Two sets of chimeras between alphaxalone-sensitive GABA(A) receptor al
pha(2) or beta(1) subunits and the alphaxalone-insensitive glycine rec
eptor alpha(1) subunit were constructed to determine the structural do
mains important for the modulatory actions of neuroactive steroids. Th
ese data suggest that the site of action for neurosteroids on GABA(A)
receptors is not the same as that for volatile anesthetics and ethanol
, but is on the N-terminal side of the middle of TM2. (C) 1998 Rapid S
cience Ltd.