+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-43131 | |||||||||
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タイトル | Voltage gated potassium ion channel Kv1.2 in complex with DTx | |||||||||
マップデータ | Kv1.2 DTX bound map | |||||||||
試料 |
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キーワード | Ion Channel / Toxin bound / Blocker / MEMBRANE PROTEIN | |||||||||
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 / paranodal junction / regulation of circadian sleep/wake cycle, non-REM sleep / potassium ion export across plasma membrane / axon initial segment / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential ...optic nerve structural organization / Voltage gated Potassium channels / voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / potassium channel complex / paranodal junction / regulation of circadian sleep/wake cycle, non-REM sleep / potassium ion export across plasma membrane / axon initial segment / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / delayed rectifier potassium channel activity / outward rectifier potassium channel activity / juxtaparanode region of axon / optic nerve development / regulation of dopamine secretion / neuronal cell body membrane / action potential / kinesin binding / lamellipodium membrane / calyx of Held / voltage-gated potassium channel activity / neuronal action potential / potassium channel regulator activity / voltage-gated potassium channel complex / axon terminus / sensory perception of pain / potassium ion transmembrane transport / serine-type endopeptidase inhibitor activity / protein homooligomerization / cerebral cortex development / lamellipodium / presynaptic membrane / toxin activity / perikaryon / postsynaptic membrane / endosome / axon / glutamatergic synapse / dendrite / endoplasmic reticulum membrane / extracellular space / membrane / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | Komagataella pastoris (菌類) / Dendroaspis angusticeps (コブラ) / Rattus norvegicus (ドブネズミ) | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.2 Å | |||||||||
データ登録者 | Wu Y / Sigworth FJ | |||||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: bioRxiv / 年: 2024 タイトル: Cryo-EM structures of Kv1.2 potassium channels, conducting and non-conducting. 著者: Yangyu Wu / Yangyang Yan / Youshan Yang / Shumin Bian / Alberto Rivetta / Ken Allen / Fred J Sigworth / 要旨: We present near-atomic-resolution cryo-EM structures of the mammalian voltage-gated potassium channel Kv1.2 in open, C-type inactivated, toxin-blocked and sodium-bound states at 3.2 Å, 2.5 Å, 3.2 ...We present near-atomic-resolution cryo-EM structures of the mammalian voltage-gated potassium channel Kv1.2 in open, C-type inactivated, toxin-blocked and sodium-bound states at 3.2 Å, 2.5 Å, 3.2 Å, and 2.9Å. These structures, all obtained at nominally zero membrane potential in detergent micelles, reveal distinct ion-occupancy patterns in the selectivity filter. The first two structures are very similar to those reported in the related Shaker channel and the much-studied Kv1.2-2.1 chimeric channel. On the other hand, two new structures show unexpected patterns of ion occupancy. First, the toxin α-Dendrotoxin, like Charybdotoxin, is seen to attach to the negatively-charged channel outer mouth, and a lysine residue penetrates into the selectivity filter, with the terminal amine coordinated by carbonyls, partially disrupting the outermost ion-binding site. In the remainder of the filter two densities of bound ions are observed, rather than three as observed with other toxin-blocked Kv channels. Second, a structure of Kv1.2 in Na solution does not show collapse or destabilization of the selectivity filter, but instead shows an intact selectivity filter with ion density in each binding site. We also attempted to image the C-type inactivated Kv1.2 W366F channel in Na solution, but the protein conformation was seen to be highly variable and only a low-resolution structure could be obtained. These findings present new insights into the stability of the selectivity filter and the mechanism of toxin block of this intensively studied, voltage-gated potassium channel. | |||||||||
履歴 |
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-構造の表示
添付画像 |
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-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_43131.map.gz | 59.6 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-43131-v30.xml emd-43131.xml | 14.7 KB 14.7 KB | 表示 表示 | EMDBヘッダ |
FSC (解像度算出) | emd_43131_fsc.xml | 8.4 KB | 表示 | FSCデータファイル |
画像 | emd_43131.png | 75.2 KB | ||
Filedesc metadata | emd-43131.cif.gz | 5.6 KB | ||
その他 | emd_43131_half_map_1.map.gz emd_43131_half_map_2.map.gz | 59.4 MB 59.4 MB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-43131 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-43131 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_43131_validation.pdf.gz | 1 MB | 表示 | EMDB検証レポート |
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文書・詳細版 | emd_43131_full_validation.pdf.gz | 1 MB | 表示 | |
XML形式データ | emd_43131_validation.xml.gz | 16.3 KB | 表示 | |
CIF形式データ | emd_43131_validation.cif.gz | 21.1 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-43131 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-43131 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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「今月の分子」の関連する項目 |
-マップ
ファイル | ダウンロード / ファイル: emd_43131.map.gz / 形式: CCP4 / 大きさ: 64 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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注釈 | Kv1.2 DTX bound map | ||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.068 Å | ||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
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-添付データ
-ハーフマップ: Kv1.2 DTX bound half map
ファイル | emd_43131_half_map_1.map | ||||||||||||
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注釈 | Kv1.2 DTX bound half map | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: Kv1.2 DTX bound half map
ファイル | emd_43131_half_map_2.map | ||||||||||||
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注釈 | Kv1.2 DTX bound half map | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-試料の構成要素
-全体 : Voltage gated potassium channel Kv1.2 with DTx bound
全体 | 名称: Voltage gated potassium channel Kv1.2 with DTx bound |
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要素 |
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-超分子 #1: Voltage gated potassium channel Kv1.2 with DTx bound
超分子 | 名称: Voltage gated potassium channel Kv1.2 with DTx bound タイプ: cell / ID: 1 / 親要素: 0 / 含まれる分子: #1-#2 |
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由来(天然) | 生物種: Komagataella pastoris (菌類) / 株: SMD1168 |
-分子 #1: Kunitz-type serine protease inhibitor homolog alpha-dendrotoxin
分子 | 名称: Kunitz-type serine protease inhibitor homolog alpha-dendrotoxin タイプ: protein_or_peptide / ID: 1 / コピー数: 1 / 光学異性体: LEVO |
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由来(天然) | 生物種: Dendroaspis angusticeps (コブラ) |
分子量 | 理論値: 7.015129 KDa |
配列 | 文字列: GPRRKLCILH RNPGRCYDKI PAFYYNQKKK QCERFDWSGC GGNSNRFKTI EECRRTCIG UniProtKB: Kunitz-type serine protease inhibitor homolog alpha-dendrotoxin |
-分子 #2: Potassium voltage-gated channel subfamily A member 2
分子 | 名称: Potassium voltage-gated channel subfamily A member 2 タイプ: protein_or_peptide / ID: 2 / コピー数: 4 / 光学異性体: LEVO |
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由来(天然) | 生物種: Rattus norvegicus (ドブネズミ) |
分子量 | 理論値: 60.59157 KDa |
組換発現 | 生物種: Komagataella pastoris (菌類) |
配列 | 文字列: MSAWSHPQFE KGGGSGGGSG GSAWSHPQFE KLVPRGSMTV ATGDPVDEAA AHPGHPQDTY DPEADHECCE RVVINISGLR FETQLKTLA QFPETLLGDP KKRMRYFDPL RNEYFFDRNR PSFDAILYYY QSGGRLRRPV NVPLDIFSEE IRFYELGEEA M EMFREDEG ...文字列: MSAWSHPQFE KGGGSGGGSG GSAWSHPQFE KLVPRGSMTV ATGDPVDEAA AHPGHPQDTY DPEADHECCE RVVINISGLR FETQLKTLA QFPETLLGDP KKRMRYFDPL RNEYFFDRNR PSFDAILYYY QSGGRLRRPV NVPLDIFSEE IRFYELGEEA M EMFREDEG YIKEEERPLP ENEFQRQVWL LFEYPESSGP ARIIAIVSVM VILISIVSFC LETLPIFRDE NEDMHGSGVT FH TYSQSTI GYQQSTSFTD PFFIVETLCI IWFSFEFLVR FFACPSKAGF FTNIMNIIDI VAIIPYFITL GTELAEKPED AQQ GQQAMS LAILRVIRLV RVFRIFKLSR HSKGLQILGQ TLKASMRELG LLIFFLFIGV ILFSSAVYFA EADERDSQFP SIPD AFWWA VVSMTTVGYG DMVPTTIGGK IVGSLCAIAG VLTIALPVPV IVSNFNYFYH RETEGEEQAQ YLQVTSCPKI PSSPD LKKS RSASTISKSD YMEIQEGVNN SNEDFREENL KTANCTLANT NYVNITKMLT DV UniProtKB: Potassium voltage-gated channel subfamily A member 2 |
-分子 #3: POTASSIUM ION
分子 | 名称: POTASSIUM ION / タイプ: ligand / ID: 3 / コピー数: 2 / 式: K |
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分子量 | 理論値: 39.098 Da |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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解析 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
濃度 | 0.1 mg/mL |
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緩衝液 | pH: 7.4 |
凍結 | 凍結剤: ETHANE |
-電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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撮影 | フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 平均電子線量: 50.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2.0 µm / 最小 デフォーカス(公称値): 1.0 µm |
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |