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- W119276586 abstract "We previously reported that sarpogrelate, a selective 5-HT2A antagonist, showed a potent inverse agonist activity to constitutively active mutant (C322K) of human 5-HT2A receptor (5-HT2AR). However, it remains to be unknown about the actual mechanism of this mutant for its constitutive activation as well as inverse agonist activity of sarpogrelate. Our model shows that mutation (C322K) of 5-HT2AR causes electronic repulsion between positively charged Arg173(3.50) and Lys322(6.34) residues resulting outward movement of the C-terminus of transmembrane helix (TMH) III. This motion of TMH III leads to a partially active structure of the receptor, which may be a key step in receptor activation. The structural model of the partially active receptor also indicates that the binding of sarpogrelate to the constitutively active receptor causes an inward swing of TMH III to an inactive receptor structure. Therefore, the present study may suggest that the electronic repulsion causing outward movement of the C-terminus of TMH III may be the key step for constitutive activation of mutant C322K of 5-HT2AR and the inward movement of TMH III causes the inverse agonist activity of sarpogrelate." @default.
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- W119276586 date "2012-01-01" @default.
- W119276586 modified "2023-09-25" @default.
- W119276586 title "Mechanism of Inverse Agonist Action of Sarpogrelate at the Constitutively Active Mutant of Human 5-HT<sub>2A</sub> Receptor Revealed by Molecular Modeling" @default.
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- W119276586 doi "https://doi.org/10.1248/bpb.b12-00401" @default.
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