Figure 4
A schematic of the orthosteric binding site comparing key residues of AcAChBP and corresponding amino acids in the nAChR α4(+)β2(−) heteromeric site. Loop F is out of the range of the ligands discussed in this work and has been omitted. Arg96 is included (see text). On the α4(+) side boxes for selected amino-acid positions are colored yellow to highlight strict conservation and gray where the sequence changes. On the β2(−) side the boxes are colored green. Three key positions implicated in the ion-channel response to ligand binding and that are discussed in the text are shown in light green. |