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基本情報
登録情報 | データベース: PDB / ID: 8ag6 | |||||||||
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タイトル | human MutSalpha (MSH2/MSH6) binding to DNA with a GT mismatch | |||||||||
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![]() | DNA BINDING PROTEIN / DNA mismatch repair / MMR / MutSa / Lynch Syndrome | |||||||||
機能・相同性 | ![]() somatic recombination of immunoglobulin genes involved in immune response / MutSbeta complex / Defective Mismatch Repair Associated With MSH3 / MutSalpha complex / Defective Mismatch Repair Associated With MSH2 / Defective Mismatch Repair Associated With MSH6 / positive regulation of helicase activity / guanine/thymine mispair binding / somatic recombination of immunoglobulin gene segments / B cell mediated immunity ...somatic recombination of immunoglobulin genes involved in immune response / MutSbeta complex / Defective Mismatch Repair Associated With MSH3 / MutSalpha complex / Defective Mismatch Repair Associated With MSH2 / Defective Mismatch Repair Associated With MSH6 / positive regulation of helicase activity / guanine/thymine mispair binding / somatic recombination of immunoglobulin gene segments / B cell mediated immunity / maintenance of DNA repeat elements / meiotic mismatch repair / positive regulation of isotype switching to IgA isotypes / centromeric DNA binding / positive regulation of isotype switching to IgG isotypes / mitotic recombination / mismatched DNA binding / negative regulation of DNA recombination / isotype switching / Mismatch repair (MMR) directed by MSH2:MSH3 (MutSbeta) / Mismatch repair (MMR) directed by MSH2:MSH6 (MutSalpha) / oxidative phosphorylation / response to UV-B / postreplication repair / mitotic intra-S DNA damage checkpoint signaling / ATP-dependent DNA damage sensor activity / germ cell development / intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / ATP-dependent activity, acting on DNA / response to X-ray / somatic hypermutation of immunoglobulin genes / mismatch repair / response to UV / : / B cell differentiation / intrinsic apoptotic signaling pathway / determination of adult lifespan / TP53 Regulates Transcription of DNA Repair Genes / intrinsic apoptotic signaling pathway in response to DNA damage / male gonad development / double-strand break repair / spermatogenesis / negative regulation of neuron apoptotic process / in utero embryonic development / damaged DNA binding / chromosome, telomeric region / DNA repair / intracellular membrane-bounded organelle / chromatin binding / chromatin / enzyme binding / Golgi apparatus / protein homodimerization activity / ATP hydrolysis activity / DNA binding / nucleoplasm / ATP binding / nucleus / membrane / cytosol 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: 2.8 Å | |||||||||
![]() | Bruekner, S.R. / Sixma, T.K. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Unexpected moves: a conformational change in MutSα enables high-affinity DNA mismatch binding. 著者: Susanne R Bruekner / Wietske Pieters / Alexander Fish / A Manuel Liaci / Serge Scheffers / Emily Rayner / Daphne Kaldenbach / Lisa Drost / Marleen Dekker / Sandrine van Hees-Stuivenberg / ...著者: Susanne R Bruekner / Wietske Pieters / Alexander Fish / A Manuel Liaci / Serge Scheffers / Emily Rayner / Daphne Kaldenbach / Lisa Drost / Marleen Dekker / Sandrine van Hees-Stuivenberg / Elly Delzenne-Goette / Charlotte de Konink / Hellen Houlleberghs / Hendrikus Jan Dubbink / Abeer AlSaegh / Niels de Wind / Friedrich Förster / Hein Te Riele / Titia K Sixma / ![]() 要旨: The DNA mismatch repair protein MutSα recognizes wrongly incorporated DNA bases and initiates their correction during DNA replication. Dysfunctions in mismatch repair lead to a predisposition to ...The DNA mismatch repair protein MutSα recognizes wrongly incorporated DNA bases and initiates their correction during DNA replication. Dysfunctions in mismatch repair lead to a predisposition to cancer. Here, we study the homozygous mutation V63E in MSH2 that was found in the germline of a patient with suspected constitutional mismatch repair deficiency syndrome who developed colorectal cancer before the age of 30. Characterization of the mutant in mouse models, as well as slippage and repair assays, shows a mildly pathogenic phenotype. Using cryogenic electron microscopy and surface plasmon resonance, we explored the mechanistic effect of this mutation on MutSα function. We discovered that V63E disrupts a previously unappreciated interface between the mismatch binding domains (MBDs) of MSH2 and MSH6 and leads to reduced DNA binding. Our research identifies this interface as a 'safety lock' that ensures high-affinity DNA binding to increase replication fidelity. Our mechanistic model explains the hypomorphic phenotype of the V63E patient mutation and other variants in the MBD interface. | |||||||||
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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PDBx/mmCIF形式 | ![]() | 416.7 KB | 表示 | ![]() |
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PDB形式 | ![]() | 319.3 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 | ![]() 15417MC 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
-DNA mismatch repair protein ... , 2種, 2分子 AB
#1: タンパク質 | 分子量: 104861.875 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() 発現宿主: ![]() ![]() 参照: UniProt: P43246 |
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#2: タンパク質 | 分子量: 158767.312 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() 発現宿主: ![]() ![]() 参照: UniProt: P52701 |
-DNA鎖 , 2種, 2分子 EF
#3: DNA鎖 | 分子量: 15418.874 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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#4: DNA鎖 | 分子量: 15402.874 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) synthetic construct (人工物) |
-非ポリマー , 2種, 2分子 


#5: 化合物 | ChemComp-MG / |
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#6: 化合物 | ChemComp-ADP / |
-詳細
研究の焦点であるリガンドがあるか | N |
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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 |
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試料調製
構成要素 |
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分子量 |
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由来(天然) |
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由来(組換発現) |
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緩衝液 | pH: 7.5 | |||||||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.53 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES / 詳細: 2 uM MutSa with 2-fold excess DNA oligo | |||||||||||||||||||||||||||||||||||
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | |||||||||||||||||||||||||||||||||||
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 / 詳細: 3 s blotting with blot force 10 |
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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: FEI TITAN KRIOS 詳細: collected on Krios 1 at Netherlands Center for Electron Nanoscopy (NeCEN) |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 105000 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): 900 nm / Cs: 2.7 mm / C2レンズ絞り径: 50.000000001 µm |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 1.9 sec. / 電子線照射量: 50 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 1 / 実像数: 4821 |
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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 | ||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 5412220 | ||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 289289 / クラス平均像の数: 1 / 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 / 詳細: PDB-REDO webserver: https://pdb-redo.eu/ | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 2O8B Accession code: 2O8B / Source name: PDB / タイプ: experimental model |