title: Target size of the adenosine Ri receptor.
abstract: The adenosine receptor of rat cerebral-cortical membranes was examined by radiation inactivation. In control membranes the receptor is distributed between high- and low-affinity states, that can be preferentially expressed by Mg2+ ions and guanine nucleotides respectively. Upon exposure to increasing doses of radiation, the high-affinity receptor decayed linearly as a function of radiation dose. This decay rate corresponded to a target size of 63,000 Da, when compared with the decay of the muscarinic cholinergic receptor that was also measured in these membranes.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D002540:Cerebral Cortex / Q000378:metabolism*; D004307:Dose-Response Relationship, Radiation; D006160:Guanosine Triphosphate / Q000378:metabolism; D008274:Magnesium / Q000378:metabolism; D008297:Male; D008970:Molecular Weight; D051381:Rats; D011919:Rats, Inbred Strains; D011956:Receptors, Cell Surface / Q000378:metabolism / Q000528:radiation effects*; D011983:Receptors, Purinergic
chemical_list: D011956:Receptors, Cell Surface; D011983:Receptors, Purinergic; D006160:Guanosine Triphosphate; D008274:Magnesium