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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: 9q9k | ||||||
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| タイトル | Cryo-EM structure of human Mre11-Rad50 (MR) complex bound to DNA and telomeric factor TRF2 fragment (438-542) | ||||||
要素 |
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キーワード | HYDROLASE / Mre11-Rad50-TRF2 complex / double-strand DNA break repair protein / nuclease | ||||||
| 機能・相同性 | 機能・相同性情報chromosomal region / axonal transport of messenger ribonucleoprotein complex / negative regulation of telomere single strand break repair / telomeric 3' overhang formation / negative regulation of telomere maintenance via recombination / telomeric loop formation / mitochondrial double-strand break repair via homologous recombination / Mre11 complex / negative regulation of double-strand break repair via nonhomologous end joining / negative regulation of telomere capping ...chromosomal region / axonal transport of messenger ribonucleoprotein complex / negative regulation of telomere single strand break repair / telomeric 3' overhang formation / negative regulation of telomere maintenance via recombination / telomeric loop formation / mitochondrial double-strand break repair via homologous recombination / Mre11 complex / negative regulation of double-strand break repair via nonhomologous end joining / negative regulation of telomere capping / BRCA1-C complex / meiotic DNA double-strand break formation / Sensing of DNA Double Strand Breaks / regulation of mitotic recombination / protection from non-homologous end joining at telomere / negative regulation of telomere maintenance via semi-conservative replication / negative regulation of telomeric D-loop disassembly / RNA-templated DNA biosynthetic process / R-loop processing / 加水分解酵素; 酸無水物に作用 / negative regulation of telomere maintenance / negative regulation of t-circle formation / single-stranded DNA endonuclease activity / homologous chromosome pairing at meiosis / regulation of telomere maintenance via telomerase / chromosome organization involved in meiotic cell cycle / telomeric D-loop disassembly / shelterin complex / Telomere C-strand synthesis initiation / DNA strand resection involved in replication fork processing / homologous recombination / double-stranded telomeric DNA binding / nuclease activity / G-quadruplex DNA binding / DNA double-strand break processing / single-stranded telomeric DNA binding / 3'-5'-DNA exonuclease activity / Telomere C-strand (Lagging Strand) Synthesis / mitotic G2/M transition checkpoint / nuclear telomere cap complex / G-rich strand telomeric DNA binding / Cytosolic sensors of pathogen-associated DNA / Impaired BRCA2 binding to PALB2 / HDR through MMEJ (alt-NHEJ) / telomere capping / telomere maintenance via recombination / IRF3-mediated induction of type I IFN / Polymerase switching on the C-strand of the telomere / Processive synthesis on the C-strand of the telomere / Removal of the Flap Intermediate from the C-strand / mitotic intra-S DNA damage checkpoint signaling / reciprocal meiotic recombination / regulation of telomere maintenance / protein localization to chromosome, telomeric region / negative regulation of telomere maintenance via telomere lengthening / sister chromatid cohesion / Homologous DNA Pairing and Strand Exchange / Defective homologous recombination repair (HRR) due to BRCA1 loss of function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA1 binding function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA2/RAD51/RAD51C binding function / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / HDR through Single Strand Annealing (SSA) / Resolution of D-loop Structures through Holliday Junction Intermediates / positive regulation of double-strand break repair / telomeric repeat DNA binding / Impaired BRCA2 binding to RAD51 / mitotic G2 DNA damage checkpoint signaling / negative regulation of telomere maintenance via telomerase / positive regulation of telomere maintenance / negative regulation of cellular senescence / Presynaptic phase of homologous DNA pairing and strand exchange / Telomere Extension By Telomerase / telomere maintenance via telomerase / 3'-5' exonuclease activity / 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 / replication fork / condensed nuclear chromosome / protein serine/threonine kinase activator activity / male germ cell nucleus / DNA endonuclease activity / Nonhomologous End-Joining (NHEJ) / G2/M DNA damage checkpoint / PML body / double-strand break repair via homologous recombination / DNA Damage/Telomere Stress Induced Senescence / double-strand break repair via nonhomologous end joining / HDR through Homologous Recombination (HRR) / Meiotic recombination / cellular senescence / double-strand break repair / manganese ion binding / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / site of double-strand break 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: 2.59 Å | ||||||
データ登録者 | Cui, H.J. / Lammens, K. / Hopfner, K.P. / Fan, Y.L. / Kuybu, F. | ||||||
| 資金援助 | ドイツ, 1件
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引用 | ジャーナル: Nat Commun / 年: 2025タイトル: Structural basis for DNA break sensing by human MRE11-RAD50-NBS1 and its regulation by telomeric factor TRF2. 著者: Yilan Fan / Filiz Kuybu / Hengjun Cui / Katja Lammens / Jia-Xuan Chen / Michael Kugler / Christophe Jung / Karl-Peter Hopfner / ![]() 要旨: The MRE11-RAD50-NBS1 (MRN) complex is a central, multifunctional factor in the detection, signaling and nucleolytic processing of DNA double-strand breaks (DSBs). To clarify how human MRN binds ...The MRE11-RAD50-NBS1 (MRN) complex is a central, multifunctional factor in the detection, signaling and nucleolytic processing of DNA double-strand breaks (DSBs). To clarify how human MRN binds generic and telomeric DNA ends and can separate DNA end sensing from nuclease activities, we determined cryo-electron microscopy (cryo-EM) structures of human MRN bound to DNA and to DNA and the telomere protection factor TRF2. MRN senses DSBs through a tight clamp-like sensing state with closed coiled-coil domains, but auto-inhibited MRE11 nuclease. NBS1 wraps around the MRE11 dimer, with NBS1's ATM recruitment motif sequestered by binding to the regulatory RAD50 S site, necessitating a switch in the NBS1 C helix for ATM activation. At telomeric DNA, TRF2 blocks the second S site via the iDDR motif to prevent nuclease and ATM activation. Our results provide a structural framework for DNA sensing via a gating mechanism and separation of sensing, signaling and processing activities of mammalian MRN. | ||||||
| 履歴 |
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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 | 9q9k.cif.gz | 473.7 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9q9k.ent.gz | 351.9 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9q9k.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/q9/9q9k ftp://data.pdbj.org/pub/pdb/validation_reports/q9/9q9k | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 52962MC ![]() 9q9hC ![]() 9q9iC ![]() 9q9jC ![]() 9q9mC 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 , 3種, 6分子 JKABDE
| #1: タンパク質 | 分子量: 12931.349 Da / 分子数: 2 / 由来タイプ: 組換発現 詳細: GP is the leftover sequence from PreScission cleavage site, and GGSSGGSSG is a linker sequence between the cleavage site and TRF2(438-542) fragment. 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: TERF2, TRBF2, TRF2 / 発現宿主: Trichoplusia ni (イラクサキンウワバ) / 参照: UniProt: Q15554#4: タンパク質 | 分子量: 154150.016 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: RAD50 / 発現宿主: Trichoplusia ni (イラクサキンウワバ) / 参照: UniProt: Q92878#5: タンパク質 | 分子量: 84032.680 Da / 分子数: 2 / 由来タイプ: 組換発現 詳細: Following residue R708 is a short GS linker, a PreScission cleavage site, and two FLAG tags. 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: MRE11, HNGS1, MRE11A / 発現宿主: Trichoplusia ni (イラクサキンウワバ)参照: UniProt: P49959, 加水分解酵素; エステル加水分解酵素 |
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-DNA鎖 , 2種, 2分子 PT
| #2: DNA鎖 | 分子量: 19423.369 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) Homo sapiens (ヒト) |
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| #3: DNA鎖 | 分子量: 20000.281 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) Homo sapiens (ヒト) |
-非ポリマー , 5種, 16分子 








| #6: 化合物 | | #7: 化合物 | #8: 化合物 | #9: 化合物 | ChemComp-MN / #10: 水 | ChemComp-HOH / | |
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-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: MR-TRF2(438-542)-DNA complex / タイプ: COMPLEX / Entity ID: #1-#5 / 由来: RECOMBINANT |
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| 分子量 | 値: 0.52 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: Trichoplusia ni (イラクサキンウワバ) |
| 緩衝液 | pH: 7.5 詳細: 25mM Hepes-NaOH, pH 7.5, 150 mM NaCl, 1 mM DTT, 1 mM ATP, 1mM BeF3, 5 mM MgCl2, 1 mM MnCl2 |
| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
| 試料支持 | 詳細: 20 mA, 7 s / グリッドの材料: COPPER / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil R2/1 |
| 急速凍結 | 装置: LEICA PLUNGER / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 283 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 / 最大 デフォーカス(公称値): 2600 nm / 最小 デフォーカス(公称値): 500 nm / Cs: 2.7 mm |
| 試料ホルダ | 凍結剤: NITROGEN |
| 撮影 | 電子線照射量: 40 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
| 電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / エネルギーフィルタースリット幅: 20 eV |
| 画像スキャン | 動画フレーム数/画像: 40 |
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解析
| EM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: 2.59 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 274928 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL | ||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | Source name: AlphaFold / タイプ: in silico model |
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万見について




Homo sapiens (ヒト)
ドイツ, 1件
引用









PDBj












































Trichoplusia ni (イラクサキンウワバ)
FIELD EMISSION GUN