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基本情報
登録情報 | データベース: PDB / ID: 9d66 | |||||||||
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タイトル | Human excitatory amino acid transporter 3 (EAAT3) with bound L-Aspartate in an intermediate outward facing state | |||||||||
![]() | Excitatory amino acid transporter 3 | |||||||||
![]() | TRANSPORT PROTEIN / EAAT3 / L-Asp / iOFS | |||||||||
機能・相同性 | ![]() D-aspartate transmembrane transport / regulation of protein targeting to membrane / D-aspartate transmembrane transporter activity / Defective SLC1A1 is implicated in schizophrenia 18 (SCZD18) and dicarboxylic aminoaciduria (DCBXA) / distal dendrite / cysteine transport / cysteine transmembrane transporter activity / neurotransmitter receptor transport to plasma membrane / high-affinity L-glutamate transmembrane transporter activity / glutamate:sodium symporter activity ...D-aspartate transmembrane transport / regulation of protein targeting to membrane / D-aspartate transmembrane transporter activity / Defective SLC1A1 is implicated in schizophrenia 18 (SCZD18) and dicarboxylic aminoaciduria (DCBXA) / distal dendrite / cysteine transport / cysteine transmembrane transporter activity / neurotransmitter receptor transport to plasma membrane / high-affinity L-glutamate transmembrane transporter activity / glutamate:sodium symporter activity / response to decreased oxygen levels / L-glutamate import / cellular response to mercury ion / Transport of inorganic cations/anions and amino acids/oligopeptides / retina layer formation / L-glutamate transmembrane transporter activity / cellular response to ammonium ion / L-glutamate transmembrane transport / glutathione biosynthetic process / D-aspartate import across plasma membrane / L-aspartate transmembrane transport / righting reflex / zinc ion transmembrane transport / cellular response to bisphenol A / L-aspartate transmembrane transporter activity / grooming behavior / intracellular glutamate homeostasis / L-aspartate import across plasma membrane / Glutamate Neurotransmitter Release Cycle / proximal dendrite / monoatomic anion channel activity / L-glutamate import across plasma membrane / apical dendrite / transepithelial transport / response to anesthetic / conditioned place preference / intracellular zinc ion homeostasis / cellular response to cocaine / chloride transmembrane transporter activity / blood vessel morphogenesis / motor neuron apoptotic process / response to morphine / G protein-coupled dopamine receptor signaling pathway / motor behavior / glutamate receptor signaling pathway / glutamate binding / neurotransmitter transport / superoxide metabolic process / heart contraction / maintenance of blood-brain barrier / perisynaptic space / dopamine metabolic process / adult behavior / : / asymmetric synapse / glial cell projection / response to axon injury / behavioral fear response / synaptic cleft / postsynaptic modulation of chemical synaptic transmission / transport across blood-brain barrier / positive regulation of heart rate / monoatomic ion transport / neurogenesis / axon terminus / response to amphetamine / chloride transmembrane transport / dendritic shaft / cell periphery / locomotory behavior / synapse organization / cytokine-mediated signaling pathway / brain development / Schaffer collateral - CA1 synapse / memory / long-term synaptic potentiation / recycling endosome membrane / late endosome membrane / presynapse / cellular response to oxidative stress / early endosome membrane / gene expression / chemical synaptic transmission / dendritic spine / perikaryon / negative regulation of neuron apoptotic process / apical plasma membrane / membrane raft / response to xenobiotic stimulus / axon / external side of plasma membrane / neuronal cell body / dendrite / endoplasmic reticulum / extracellular exosome / metal ion binding / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.98 Å | |||||||||
![]() | Qiu, B. / Boudker, O. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural basis of the excitatory amino acid transporter 3 substrate recognition. 著者: Biao Qiu / Olga Boudker / ![]() 要旨: Excitatory amino acid transporters (EAATs) reside on cell surfaces and uptake substrates, including L-glutamate, L-aspartate, and D-aspartate, using ion gradients. Among five EAATs, EAAT3 is the only ...Excitatory amino acid transporters (EAATs) reside on cell surfaces and uptake substrates, including L-glutamate, L-aspartate, and D-aspartate, using ion gradients. Among five EAATs, EAAT3 is the only isoform that can efficiently transport L-cysteine, a substrate for glutathione synthesis. Recent work suggests that EAAT3 also transports the oncometabolite R-2-hydroxyglutarate (R-2HG). Here, we examined the structural basis of substrate promiscuity by determining the cryo-EM structures of EAAT3 bound to different substrates. We found that L-cysteine binds to EAAT3 in thiolate form, and EAAT3 recognizes different substrates by fine-tuning local conformations of the coordinating residues. However, using purified human EAAT3, we could not observe R-2HG binding or transport. Imaging of EAAT3 bound to L-cysteine revealed several conformational states, including an outward-facing state with a semi-open gate and a disrupted sodium-binding site. These structures illustrate that the full gate closure, coupled with the binding of the last sodium ion, occurs after substrate binding. Furthermore, we observed that different substrates affect how the transporter distributes between a fully outward-facing conformation and intermediate occluded states on a path to the inward-facing conformation, suggesting that translocation rates are substrate-dependent. | |||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 237.2 KB | 表示 | ![]() |
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PDB形式 | ![]() | 188.5 KB | 表示 | ![]() |
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その他 | ![]() |
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-関連構造データ
関連構造データ | ![]() 46586MC ![]() 9d67C ![]() 9d68C ![]() 9d69C ![]() 9d6aC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 57120.863 Da / 分子数: 3 変異: C9A, C100A, C158A, N178T, N195T, C219A, C256W, K269C, W441C 由来タイプ: 組換発現 詳細: The first 2 residues "GP" is from the prescission protease cutting site. 由来: (組換発現) ![]() ![]() #2: 化合物 | #3: 化合物 | ChemComp-NA / #4: 化合物 | #5: 水 | ChemComp-HOH / | 研究の焦点であるリガンドがあるか | Y | Has protein modification | Y | |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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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: EAAT3 with L-Asp bound at iOFS* / タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() |
緩衝液 | pH: 7.4 詳細: 20 mM Hepes-Tris pH 7.4, 200 mM NaCl , 10 mM L-Aspartate, and 0.01% GDN |
試料 | 濃度: 5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: GOLD / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K |
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電子顕微鏡撮影
顕微鏡 | モデル: TFS GLACIOS |
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電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1000 nm |
試料ホルダ | 凍結剤: NITROGEN |
撮影 | 電子線照射量: 40 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
電子光学装置 | エネルギーフィルタースリット幅: 20 eV |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 12668720 | ||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C3 (3回回転対称) | ||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.98 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 908281 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 51.23 / プロトコル: OTHER / 空間: REAL | ||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 8CTC Accession code: 8CTC / Source name: PDB / タイプ: experimental model |