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- W2045950997 abstract "Thromboxane A(2) receptor (TP receptor), a prostanoid receptor, belongs to the G protein-coupled receptor family, composed of three intracellular loops and three extracellular loops connecting seven transmembrane helices. The highly conserved extracellular domains of the prostanoid receptors were found in the second extracellular loop (eLP(2)), which was proposed to be involved in ligand recognition. The 3D structure of the eLP(2) would help to further explain the ligand binding mechanism. Analysis of the human TP receptor model generated from molecular modeling based on bacteriorhodopsin crystallographic structure indicated that about 12-14 A separates the N- and C-termini of the extra- and intracellular loops. Synthetic loop peptides whose termini are constrained to this separation are presumably more likely to mimic the native loop structure than the corresponding loop region peptide with unrestricted ends. To test this new concept, a peptide corresponding to the eLP(2) (residues 173-193) of the TP receptor has been made with the N- and C-termini connected by a homocysteine disulfide bond. Through 2D nuclear magnetic resonance (NMR) experiments, complete (1)H NMR assignments, and structural construction, the overall 3D structure of the peptide was determined. The structure shows two beta-turns at residues 180 and 185. The distance between the N- and C-termini of the peptide shown in the NMR structure is 14.2 A, which matched the distance (14.5 A) between the two transmembrane helices connecting the eLP(2) in the TP receptor model. This suggests that the approach using the constrained loop peptides greatly increases the likelihood of solving the whole 3D structures of the extra- and the intracellular domains of the TP receptor. This approach may also be useful in structural studies of the extramembrane loops of other G protein-coupled receptors." @default.
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- W2045950997 date "2000-12-07" @default.
- W2045950997 modified "2023-09-27" @default.
- W2045950997 title "Solution Structure of the Second Extracellular Loop of Human Thromboxane A<sub>2</sub> Receptor" @default.
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- W2045950997 doi "https://doi.org/10.1021/bi001867c" @default.
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