Mammalian α1-adrenergic receptor. Purification and characterization of the native receptor ligand binding subunit
α1-Adrenergic receptors from the cultured smooth muscle cell line (DDT1 MF-2) have been solubilized with digitonin and purified to apparent homogeneity by sequential chromatography on a biospecific affinity support (Sepharose-A55453 (4-amino-6,7-dimethoxy-2-[4-[5-(4-amino-3-phenyl)pentanoyl]- 1-piperazinyl]-quinazoline), an α1 receptor-selective antagonist), a wheat germ agglutinin-agarose gel, an
