...arePharmacologically Selective Actuator Modules (PSAMs, pronounced SAMs). PSAMs are engineered α7 nicotinic acetylcholine...varenicline. This PSAM carries mutations at L131G, Q139L, and Y217F and is termed PSAM4 (or PSAM 4 ). Additional...signaling. PSAM-based LGICs can be classified by the ion pore domain they are coupled to: PSAM-Gly PSAM-Gly ...and inhibits neuronal activity. PSAM-5HT3 PSAM-5HT3 LGICs pair a PSAM domain with a 5-HT 3 serotonin receptor...cognate PSEM. For example, PSAM Q79G,Q139G is activated by PSEM 22S , while PSAM L141F,Y115F is activated... effort to develop a PSAM that responded to a clinically approved drug, the PSAM domain was engineered...have also been developed as agonists for PSAM4. A given PSAM is coupled with an ion pore domain (IPD) ...