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-Structure paper
タイトル | Cryo-EM structure of type 1 IPR channel in a lipid bilayer. |
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ジャーナル・号・ページ | Commun Biol, Vol. 4, Issue 1, Page 625, Year 2021 |
掲載日 | 2021年5月25日 |
著者 | Mariah R Baker / Guizhen Fan / Alexander B Seryshev / Melina A Agosto / Matthew L Baker / Irina I Serysheva / |
PubMed 要旨 | Type 1 inositol 1,4,5-trisphosphate receptor (IPR1) is the predominant Ca-release channel in neurons. IPR1 mediates Ca release from the endoplasmic reticulum into the cytosol and thereby is involved ...Type 1 inositol 1,4,5-trisphosphate receptor (IPR1) is the predominant Ca-release channel in neurons. IPR1 mediates Ca release from the endoplasmic reticulum into the cytosol and thereby is involved in many physiological processes. Here, we present the cryo-EM structures of full-length rat IPR1 reconstituted in lipid nanodisc and detergent solubilized in the presence of phosphatidylcholine determined in ligand-free, closed states by single-particle electron cryo-microscopy. Notably, both structures exhibit the well-established IPR1 protein fold and reveal a nearly complete representation of lipids with similar locations of ordered lipids bound to the transmembrane domains. The lipid-bound structures show improved features that enabled us to unambiguously build atomic models of IPR1 including two membrane associated helices that were not previously resolved in the TM region. Our findings suggest conserved locations of protein-bound lipids among homotetrameric ion channels that are critical for their structural and functional integrity despite the diversity of structural mechanisms for their gating. |
リンク | Commun Biol / PubMed:34035440 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.96 - 3.3 Å |
構造データ | EMDB-23337, PDB-7lhe: EMDB-23338, PDB-7lhf: |
化合物 | ChemComp-PLX: ChemComp-ZN: |
由来 |
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キーワード | MEMBRANE PROTEIN / Calcium channel / lipid nanodisc / lipids |