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Heterodimeric complex of RAR and RXR nuclear receptor ligand-binding domains: purification, crystallization, and
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP/Collège de France, Illkirch cedex, C. U. de Strasbourg, 67404, France.
Abstract:
Both the human retinoic acid receptor alpha (hRARalpha) and a constitutively active mutant (F318A) of the mouse retinoid X receptor alpha (mRXR alpha F318A) ligand-binding domains were separately overexpressed in Escherichia coli, copurified as a heterodimer in a two-step procedure, and cocrystallized with an RAR alpha-specific antagonist by using polyethylene glycol 10,000 as precipitant. The crystals grew in the hexagonal space group P6(1)22 displaying the unit cell parameters a = b = 116.6 A and c = 207.8 A. They diffracted X-ray to a limit of 2.2-A resolution. The asymmetric unit comprises one heterodimer and the crystal contains 60% solvent. The structure was determined by molecular replacement and is currently being refined.