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基本情報
| 登録情報 | データベース: PDB / ID: 6ebm | ||||||
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| タイトル | The voltage-activated Kv1.2-2.1 paddle chimera channel in lipid nanodiscs, transmembrane domain of subunit alpha | ||||||
要素 | Potassium voltage-gated channel subfamily A member 2,Potassium voltage-gated channel subfamily B member 2 chimera | ||||||
キーワード | MEMBRANE PROTEIN / transport protein / potassium channel / lipid nanodisc | ||||||
| 機能・相同性 | 機能・相同性情報optic nerve structural organization / Voltage gated Potassium channels / voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / potassium channel complex / regulation of circadian sleep/wake cycle, non-REM sleep / paranodal junction / potassium ion export across plasma membrane / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / delayed rectifier potassium channel activity ...optic nerve structural organization / Voltage gated Potassium channels / voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / potassium channel complex / regulation of circadian sleep/wake cycle, non-REM sleep / paranodal junction / potassium ion export across plasma membrane / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / delayed rectifier potassium channel activity / axon initial segment / juxtaparanode region of axon / optic nerve development / outward rectifier potassium channel activity / neuronal cell body membrane / regulation of dopamine secretion / lamellipodium membrane / action potential / voltage-gated potassium channel activity / potassium channel regulator activity / kinesin binding / neuronal action potential / voltage-gated potassium channel complex / potassium ion transmembrane transport / sensory perception of pain / axon terminus / calyx of Held / protein localization to plasma membrane / potassium ion transport / protein homooligomerization / cerebral cortex development / lamellipodium / presynaptic membrane / perikaryon / transmembrane transporter binding / postsynaptic membrane / endosome / protein heterodimerization activity / axon / neuronal cell body / dendrite / endoplasmic reticulum membrane / glutamatergic synapse / 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: 4 Å | ||||||
データ登録者 | Matthies, D. / Bae, C. / Fox, T. / Bartesaghi, A. / Subramaniam, S. / Swartz, K.J. | ||||||
引用 | ジャーナル: Elife / 年: 2018タイトル: Single-particle cryo-EM structure of a voltage-activated potassium channel in lipid nanodiscs. 著者: Doreen Matthies / Chanhyung Bae / Gilman Es Toombes / Tara Fox / Alberto Bartesaghi / Sriram Subramaniam / Kenton Jon Swartz / ![]() 要旨: Voltage-activated potassium (Kv) channels open to conduct K ions in response to membrane depolarization, and subsequently enter non-conducting states through distinct mechanisms of inactivation. X- ...Voltage-activated potassium (Kv) channels open to conduct K ions in response to membrane depolarization, and subsequently enter non-conducting states through distinct mechanisms of inactivation. X-ray structures of detergent-solubilized Kv channels appear to have captured an open state even though a non-conducting C-type inactivated state would predominate in membranes in the absence of a transmembrane voltage. However, structures for a voltage-activated ion channel in a lipid bilayer environment have not yet been reported. Here we report the structure of the Kv1.2-2.1 paddle chimera channel reconstituted into lipid nanodiscs using single-particle cryo-electron microscopy. At a resolution of ~3 Å for the cytosolic domain and ~4 Å for the transmembrane domain, the structure determined in nanodiscs is similar to the previously determined X-ray structure. Our findings show that large differences in structure between detergent and lipid bilayer environments are unlikely, and enable us to propose possible structural mechanisms for C-type inactivation. | ||||||
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構造の表示
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| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 6ebm.cif.gz | 213.3 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb6ebm.ent.gz | 161.4 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 6ebm.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
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/eb/6ebm ftp://data.pdbj.org/pub/pdb/validation_reports/eb/6ebm | HTTPS FTP |
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-関連構造データ
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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: 58905.828 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() Komagataella pastoris (菌類) / 参照: UniProt: P63142, UniProt: Q63099 |
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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: Voltage-activated potassium channel Kv1.2-2.1 paddle chimera in lipid nanodiscs, transmembrane domain タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT | ||||||||||||||||||||
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| 分子量 | 値: 0.385 MDa / 実験値: NO | ||||||||||||||||||||
| 由来(天然) | 生物種: ![]() | ||||||||||||||||||||
| 由来(組換発現) | 生物種: Komagataella pastoris (菌類) / プラスミド: pPICZ | ||||||||||||||||||||
| 緩衝液 | pH: 7.5 | ||||||||||||||||||||
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| 試料 | 濃度: 0.7 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Kv1.2-2.1 paddle chimera in lipid nanodiscs, transmembrane alpha subunits | ||||||||||||||||||||
| 試料支持 | グリッドの材料: GOLD / グリッドのタイプ: Quantifoil, UltrAuFoil, R1.2/1.3 | ||||||||||||||||||||
| 急速凍結 | 装置: LEICA EM GP / 凍結剤: ETHANE / 湿度: 88 % / 凍結前の試料温度: 277.15 K 詳細: A 3 microliter sample was applied to a plasma-cleaned grid and blotted for 10 seconds. |
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電子顕微鏡撮影
| 実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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| 顕微鏡 | モデル: FEI TITAN KRIOS |
| 電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
| 電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 29000 X / 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 / Cs: 2.7 mm / C2レンズ絞り径: 70 µm / アライメント法: COMA FREE |
| 試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
| 撮影 | 平均露光時間: 15.2 sec. / 電子線照射量: 40 e/Å2 / 検出モード: SUPER-RESOLUTION フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 撮影したグリッド数: 1 / 実像数: 3085 |
| 画像スキャン | 横: 7420 / 縦: 7676 / 動画フレーム数/画像: 38 / 利用したフレーム数/画像: 2-20 |
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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 ONLY | ||||||||||||||||||||||||||||||||||||||||
| 粒子像の選択 | 選択した粒子像数: 281021 | ||||||||||||||||||||||||||||||||||||||||
| 対称性 | 点対称性: C4 (4回回転対称) | ||||||||||||||||||||||||||||||||||||||||
| 3次元再構成 | 解像度: 4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 65745 / クラス平均像の数: 1 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | B value: 123 / プロトコル: FLEXIBLE FIT / 空間: REAL | ||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | PDB-ID: 2R9R Accession code: 2R9R / Source name: PDB / タイプ: experimental model |
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万見について






引用
UCSF Chimera











PDBj






Komagataella pastoris (菌類)

