1XB7

X-ray structure of ERRalpha LBD in complex with a PGC-1alpha peptide at 2.5A resolution

Summary for 1XB7

• Entry DOI: 10.2210/pdb1xb7/pdb
• Descriptor: Steroid hormone receptor ERR1, Peroxisome proliferator activated receptor gamma coactivator 1 alpha, IODIDE ION, ... (4 entities in total)
• Functional Keywords: nuclear hormone receptor, ligand binding domain, three-layered alpha-helical sandwich, coactivator peptide, amphipathic alpha-helix, transcription
• Biological source: Homo sapiens (human); More
• Cellular location: Nucleus: P11474 Q9UBK2
• Total number of polymer chains: 2
• Total formula weight: 28553.69

Authors

Kallen, J.,Schlaeppi, J.M.,Bitsch, F.,Filipuzzi, I.,Schilb, A.,Riou, V.,Graham, A.,Strauss, A.,Geiser, M.,Fournier, B. (deposition date: 2004-08-30, release date: 2004-09-14, Last modification date: 2023-10-25)

Primary citation

Kallen, J.,Schlaeppi, J.M.,Bitsch, F.,Filipuzzi, I.,Schilb, A.,Riou, V.,Graham, A.,Strauss, A.,Geiser, M.,Fournier, B.
Evidence for Ligand-independent Transcriptional Activation of the Human Estrogen-related Receptor {alpha} (ERR{alpha}): CRYSTAL STRUCTURE OF ERR{alpha} LIGAND BINDING DOMAIN IN COMPLEX WITH PEROXISOME PROLIFERATOR-ACTIVATED RECEPTOR COACTIVATOR-1{alpha}
J.Biol.Chem., 279:49330-49337, 2004

PubMed Abstract: The crystal structure of the ligand binding domain (LBD) of the estrogen-related receptor alpha (ERRalpha, NR3B1) complexed with a coactivator peptide from peroxisome proliferator-activated receptor coactivator-1alpha (PGC-1alpha) reveals a transcriptionally active conformation in the absence of a ligand. This is the first x-ray structure of ERRalpha LBD, solved to a resolution of 2.5 A, and the first structure of a PGC-1alpha complex. The putative ligand binding pocket (LBP) of ERRalpha is almost completely occupied by side chains, in particular with the bulky side chain of Phe328 (corresponding to Ala272 in ERRgamma and Ala350 in estrogen receptor alpha). Therefore, a ligand of a size equivalent to more than approximately 4 carbon atoms could only bind in the LBP, if ERRalpha would undergo a major conformational change (in particular the ligand would displace H12 from its agonist position). The x-ray structure thus provides strong evidence for ligand-independent transcriptional activation by ERRalpha. The interactions of PGC-1alpha with ERRalpha also reveal for the first time the atomic details of how a coactivator peptide containing an inverted LXXLL motif (namely a LLXYL motif) binds to a LBD. In addition, we show that a PGC-1alpha peptide containing this nuclear box motif from the L3 site binds ERRalpha LBD with a higher affinity than a peptide containing a steroid receptor coactivator-1 motif and that the affinity is further enhanced when all three leucine-rich regions of PGC-1alpha are present.

PubMed: 15337744
DOI: 10.1074/jbc.M407999200

Experimental method

X-RAY DIFFRACTION (2.5 Å)