Various sigma (a) ligands including (+)-pentazocine stimulated [S-35]GTP ga
mma S binding in synaptic membranes from the mouse cerebellum. The (+)-pent
azocine-stimulated [S-35]GTP gamma S binding was blocked by the treatment o
f membranes with pertussis toxin (PTX), but completely recovered by the rec
onstitution of PTX-treated membranes with recombinant G(11), but not with G
(oA) These findings suggest that metabotropic a receptors are selectively c
oupled to G(11) protein. (C) 1999 Published by Elsevier Science Ireland Ltd
. All rights reserved.