Structure of the intact PPAR-gamma-RXR- nuclear receptor complex on DNA.
Structure of the intact PPAR-gamma-RXR- nuclear receptor complex on DNA.
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DOI:
10.1038/nature07413
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发表时间:
2008-11-20
期刊:
影响因子:
64.8
通讯作者:
Rastinejad, Fraydoon
中科院分区:
文献类型:
--
作者:
Chandra, Vikas;Huang, Pengxiang;Hamuro, Yoshitomo;Raghuram, Srilatha;Wang, Yongjun;Burris, Thomas P.;Rastinejad, Fraydoon
Nuclear receptors are multi-domain transcription factors that bind to DNA elements from which they regulate gene expression. The peroxisome proliferator-activated receptors (PPARs) form heterodimers with the retinoid X receptor (RXR), and PPAR-γ has been intensively studied as a drug target because of its link to insulin sensitization. Previous structural studies have focused on isolated DNA or ligand-binding segments, with no demonstration of how multiple domains cooperate to modulate receptor properties. Here we present structures of intact PPAR-γ and RXR-α as a heterodimer bound to DNA, ligands and coactivator peptides. PPAR-γ and RXR-α form a non-symmetric complex, allowing the ligand-binding domain (LBD) of PPAR-γ to contact multiple domains in both proteins. Three interfaces link PPAR-γ and RXR-α, including some that are DNA dependent. The PPAR-γ LBD cooperates with both DNA-binding domains (DBDs) to enhance response-element binding. The A/B segments are highly dynamic, lacking folded substructures despite their gene-activation properties.
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