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• W1979598272 abstract "The functional serotonin 5-HT type-3 (5-HT3) receptor, the target of many neuroactive drugs, is known to be a pseudo-symmetric pentamer made either of five identical subunits A (homomeric 5-HT3 A -R) or of subunits A and B (heteromeric 5-HT3 A/B -R) in a still debated arrangement. The serotonin binding site is located in the extracellular region, at the interface between two monomers, called the principal and the complementary subunits. The results of molecular dynamics simulations and computational alanine scanning mutagenesis studies applied here to the homomeric human 5-HT3 A -R disclose an aromatic “hot” cluster in the centre of the interface formed by residues W178 (principal subunit), Y68, Y83, W85 and Y148 (complementary subunit). Moreover, investigation of the coupling of agonist/antagonist binding to channel activation/inactivation points out the presence of two putative functional pathways at the subunit interface: W116-H180-L179-W178-E124-F125 (principal subunit) and Y136-Y138-Y148-W85-(P150) (complementary subunit), where W178 and Y148 appear to be critical residues for the binding/activation mechanism. Finally, direct comparison of the main features shown by the AA interface in the human 5-HT3 A -R with those of the BB interface in the homopentameric human 5-HT3 B -R provides interesting clues about the possible reasons that cause the 5-HT3 B -R not to be functional. An animated Interactive 3D Complement (I3DC) is available in Proteopedia at http://proteopedia.org/w/Journal:JBSD:16" @default.
• W1979598272 created "2016-06-24" @default.
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• W1979598272 date "2012-07-01" @default.
• W1979598272 modified "2023-09-27" @default.
• W1979598272 title "The extracellular subunit interface of the 5-HT3receptors: a computational alanine scanning mutagenesis study" @default.
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• W1979598272 doi "https://doi.org/10.1080/07391102.2012.680029" @default.
• W1979598272 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22694192" @default.
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