Crystal structure of a heterodimeric complex of RAR and RXR ligand-bindingdomains

The crystal structure of a heterodimer between the ligand-binding domains ( LBDs) of the human RAR alpha bound to a selective antagonist and the consti tutively active mouse RXR alpha F318A mutant shows that, pushed by a bulky extension of the ligand, RAR alpha helix H12 adopts an antagonist position. The unexpected presence of a fatty acid in the ligand-binding pocket of RX R alpha F318A is likely to account for its apparent "constitutivity." Speci fic conformational changes suggest the structural basis of pure and partial antagonism. The RAR-RXR heterodimer interface is similar to that observed in most nuclear receptor (NR) homodimers. A correlative analysis of 3D stru ctures and sequences provides a novel view on dimerization among members of the nuclear receptor superfamily.