+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 5cmm | ||||||
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タイトル | Crystal structure of the GluK2EM LBD dimer assembly complex with 2S,4R-4-methylglutamate | ||||||
要素 | Glutamate receptor ionotropic, kainate 2 | ||||||
キーワード | TRANSPORT PROTEIN / Membrane protein | ||||||
機能・相同性 | 機能・相同性情報 Activation of Na-permeable kainate receptors / mossy fiber rosette / detection of cold stimulus involved in thermoception / Activation of Na-permeable kainate receptors / kainate selective glutamate receptor complex / Activation of Ca-permeable Kainate Receptor / negative regulation of synaptic transmission, glutamatergic / regulation of short-term neuronal synaptic plasticity / inhibitory postsynaptic potential / glutamate receptor activity ...Activation of Na-permeable kainate receptors / mossy fiber rosette / detection of cold stimulus involved in thermoception / Activation of Na-permeable kainate receptors / kainate selective glutamate receptor complex / Activation of Ca-permeable Kainate Receptor / negative regulation of synaptic transmission, glutamatergic / regulation of short-term neuronal synaptic plasticity / inhibitory postsynaptic potential / glutamate receptor activity / ubiquitin conjugating enzyme binding / glutamate receptor signaling pathway / Activation of Ca-permeable Kainate Receptor / receptor clustering / modulation of excitatory postsynaptic potential / extracellularly glutamate-gated ion channel activity / regulation of JNK cascade / kainate selective glutamate receptor activity / ionotropic glutamate receptor complex / behavioral fear response / neuronal action potential / positive regulation of synaptic transmission / glutamate-gated receptor activity / glutamate-gated calcium ion channel activity / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / presynaptic modulation of chemical synaptic transmission / dendrite cytoplasm / hippocampal mossy fiber to CA3 synapse / regulation of membrane potential / SNARE binding / excitatory postsynaptic potential / synaptic transmission, glutamatergic / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / PDZ domain binding / postsynaptic density membrane / regulation of long-term neuronal synaptic plasticity / modulation of chemical synaptic transmission / terminal bouton / intracellular calcium ion homeostasis / positive regulation of neuron apoptotic process / presynaptic membrane / scaffold protein binding / chemical synaptic transmission / perikaryon / postsynaptic membrane / neuron apoptotic process / negative regulation of neuron apoptotic process / postsynaptic density / axon / neuronal cell body / glutamatergic synapse / dendrite / ubiquitin protein ligase binding / synapse / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | Rattus norvegicus (ドブネズミ) Homo sapiens (ヒト) | ||||||
手法 | X線回折 / シンクロトロン / 分子置換 / 解像度: 1.271 Å | ||||||
データ登録者 | Chittori, S. / Mayer, M.L. | ||||||
引用 | ジャーナル: Nature / 年: 2016 タイトル: Structural basis of kainate subtype glutamate receptor desensitization. 著者: Joel R Meyerson / Sagar Chittori / Alan Merk / Prashant Rao / Tae Hee Han / Mihaela Serpe / Mark L Mayer / Sriram Subramaniam / 要旨: Glutamate receptors are ligand-gated tetrameric ion channels that mediate synaptic transmission in the central nervous system. They are instrumental in vertebrate cognition and their dysfunction ...Glutamate receptors are ligand-gated tetrameric ion channels that mediate synaptic transmission in the central nervous system. They are instrumental in vertebrate cognition and their dysfunction underlies diverse diseases. In both the resting and desensitized states of AMPA and kainate receptor subtypes, the ion channels are closed, whereas the ligand-binding domains, which are physically coupled to the channels, adopt markedly different conformations. Without an atomic model for the desensitized state, it is not possible to address a central problem in receptor gating: how the resting and desensitized receptor states both display closed ion channels, although they have major differences in the quaternary structure of the ligand-binding domain. Here, by determining the structure of the kainate receptor GluK2 subtype in its desensitized state by cryo-electron microscopy (cryo-EM) at 3.8 Å resolution, we show that desensitization is characterized by the establishment of a ring-like structure in the ligand-binding domain layer of the receptor. Formation of this 'desensitization ring' is mediated by staggered helix contacts between adjacent subunits, which leads to a pseudo-four-fold symmetric arrangement of the ligand-binding domains, illustrating subtle changes in symmetry that are important for the gating mechanism. Disruption of the desensitization ring is probably the key switch that enables restoration of the receptor to its resting state, thereby completing the gating cycle. | ||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 5cmm.cif.gz | 172.3 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb5cmm.ent.gz | 140 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 5cmm.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 5cmm_validation.pdf.gz | 439.3 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 5cmm_full_validation.pdf.gz | 441.1 KB | 表示 | |
XML形式データ | 5cmm_validation.xml.gz | 16.2 KB | 表示 | |
CIF形式データ | 5cmm_validation.cif.gz | 25.3 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/cm/5cmm ftp://data.pdbj.org/pub/pdb/validation_reports/cm/5cmm | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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単位格子 |
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-要素
#1: タンパク質 | 分子量: 29356.621 Da / 分子数: 1 断片: UNP P42260 residues 429-544, UNP Q13002 residues 667-806 変異: A487T A658S N690S F704L,A487T A658S N690S F704L / 由来タイプ: 組換発現 由来: (組換発現) Rattus norvegicus (ドブネズミ), (組換発現) Homo sapiens (ヒト) 遺伝子: Grik2, Glur6, GRIK2, GLUR6 / プラスミド: PET22 / 発現宿主: Escherichia coli (大腸菌) / 株 (発現宿主): Origami B(DE3) / 参照: UniProt: P42260, UniProt: Q13002 |
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#2: 化合物 | ChemComp-SYM / |
#3: 水 | ChemComp-HOH / |
Has protein modification | Y |
-実験情報
-実験
実験 | 手法: X線回折 |
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-試料調製
結晶 | マシュー密度: 2.29 Å3/Da / 溶媒含有率: 46.25 % |
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結晶化 | 温度: 291 K / 手法: 蒸気拡散法, ハンギングドロップ法 / pH: 8 詳細: Reservoir: 18% PEG 4K Protein buffer: 20 mM NaCl, 5 mM 2S,4R-4-methylglutamate, 1 mM EDTA, 2 mM TRIS pH 8 |
-データ収集
回折 | 平均測定温度: 100 K |
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放射光源 | 由来: シンクロトロン / サイト: APS / ビームライン: 22-ID / 波長: 1 Å |
検出器 | タイプ: RAYONIX MX300-HS / 検出器: CCD / 日付: 2015年7月1日 |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 波長: 1 Å / 相対比: 1 |
反射 | 解像度: 1.27→40 Å / Num. obs: 68757 / % possible obs: 99.4 % / 冗長度: 7 % / Rmerge(I) obs: 0.043 / Net I/σ(I): 45.64 |
反射 シェル | 解像度: 1.27→1.29 Å / 冗長度: 4.7 % / Rmerge(I) obs: 0.335 / Mean I/σ(I) obs: 3.8 / % possible all: 95.2 |
-解析
ソフトウェア |
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精密化 | 構造決定の手法: 分子置換 開始モデル: 1S50 解像度: 1.271→27.287 Å / SU ML: 0.12 / 交差検証法: THROUGHOUT / σ(F): 0.17 / 位相誤差: 16.51 / 立体化学のターゲット値: ML
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溶媒の処理 | 減衰半径: 0.9 Å / VDWプローブ半径: 1.11 Å / 溶媒モデル: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
精密化ステップ | サイクル: LAST / 解像度: 1.271→27.287 Å
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拘束条件 |
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LS精密化 シェル |
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