ジャーナル: Nat Struct Mol Biol / 年: 2020 タイトル: Cryo-EM structures of the ionotropic glutamate receptor GluD1 reveal a non-swapped architecture. 著者: Ananth Prasad Burada / Rajesh Vinnakota / Janesh Kumar / 要旨: Ionotropic orphan delta (GluD) receptors are not gated by glutamate or any other endogenous ligand but are grouped with ionotropic glutamate receptors (iGluRs) based on sequence similarity. GluD1 ...Ionotropic orphan delta (GluD) receptors are not gated by glutamate or any other endogenous ligand but are grouped with ionotropic glutamate receptors (iGluRs) based on sequence similarity. GluD1 receptors play critical roles in synaptogenesis and synapse maintenance and have been implicated in neuronal disorders, including schizophrenia, cognitive deficits, and cerebral ataxia. Here we report cryo-EM structures of the rat GluD1 receptor complexed with calcium and the ligand 7-chlorokynurenic acid (7-CKA), elucidating molecular architecture and principles of receptor assembly. The structures reveal a non-swapped architecture at the interface of the extracellular amino-terminal domain (ATD) and the ligand-binding domain (LBD). This finding is in contrast with structures of other families of iGluRs, where the dimer partners between the ATD and LBD layers are swapped. Our results demonstrate that principles of architecture and symmetry are not conserved between delta receptors and other iGluRs and provide a molecular blueprint for understanding the functions of the 'orphan' class of iGluRs.
The distance between Residue A LYS 527 and Residue A ILE 532 is 20.50 Angstrom. The distance ...The distance between Residue A LYS 527 and Residue A ILE 532 is 20.50 Angstrom. The distance between Residue B LYS 527 and Residue B ILE 532 is 22.35 Angstrom. The distance between Residue C LYS 527 and Residue C ILE 532 is 20.85 Angstrom.
Has protein modification
Y
配列の詳細
Thrombin recognition site
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法
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試料調製
構成要素
名称: GluD1 / タイプ: COMPLEX / 詳細: Recombinantly expressed protein / Entity ID: all / 由来: RECOMBINANT
分子量
値: 0.388 MDa / 実験値: YES
由来(天然)
生物種: Rattus norvegicus (ドブネズミ)
由来(組換発現)
生物種: Homo sapiens (ヒト) / 細胞: HEK293S GnTI- / プラスミド: pEG Bac Mam