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データを開く
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基本情報
| 登録情報 | データベース: PDB / ID: 9si0 | |||||||||||||||||||||||||||
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| タイトル | Cryo-EM structure of the catalytic core of human telomerase at the pre-termination state of the repeat addition cycle | |||||||||||||||||||||||||||
要素 |
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キーワード | RNA BINDING PROTEIN / telomerase / H/ACA | |||||||||||||||||||||||||||
| 機能・相同性 | 機能・相同性情報telomere assembly / positive regulation of hair cycle / template-free RNA nucleotidyltransferase activity / positive regulation of transdifferentiation / TERT-RMRP complex / DNA strand elongation / RNA-directed RNA polymerase complex / segmentation / siRNA transcription / urogenital system development ...telomere assembly / positive regulation of hair cycle / template-free RNA nucleotidyltransferase activity / positive regulation of transdifferentiation / TERT-RMRP complex / DNA strand elongation / RNA-directed RNA polymerase complex / segmentation / siRNA transcription / urogenital system development / positive regulation of protein localization to nucleolus / telomerase catalytic core complex / protection from non-homologous end joining at telomere / RNA-templated DNA biosynthetic process / establishment of protein localization to telomere / regulation of establishment of protein localization to telomere / telomerase activity / telomerase inhibitor activity / shelterin complex / Telomere C-strand synthesis initiation / Regulation of MITF-M-dependent genes involved in DNA replication, damage repair and senescence / siRNA processing / Telomere C-strand (Lagging Strand) Synthesis / nuclear telomere cap complex / telomere capping / telomere maintenance via recombination / positive regulation of vascular associated smooth muscle cell migration / telomerase holoenzyme complex / Polymerase switching on the C-strand of the telomere / telomerase RNA binding / embryonic limb morphogenesis / Processive synthesis on the C-strand of the telomere / Removal of the Flap Intermediate from the C-strand / protein localization to chromosome, telomeric region / DNA biosynthetic process / RNA-templated transcription / positive regulation of stem cell proliferation / telomeric repeat DNA binding / negative regulation of telomere maintenance via telomerase / positive regulation of telomere maintenance / negative regulation of cellular senescence / mitochondrial nucleoid / replicative senescence / Telomere Extension By Telomerase / negative regulation of extrinsic apoptotic signaling pathway in absence of ligand / response to cadmium ion / negative regulation of endothelial cell apoptotic process / positive regulation of G1/S transition of mitotic cell cycle / positive regulation of Wnt signaling pathway / telomere maintenance via telomerase / positive regulation of vascular associated smooth muscle cell proliferation / DNA polymerase binding / Packaging Of Telomere Ends / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / telomere maintenance / Inhibition of DNA recombination at telomere / Meiotic synapsis / positive regulation of D-glucose import across plasma membrane / skeletal system development / mitochondrion organization / regulation of protein stability / Formation of the beta-catenin:TCF transactivating complex / intracellular protein transport / PML body / RNA-directed DNA polymerase / positive regulation of miRNA transcription / DNA Damage/Telomere Stress Induced Senescence / transcription coactivator binding / RNA-directed DNA polymerase activity / positive regulation of angiogenesis / protein import into nucleus / structural constituent of chromatin / nucleosome / heart development / protein-folding chaperone binding / cellular response to hypoxia / negative regulation of neuron apoptotic process / tRNA binding / chromosome, telomeric region / nuclear speck / nuclear body / protein heterodimerization activity / RNA-directed RNA polymerase activity / protein-containing complex binding / nucleolus / protein homodimerization activity / DNA binding / RNA binding / nucleoplasm / metal ion binding / identical protein binding / nucleus / plasma membrane / cytosol 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: 3.8 Å | |||||||||||||||||||||||||||
データ登録者 | Balch, S. / Franco-Echevarria, E. / Ghanim, G.E. / Kretsch, R.C. / Das, R. / Nguyen, T.H.D. | |||||||||||||||||||||||||||
| 資金援助 | 英国, European Union, 米国, 5件
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引用 | ジャーナル: Nat Commun / 年: 2026タイトル: Structures of nucleotide-bound human telomerase at several steps of its telomeric DNA repeat addition cycle. 著者: Sebastian Balch / Elsa Franco-Echevarría / George E Ghanim / Rachael C Kretsch / Rhiju Das / Thi Hoang Duong Nguyen / ![]() 要旨: In most eukaryotes, the reverse transcriptase telomerase counteracts telomere shortening by processively adding telomeric DNA repeat sequences to chromosome ends. Telomerase activity depends on the ...In most eukaryotes, the reverse transcriptase telomerase counteracts telomere shortening by processively adding telomeric DNA repeat sequences to chromosome ends. Telomerase activity depends on the telomerase reverse transcriptase (TERT) and the telomerase RNA (hTR in humans). Processive telomere elongation is critical for genome stability, and defects in this mechanism are linked to cellular dysfunction and human disease. However, the structural basis for telomerase repeat addition processivity in humans has remained elusive. Here, we present cryo-electron microscopy structures of human telomerase bound to telomeric DNA and an incoming nucleotide, captured at three distinct stages of its repeat addition cycle: initiation, elongation, and pre-termination. Across these states, the TERT active site maintains a conserved architecture that stabilises a short DNA-RNA duplex of constant length of four base-pairs. Beyond the active site, we identify dynamic structural features in both TERT and hTR that facilitate substrate engagement and RNA template repositioning, thereby supporting the synthesis of successive telomeric repeats. Together, these structures provide key insights into how human telomerase achieves its unique processivity to maintain telomere length and genome integrity. | |||||||||||||||||||||||||||
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構造の表示
| 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 | 9si0.cif.gz | 413.8 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9si0.ent.gz | 311.5 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9si0.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/si/9si0 ftp://data.pdbj.org/pub/pdb/validation_reports/si/9si0 | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 54922MC ![]() 9shyC ![]() 9shzC 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 F&H 検索 |
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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
-タンパク質 , 4種, 4分子 LMOA
| #1: タンパク質 | 分子量: 14140.584 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Homo sapiens (ヒト) / 細胞株: 293T / 参照: UniProt: B2R5B3 |
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| #2: タンパク質 | 分子量: 18074.932 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Homo sapiens (ヒト) / 参照: UniProt: B4DR52 |
| #4: タンパク質 | 分子量: 49013.086 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Homo sapiens (ヒト) / 参照: UniProt: Q96AP0 |
| #6: タンパク質 | 分子量: 127195.812 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: TERT, EST2, TCS1, TRT / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: O14746, RNA-directed DNA polymerase |
-DNA鎖 / RNA鎖 / 非ポリマー , 3種, 3分子 NB

| #3: DNA鎖 | 分子量: 10422.684 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) Homo sapiens (ヒト) |
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| #5: RNA鎖 | 分子量: 145477.797 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / プラスミド: pcDNA3.1 / 細胞株 (発現宿主): 293T / 発現宿主: Homo sapiens (ヒト) / 参照: GenBank: 1932797 |
| #7: 化合物 | ChemComp-1GC / |
-詳細
| 研究の焦点であるリガンドがあるか | Y |
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| Has protein modification | N |
-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: Cryo-EM structure of the catalytic core lobe of human telomerase in the initiation state タイプ: COMPLEX / Entity ID: #1-#6 / 由来: RECOMBINANT | |||||||||||||||||||||||||||||||||||
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| 分子量 | 値: 0.311 MDa / 実験値: NO | |||||||||||||||||||||||||||||||||||
| 由来(天然) | 生物種: Homo sapiens (ヒト) | |||||||||||||||||||||||||||||||||||
| 由来(組換発現) | 生物種: Homo sapiens (ヒト) | |||||||||||||||||||||||||||||||||||
| 緩衝液 | pH: 8 | |||||||||||||||||||||||||||||||||||
| 緩衝液成分 |
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| 試料 | 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: COPPER / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: C-flat | |||||||||||||||||||||||||||||||||||
| 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
| 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: TFS 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): 81000 X / 倍率(補正後): 45872 X / 最大 デフォーカス(公称値): 2400 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: 50 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 最低温度: 78 K |
| 撮影 | 平均露光時間: 2.5 sec. / 電子線照射量: 48 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 実像数: 69180 |
| 電子光学装置 | エネルギーフィルター名称: GIF Quantum LS / 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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| 画像処理 | 詳細: All images were processed using RELION 4.0, RELION 5.0 and CryoSPARC 4.1.2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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: 14883068 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3次元再構成 | 解像度: 3.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 95317 / 対称性のタイプ: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | PDB-ID: 7QXA Accession code: 7QXA / Source name: PDB / タイプ: experimental model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 精密化 | 解像度: 3.8→173.68 Å / Cor.coef. Fo:Fc: 0.953 / SU B: 36.312 / SU ML: 0.516 / ESU R: 0.612 立体化学のターゲット値: MAXIMUM LIKELIHOOD WITH PHASES 詳細: HYDROGENS HAVE BEEN USED IF PRESENT IN THE INPUT
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| 溶媒の処理 | 溶媒モデル: PARAMETERS FOR MASK CACLULATION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 原子変位パラメータ | Biso mean: 203.238 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 精密化ステップ | サイクル: 1 / 合計: 15566 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 拘束条件 |
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ムービー
コントローラー
万見について




Homo sapiens (ヒト)
英国, European Union,
米国, 5件
引用




PDBj


































































FIELD EMISSION GUN