Solubilization of the muscarinic acetylcholine receptor by sodium cholate: Stabilization of the receptor by muscarinic ligands

TATSUYA HAGA, TOSHIHIDE NUKADA, KAZUKO HAGA
1982 Biomedical research  
Forty to fifty percent of the muscarinic receptor in membrane preparations of porcine caudate nucleus was solubilized by sodium cholate in its active form when the membranes were pretreated with carbamylcholine or other muscarinic ligands. The binding activity of solubilized receptors was assayed by using [3H]quinuclidinylbenzylate ([3H]QNB) after removal of cholate and carbamylcholine. Without the pretreatment, sodium cholate abolished most of the binding activity. The solubilized receptor had
more » ... a high afiinity for [3H]QNB with a dissociation constant of 58 pM and an affinity for muscarinic ligands similar to that of the membrane receptor.
doi:10.2220/biomedres.3.695 fatcat:sd5ncqe4a5hjvpmolxs5pyjdrq