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-Structure paper
タイトル | Structure of an insect gustatory receptor. |
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ジャーナル・号・ページ | bioRxiv, Year 2023 |
掲載日 | 2023年12月19日 |
著者 | Heather M Frank / Sanket Walujkar / Richard M Walsh / Willem J Laursen / Douglas L Theobald / Paul A Garrity / Rachelle Gaudet / |
PubMed 要旨 | Gustatory Receptors (GRs) are critical for insect chemosensation and are potential targets for controlling pests and disease vectors. However, GR structures have not been experimentally determined. ...Gustatory Receptors (GRs) are critical for insect chemosensation and are potential targets for controlling pests and disease vectors. However, GR structures have not been experimentally determined. We present structures of Gr9 (BmGr9), a fructose-gated cation channel, in agonist-free and fructose-bound states. BmGr9 forms a tetramer similar to distantly related insect Olfactory Receptors (ORs). Upon fructose binding, BmGr9's ion channel gate opens through helix S7b movements. In contrast to ORs, BmGR9's ligand-binding pocket, shaped by a kinked helix S4 and a shorter extracellular S3-S4 loop, is larger and solvent accessible in both agonist-free and fructose-bound states. Also unlike ORs, fructose binding by BmGr9 involves helix S5 and a binding pocket lined with aromatic and polar residues. Structure-based sequence alignments reveal distinct patterns of ligand-binding pocket residue conservation in GR subfamilies associated with distinct ligand classes. These data provide insight into the molecular basis of GR ligand specificity and function. |
リンク | bioRxiv / PubMed:38187590 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.85 - 3.98 Å |
構造データ | EMDB-43129, PDB-8vc1: EMDB-43130, PDB-8vc2: |
化合物 | ChemComp-PSC: ChemComp-PC7: ChemComp-9Z9: |
由来 |
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キーワード | MEMBRANE PROTEIN / gustatory receptor / homotetramer / ligand-gated ion channel / seven transmembrane |