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. 2021 Dec 1;7(49):eabl3857. doi: 10.1126/sciadv.abl3857

Fig. 2. 5-HT binds to central and allosteric sites.

Fig. 2.

(A and B) 5-HT interactions within the central binding site for the outward (A) and occluded (B) conformations. Hydrogen bonds formed between 5-HT and D98 and T439 are indicated with dark blue dashed lines. (C) Chemical structures of 5-HT and methyl analogs, with the methyl groups circled. (D) Comparison of 5-HT binding pose and interactions with surrounding residues in the allosteric site in the outward (purple) and occluded (gray) conformations. (E) Comparison of 5-HT binding in the allosteric site with S-citalopram binding in the extracellular vestibule (PDB code: 5I73, gray). (F) Plots of competition binding of 5-HT (black circles) and the N-indole methyl derivative (orange squares) against [3H]VLZ in NaCl. Data are means ± SEM.