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基本情報
登録情報 | データベース: PDB / ID: 8sok | |||||||||
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タイトル | Cryo-EM structure of human CST bound to POT1(ESDL)/TPP1 in the presence of telomeric ssDNA | |||||||||
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![]() | DNA BINDING PROTEIN / telomere / shelterin / cst / complex | |||||||||
機能・相同性 | ![]() positive regulation of DNA strand elongation / positive regulation of telomeric D-loop disassembly / G-rich single-stranded DNA binding / telomere assembly / CST complex / segmentation / urogenital system development / 8-hydroxy-2'-deoxyguanosine DNA binding / telomeric D-loop binding / protection from non-homologous end joining at telomere ...positive regulation of DNA strand elongation / positive regulation of telomeric D-loop disassembly / G-rich single-stranded DNA binding / telomere assembly / CST complex / segmentation / urogenital system development / 8-hydroxy-2'-deoxyguanosine DNA binding / telomeric D-loop binding / protection from non-homologous end joining at telomere / regulation of double-strand break repair via nonhomologous end joining / telomerase inhibitor activity / DEAD/H-box RNA helicase binding / regulation of establishment of protein localization to telomere / establishment of protein localization to telomere / telomeric D-loop disassembly / shelterin complex / telomere maintenance via telomere lengthening / Telomere C-strand synthesis initiation / regulation of telomere maintenance via telomerase / Telomere C-strand (Lagging Strand) Synthesis / single-stranded telomeric DNA binding / nuclear telomere cap complex / G-rich strand telomeric DNA binding / telomere capping / intermediate filament cytoskeleton / Processive synthesis on the C-strand of the telomere / Polymerase switching on the C-strand of the telomere / Removal of the Flap Intermediate from the C-strand / telomerase holoenzyme complex / embryonic limb morphogenesis / bone marrow development / protein localization to chromosome, telomeric region / telomeric DNA binding / hematopoietic stem cell proliferation / negative regulation of telomere maintenance via telomerase / positive regulation of telomere maintenance / Telomere Extension By Telomerase / replicative senescence / carbohydrate transmembrane transporter activity / maltose binding / maltose transport / maltodextrin transmembrane transport / telomere maintenance via telomerase / Packaging Of Telomere Ends / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / spleen development / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / regulation of G2/M transition of mitotic cell cycle / DNA polymerase binding / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MDA-5 activity / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / positive regulation of telomere maintenance via telomerase / Inhibition of DNA recombination at telomere / Meiotic synapsis / telomere maintenance / bioluminescence / thymus development / positive regulation of DNA replication / skeletal system development / generation of precursor metabolites and energy / intracellular protein transport / picornain 2A / symbiont-mediated suppression of host mRNA export from nucleus / symbiont genome entry into host cell via pore formation in plasma membrane / picornain 3C / T=pseudo3 icosahedral viral capsid / multicellular organism growth / DNA Damage/Telomere Stress Induced Senescence / host cell cytoplasmic vesicle membrane / fibrillar center / positive regulation of fibroblast proliferation / single-stranded DNA binding / nucleoside-triphosphate phosphatase / outer membrane-bounded periplasmic space / channel activity / monoatomic ion transmembrane transport / chromosome, telomeric region / DNA replication / RNA helicase activity / nuclear body / endocytosis involved in viral entry into host cell / symbiont-mediated activation of host autophagy / RNA-directed RNA polymerase / cysteine-type endopeptidase activity / viral RNA genome replication / RNA-directed RNA polymerase activity / intracellular membrane-bounded organelle / DNA-templated transcription / DNA damage response / protein-containing complex binding / virion attachment to host cell / host cell nucleus / structural molecule activity / ATP hydrolysis activity / proteolysis / RNA binding / zinc ion binding 類似検索 - 分子機能 | |||||||||
生物種 | ![]() ![]() ![]() ![]() ![]() synthetic construct (人工物) | |||||||||
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: 4.1 Å | |||||||||
![]() | Cai, S.W. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: POT1 recruits and regulates CST-Polα/primase at human telomeres. 著者: Sarah W Cai / Hiroyuki Takai / Arthur J Zaug / Teague C Dilgen / Thomas R Cech / Thomas Walz / Titia de Lange / ![]() 要旨: Telomere maintenance requires the extension of the G-rich telomeric repeat strand by telomerase and the fill-in synthesis of the C-rich strand by Polα/primase. At telomeres, Polα/primase is bound ...Telomere maintenance requires the extension of the G-rich telomeric repeat strand by telomerase and the fill-in synthesis of the C-rich strand by Polα/primase. At telomeres, Polα/primase is bound to Ctc1/Stn1/Ten1 (CST), a single-stranded DNA-binding complex. Like mutations in telomerase, mutations affecting CST-Polα/primase result in pathological telomere shortening and cause a telomere biology disorder, Coats plus (CP). We determined cryogenic electron microscopy structures of human CST bound to the shelterin heterodimer POT1/TPP1 that reveal how CST is recruited to telomeres by POT1. Our findings suggest that POT1 hinge phosphorylation is required for CST recruitment, and the complex is formed through conserved interactions involving several residues mutated in CP. Our structural and biochemical data suggest that phosphorylated POT1 holds CST-Polα/primase in an inactive, autoinhibited state until telomerase has extended the telomere ends. We propose that dephosphorylation of POT1 releases CST-Polα/primase into an active state that completes telomere replication through fill-in synthesis. #1: ジャーナル: bioRxiv / 年: 2023 タイトル: POT1 recruits and regulates CST-Polα/Primase at human telomeres. 著者: Sarah W Cai / Hiroyuki Takai / Thomas Walz / Titia de Lange / ![]() 要旨: Telomere maintenance requires extension of the G-rich telomeric repeat strand by telomerase and fill-in synthesis of the C-rich strand by Polα/Primase. Telomeric Polα/Primase is bound to Ctc1-Stn1- ...Telomere maintenance requires extension of the G-rich telomeric repeat strand by telomerase and fill-in synthesis of the C-rich strand by Polα/Primase. Telomeric Polα/Primase is bound to Ctc1-Stn1-Ten1 (CST), a single-stranded DNA-binding complex. Like mutations in telomerase, mutations affecting CST-Polα/Primase result in pathological telomere shortening and cause a telomere biology disorder, Coats plus (CP). We determined cryogenic electron microscopy structures of human CST bound to the shelterin heterodimer POT1/TPP1 that reveal how CST is recruited to telomeres by POT1. Phosphorylation of POT1 is required for CST recruitment, and the complex is formed through conserved interactions involving several residues mutated in CP. Our structural and biochemical data suggest that phosphorylated POT1 holds CST-Polα/Primase in an inactive auto-inhibited state until telomerase has extended the telomere ends. We propose that dephosphorylation of POT1 releases CST-Polα/Primase into an active state that completes telomere replication through fill-in synthesis. | |||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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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 | ![]() | 828.7 KB | 表示 | ![]() |
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PDB形式 | ![]() | 655.5 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 40660MC ![]() 8sojC 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 ![]() |
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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
-CST complex subunit ... , 3種, 3分子 ABC
#1: タンパク質 | 分子量: 178300.609 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() 遺伝子: malE, Z5632, ECs5017, CTC1, C17orf68 / 発現宿主: ![]() |
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#2: タンパク質 | 分子量: 42172.949 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
#3: タンパク質 | 分子量: 13872.013 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
-タンパク質 , 2種, 2分子 DE
#4: タンパク質 | 分子量: 72938.219 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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#5: タンパク質 | 分子量: 58064.863 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() 遺伝子: ACD, PIP1, PTOP, TINT1, TPP1 / 発現宿主: ![]() 参照: UniProt: B6F2F5, UniProt: Q96AP0, picornain 2A, nucleoside-triphosphate phosphatase, picornain 3C, RNA-directed RNA polymerase |
-DNA鎖 / 非ポリマー , 2種, 3分子 F

#6: DNA鎖 | 分子量: 5682.672 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) synthetic construct (人工物) |
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#7: 化合物 |
-詳細
研究の焦点であるリガンドがあるか | N |
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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: ssDNA-bound human CST-POT1(ESDL)/TPP1 complex / タイプ: COMPLEX / 詳細: CST-POT1(ESDL)/TPP1 complex in the presence of DNA / Entity ID: #1-#6 / 由来: RECOMBINANT |
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分子量 | 値: 0.37 MDa / 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() |
緩衝液 | pH: 7.5 |
試料 | 濃度: 0.02 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
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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: ![]() |
電子レンズ | モード: BRIGHT FIELD / 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 |
撮影 | 電子線照射量: 50.3 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
ソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||
3次元再構成 | 解像度: 4.1 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 76359 / 対称性のタイプ: POINT | ||||||||||||
精密化 | 交差検証法: NONE |