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- W172713232 abstract "The porcine ventricle cardiac beta-adrenergic receptor (..beta..AR) is predominantly of the ..beta../sub 2/ subtype. Sucrose density gradient purified porcine ventricle membranes exhibit a high ..beta..AR density of 1 pmol per mg and a K/sub d/ for /sup 125/I-iodocyanopindolol of 180 pM. Digitonin solubilized receptor exhibits ligand binding characteristics identical to those of membrane bound receptor. Stability studies indicate that the solubilized cardiac ..beta..AR has a t/sub 1/2/ of 92 hours. Solubilized receptor is stabilized by occupation with antagonists. Isoelectric focusing indicates a pI = 5.0, in agreement with results obtained for both ..beta../sub 1/AR and ..beta../sub 2/AR isolated from other sources. The cardiac ..beta../sub 1/AR has been purified to homogeneity by affinity chromatography and size exclusion HPLC (2 TSK 2000, 1 TSK 3000). Autoradiograms of purified, radioiodinated receptor preparations subjected to SDS-PAGE revealed a single band with an apparent subunit molecular mass (M/sub r/) of 68 kDa. This subunit M/sub r/ was confirmed in membranes photoaffinity labeled with /sup 125/I-iodocyanopindolol diazirine. A single band was specifically labeled, as evidenced by blocking of photoincorporation by (-) and (+) propranolol with typical ..beta..AR stereoselectivity." @default.
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- W172713232 date "1986-05-01" @default.
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- W172713232 title "Purification and molecular characterization of the cardiac beta-adrenergic receptor" @default.
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