PMID- 10835357 OWN - NLM STAT- MEDLINE DCOM- 20000720 LR - 20240314 IS - 0261-4189 (Print) IS - 1460-2075 (Electronic) IS - 0261-4189 (Linking) VI - 19 IP - 11 DP - 2000 Jun 1 TI - Crystal structure of the human RXRalpha ligand-binding domain bound to its natural ligand: 9-cis retinoic acid. PG - 2592-601 AB - The pleiotropic effects of active retinoids are transduced by their cognate nuclear receptors, retinoid X receptors (RXRs) and retinoic acid receptors (RARs), which act as transcriptional regulators activated by two stereoisomers of retinoic acid (RA): 9-cis RA (9-cRA) and all-trans RA (a-tRA). Among nuclear receptors, RXR occupies a central position and plays a crucial role in many intracellular signalling pathways as a ubiquitous heterodimerization partner with numerous other members of this superfamily. Whereas RARs bind both isomers, RXRs exclusively bind 9-cRA. The crystal structure of the ligand-binding domain (LBD) of human RXRalpha bound to 9-cRA reveals the molecular basis of this ligand selectivity and allows a comparison of both apo and holo forms of the same nuclear receptor. In the crystal, the receptor is monomeric and exhibits a canonical agonist conformation without direct contacts between the ligand and the transactivation helix H12. Comparison with the unliganded RXRalpha LBD structure reveals the molecular mechanisms of ligand-induced conformational changes and allows us to describe at the atomic level how these changes generate the proper protein interface involved in nuclear receptor-coactivator interaction. FAU - Egea, P F AU - Egea PF AD - Institut de Genetique et de Biologie Moleculaire et Cellulaire, CNRS/INSERM/ULP/College de France, BP 163-67404 Illkirch Cedex, CU de Strasbourg, France. FAU - Mitschler, A AU - Mitschler A FAU - Rochel, N AU - Rochel N FAU - Ruff, M AU - Ruff M FAU - Chambon, P AU - Chambon P FAU - Moras, D AU - Moras D LA - eng PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - EMBO J JT - The EMBO journal JID - 8208664 RN - 0 (Apoproteins) RN - 0 (Ligands) RN - 0 (Macromolecular Substances) RN - 0 (Peptide Fragments) RN - 0 (Receptors, Retinoic Acid) RN - 0 (Recombinant Fusion Proteins) RN - 0 (Retinoid X Receptors) RN - 0 (Transcription Factors) RN - 1UA8E65KDZ (Alitretinoin) RN - 5688UTC01R (Tretinoin) SB - IM MH - Alitretinoin MH - Apoproteins/chemistry/metabolism MH - Binding Sites MH - Crystallization MH - Crystallography, X-Ray MH - Humans MH - Ligands MH - Macromolecular Substances MH - Models, Molecular MH - Peptide Fragments/chemistry/metabolism MH - Protein Binding MH - Protein Conformation MH - Receptors, Retinoic Acid/*chemistry/genetics/metabolism MH - Recombinant Fusion Proteins/chemistry/metabolism MH - Retinoid X Receptors MH - Stereoisomerism MH - Transcription Factors/*chemistry/genetics/metabolism MH - Transcriptional Activation MH - Tretinoin/*metabolism PMC - PMC212755 EDAT- 2000/06/03 09:00 MHDA- 2000/07/25 11:00 PMCR- 2001/06/01 CRDT- 2000/06/03 09:00 PHST- 2000/06/03 09:00 [pubmed] PHST- 2000/07/25 11:00 [medline] PHST- 2000/06/03 09:00 [entrez] PHST- 2001/06/01 00:00 [pmc-release] AID - cdd254 [pii] AID - 10.1093/emboj/19.11.2592 [doi] PST - ppublish SO - EMBO J. 2000 Jun 1;19(11):2592-601. doi: 10.1093/emboj/19.11.2592.