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- EMDB-0477: Cryo-EM structure of human TPC2 channel in the ligand-bound open state -
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基本情報
登録情報 | データベース: EMDB / ID: EMD-0477 | |||||||||||||||
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タイトル | Cryo-EM structure of human TPC2 channel in the ligand-bound open state | |||||||||||||||
![]() | Human TPC2 channel in the ligand-bound open state | |||||||||||||||
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![]() | channel / lysosome / TRANSPORT PROTEIN | |||||||||||||||
機能・相同性 | ![]() endosome to lysosome transport of low-density lipoprotein particle / negative regulation of developmental pigmentation / intracellular pH reduction / intracellularly phosphatidylinositol-3,5-bisphosphate-gated monatomic cation channel activity / NAADP-sensitive calcium-release channel activity / regulation of exocytosis / melanosome membrane / response to vitamin D / endolysosome membrane / phosphatidylinositol-3,5-bisphosphate binding ...endosome to lysosome transport of low-density lipoprotein particle / negative regulation of developmental pigmentation / intracellular pH reduction / intracellularly phosphatidylinositol-3,5-bisphosphate-gated monatomic cation channel activity / NAADP-sensitive calcium-release channel activity / regulation of exocytosis / melanosome membrane / response to vitamin D / endolysosome membrane / phosphatidylinositol-3,5-bisphosphate binding / ligand-gated sodium channel activity / lysosome organization / smooth muscle contraction / monoatomic ion channel complex / voltage-gated calcium channel activity / receptor-mediated endocytosis of virus by host cell / release of sequestered calcium ion into cytosol / sodium ion transmembrane transport / calcium-mediated signaling / calcium channel activity / Stimuli-sensing channels / intracellular calcium ion homeostasis / late endosome membrane / monoatomic ion transmembrane transport / lysosome / regulation of autophagy / endosome membrane / endocytosis involved in viral entry into host cell / lysosomal membrane / protein kinase binding / identical protein binding / cytosol 類似検索 - 分子機能 | |||||||||||||||
生物種 | ![]() | |||||||||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.7 Å | |||||||||||||||
![]() | She J / Zeng W | |||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural mechanisms of phospholipid activation of the human TPC2 channel. 著者: Ji She / Weizhong Zeng / Jiangtao Guo / Qingfeng Chen / Xiao-Chen Bai / Youxing Jiang / ![]() ![]() 要旨: Mammalian two-pore channels (TPCs) regulate the physiological functions of the endolysosome. Here we present cryo-EM structures of human TPC2 (HsTPC2), a phosphatidylinositol 3,5-bisphosphate (PI(3,5) ...Mammalian two-pore channels (TPCs) regulate the physiological functions of the endolysosome. Here we present cryo-EM structures of human TPC2 (HsTPC2), a phosphatidylinositol 3,5-bisphosphate (PI(3,5)P)-activated, Na selective channel, in the ligand-bound and apo states. The apo structure captures the closed conformation, while the ligand-bound form features the channel in both open and closed conformations. Combined with functional analysis, these structures provide insights into the mechanism of PI(3,5)P-regulated gating of TPC2, which is distinct from that of TPC1. Specifically, the endolysosome-specific PI(3,5)P binds at the first 6-TM and activates the channel - independently of the membrane potential - by inducing a structural change at the pore-lining inner helix (IS6), which forms a continuous helix in the open state but breaks into two segments at Gly317 in the closed state. Additionally, structural comparison to the voltage-dependent TPC1 structure allowed us to identify Ile551 as being responsible for the loss of voltage dependence in TPC2. | |||||||||||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | EMマップ: ![]() ![]() ![]() |
添付画像 |
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ダウンロードとリンク
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マップデータ | ![]() | 48.8 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 14 KB 14 KB | 表示 表示 | ![]() |
画像 | ![]() | 190.5 KB | ||
Filedesc metadata | ![]() | 6.4 KB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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リンク
EMDBのページ | ![]() ![]() |
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Human TPC2 channel in the ligand-bound open state | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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: 1.07 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
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試料の構成要素
-全体 : The complex of TPC2 with PI(3,5)P2
全体 | 名称: The complex of TPC2 with PI(3,5)P2 |
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要素 |
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-超分子 #1: The complex of TPC2 with PI(3,5)P2
超分子 | 名称: The complex of TPC2 with PI(3,5)P2 / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 |
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由来(天然) | 生物種: ![]() |
-分子 #1: Two pore calcium channel protein 2
分子 | 名称: Two pore calcium channel protein 2 / タイプ: protein_or_peptide / ID: 1 / コピー数: 2 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 85.671828 KDa |
組換発現 | 生物種: ![]() |
配列 | 文字列: GSLEMAEPQA ESEPAAGGAR GGGGDWPAGL TTYRSIQVGP GAAARWDLCI DQAVVFIEDA IQYRSINHRV DASSMWLYRR YYSNVCQRT LSFTIFLILF LAFIETPSSL TSTADVRYRA APWEPPCGLT ESVEVLCLLV FAADLSVKGY LFGWAHFQKN L WLLGYLVV ...文字列: GSLEMAEPQA ESEPAAGGAR GGGGDWPAGL TTYRSIQVGP GAAARWDLCI DQAVVFIEDA IQYRSINHRV DASSMWLYRR YYSNVCQRT LSFTIFLILF LAFIETPSSL TSTADVRYRA APWEPPCGLT ESVEVLCLLV FAADLSVKGY LFGWAHFQKN L WLLGYLVV LVVSLVDWTV SLSLVCHEPL RIRRLLRPFF LLQNSSMMKK TLKCIRWSLP EMASVGLLLA IHLCLFTMFG ML LFAGGKQ DDGQDRERLT YFQNLPESLT SLLVLLTTAN NPDVMIPAYS KNRAYAIFFI VFTVIGSLFL MNLLTAIIYS QFR GYLMKS LQTSLFRRRL GTRAAFEVLS SMVGEGGAFP QAVGVKPQNL LQVLQKVQLD SSHKQAMMEK VRSYGSVLLS AEEF QKLFN ELDRSVVKEH PPRPEYQSPF LQSAQFLFGH YYFDYLGNLI ALANLVSICV FLVLDADVLP AERDDFILGI LNCVF IVYY LLEMLLKVFA LGLRGYLSYP SNVFDGLLTV VLLVLEISTL AVYRLPHPGW RPEMVGLLSL WDMTRMLNML IVFRFL RII PSMKPMAVVA STVLGLVQNM RAFGGILVVV YYVFAIIGIN LFRGVIVALP GNSSLAPANG SAPCGSFEQL EYWANNF DD FAAALVTLWN LMVVNNWQVF LDAYRRYSGP WSKIYFVLWW LVSSVIWVNL FLALILENFL HKWDPRSHLQ PLAGTPEA T YQMTVELLFR DILEEPEEDE LTERLSQHPH LWLCR UniProtKB: Two pore channel protein 2 |
-分子 #2: (2R)-3-{[(S)-hydroxy{[(1S,2R,3R,4S,5S,6R)-2,4,6-trihydroxy-3,5-bi...
分子 | 名称: (2R)-3-{[(S)-hydroxy{[(1S,2R,3R,4S,5S,6R)-2,4,6-trihydroxy-3,5-bis(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}propane-1,2-diyl dioctanoate タイプ: ligand / ID: 2 / コピー数: 2 / 式: EUJ |
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分子量 | 理論値: 746.566 Da |
Chemical component information | ![]() ChemComp-EUJ: |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
緩衝液 | pH: 8 |
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グリッド | 詳細: unspecified |
凍結 | 凍結剤: ETHANE |
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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 K2 SUMMIT (4k x 4k) 平均電子線量: 1.6 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |