+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 5u6p | ||||||
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タイトル | Structure of the human HCN1 hyperpolarization-activated cyclic nucleotide-gated ion channel in complex with cAMP | ||||||
要素 | (Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 11) x 2 | ||||||
キーワード | TRANSPORT PROTEIN / pacemaker ion channel | ||||||
機能・相同性 | 機能・相同性情報 intracellular cAMP-activated cation channel activity involved in regulation of presynaptic membrane potential / HCN channels / general adaptation syndrome, behavioral process / HCN channel complex / retinal cone cell development / intracellularly cAMP-activated cation channel activity / regulation of membrane depolarization / apical protein localization / voltage-gated monoatomic cation channel activity / voltage-gated sodium channel activity ...intracellular cAMP-activated cation channel activity involved in regulation of presynaptic membrane potential / HCN channels / general adaptation syndrome, behavioral process / HCN channel complex / retinal cone cell development / intracellularly cAMP-activated cation channel activity / regulation of membrane depolarization / apical protein localization / voltage-gated monoatomic cation channel activity / voltage-gated sodium channel activity / voltage-gated potassium channel activity / potassium channel activity / neuronal action potential / sodium ion transmembrane transport / cAMP binding / presynaptic active zone membrane / cellular response to cAMP / potassium ion transmembrane transport / regulation of membrane potential / postsynaptic membrane / protein homotetramerization / axon / glutamatergic synapse / dendrite / identical protein binding / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | Homo sapiens (ヒト) | ||||||
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: 3.51 Å | ||||||
データ登録者 | Lee, C.-H. / MacKinnon, R. | ||||||
引用 | ジャーナル: Cell / 年: 2017 タイトル: Structures of the Human HCN1 Hyperpolarization-Activated Channel. 著者: Chia-Hsueh Lee / Roderick MacKinnon / 要旨: Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels underlie the control of rhythmic activity in cardiac and neuronal pacemaker cells. In HCN, the polarity of voltage dependence is ...Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels underlie the control of rhythmic activity in cardiac and neuronal pacemaker cells. In HCN, the polarity of voltage dependence is uniquely reversed. Intracellular cyclic adenosine monophosphate (cAMP) levels tune the voltage response, enabling sympathetic nerve stimulation to increase the heart rate. We present cryo-electron microscopy structures of the human HCN channel in the absence and presence of cAMP at 3.5 Å resolution. HCN channels contain a K channel selectivity filter-forming sequence from which the amino acids create a unique structure that explains Na and K permeability. The voltage sensor adopts a depolarized conformation, and the pore is closed. An S4 helix of unprecedented length extends into the cytoplasm, contacts the C-linker, and twists the inner helical gate shut. cAMP binding rotates cytoplasmic domains to favor opening of the inner helical gate. These structures advance understanding of ion selectivity, reversed polarity gating, and cAMP regulation in HCN channels. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 5u6p.cif.gz | 404.4 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb5u6p.ent.gz | 321.9 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 5u6p.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 | 5u6p_validation.pdf.gz | 1.2 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 5u6p_full_validation.pdf.gz | 1.2 MB | 表示 | |
XML形式データ | 5u6p_validation.xml.gz | 52.7 KB | 表示 | |
CIF形式データ | 5u6p_validation.cif.gz | 81.3 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/u6/5u6p ftp://data.pdbj.org/pub/pdb/validation_reports/u6/5u6p | 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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非結晶学的対称性 (NCS) | NCS oper:
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詳細 | The structure is a tetramer. Chains E, F, G, and H are portions of chains A, B, C, and D, respectively, that are modeled separately. |
-要素
#1: タンパク質 | 分子量: 74643.734 Da / 分子数: 4 / 断片: UNP residues 1-635,866-890 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: HCN1, BCNG1 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: O60741 #2: タンパク質・ペプチド | 分子量: 1635.006 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: HCN1, BCNG1 / 発現宿主: Homo sapiens (ヒト) #3: 化合物 | ChemComp-CMP / 配列の詳細 | Chains E, F, G, and H are residues ~615 to ~633 (uncertain register) of chains A, B, C, and D. They ...Chains E, F, G, and H are residues ~615 to ~633 (uncertain register) of chains A, B, C, and D. They are represented as separate chains at the authors' request. | |
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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 |
-試料調製
構成要素 | 名称: Human HCN1 hyperpolarization-activated cyclic nucleotide-gated ion channel in complex with cAMP タイプ: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1-#2 / 由来: RECOMBINANT |
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由来(天然) | 生物種: Homo sapiens (ヒト) |
由来(組換発現) | 生物種: Homo sapiens (ヒト) / プラスミド: pEG_BacMam |
緩衝液 | pH: 8 |
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: 400 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 凍結剤: ETHANE |
-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 / 最大 デフォーカス(公称値): 3300 nm / 最小 デフォーカス(公称値): 1500 nm |
撮影 | 電子線照射量: 1.78 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) |
-解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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対称性 | 点対称性: C4 (4回回転対称) |
3次元再構成 | 解像度: 3.51 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 125339 / 対称性のタイプ: POINT |