Wheeler, Susan V., Chad, John E. and Foreman, Richard
Residues 1 to 80 of the N-terminal domain of the ? subunit confer neuronal bungarotoxin sensitivity and agonist selectivity on neuronal nicotinic receptors
Febs Letters, 332, (1-2), . (doi:10.1016/0014-5793(93)80500-T).
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Standard two electrode voltage clamp techniques were used to investigate the response of neuronal nicotinic acetylcholine receptors, expressed in Xenopus oocytes, to various agonists and neuronal bungarotoxin (NBT). The ? subunit is an important determinant of the receptor's pharmacological profile. Co-expression of ?4 and ?2 subunits produced a receptor that was relatively insensitive to cytisine and nicotine and inhibited by NBT, whilst the ?4?4 combination produced a receptor that was highly sensitive to cytisine and nicotine but resistant to toxin. The first 80 amino acids of the N-terminal domain of the ? subunit are implicated in these characteristics, since the combination of ?4 with a hybrid ? subunit comprising amino acids 1 ? 80 of ?2 and 81 ? 416 of ?4 became relatively insensitive to nicotine and cytisine and resistant to inhibition by neuronal bungarotoxin.
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