other ligand-binding domain/NR box crystal structures. The peptide is shifted along the coactivator binding site in such a way that the interaction motif becomes LXXYL rather than the classical LXXLL. However, analysis of the binding properties of wild type NR box peptides, as well as mutant peptides designed to probe the Box 3 orientation, suggests that the Box 3 peptide primarily adopts the "classical" LXXLL orientation in solution. These results highlight the potential difficulties in interpretation of protein-protein interactions based on cocrystal structures using short peptide motifs.
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U2 - 10.1074/jbc.M200764200
DO - 10.1074/jbc.M200764200
M3 - Article
C2 - 11937504
AN - SCOPUS:0037077233
SN - 0021-9258
VL - 277
SP - 21862
EP - 21868
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 24
ER -