Madeline Nieves-Cintrón, Daniel Caballero-Rivera, Walter I. Silva, Manuel F. Navedo, José A. Lasalde-Dominicci
The role of position L8′, located in transmembrane domain 1 of the neuronal nicotinic α3 subunit, was characterized by using two-electrode voltage clamp in Xenopus oocytes. Four amino acids (Ala, Ser, Phe, and Tyr) were inserted at this conserved position, and the mutant subunit was coexpressed with either wild-type β2 or β4 subunits. These substitutions led to significant alterations in the pharmacodynamic parameters of cholinergic agents, resulting in loss of function. Ala and Ser substitutions resulted in …
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