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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: 9ij5 | ||||||
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タイトル | Cryo-EM Structure of MILI(K853A)-piRNA-target | ||||||
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![]() | RNA BINDING PROTEIN/RNA / Piwi protein / Pi-RNA / Argonaute / RNA BINDING PROTEIN-RNA complex | ||||||
機能・相同性 | ![]() perinucleolar chromocenter / PET complex / pi-body / secondary piRNA processing / transposable element silencing by mRNA destabilization / piRNA binding / piRNA-mediated gene silencing by mRNA destabilization / positive regulation of meiosis I / transposable element silencing by piRNA-mediated heterochromatin formation / piRNA processing ...perinucleolar chromocenter / PET complex / pi-body / secondary piRNA processing / transposable element silencing by mRNA destabilization / piRNA binding / piRNA-mediated gene silencing by mRNA destabilization / positive regulation of meiosis I / transposable element silencing by piRNA-mediated heterochromatin formation / piRNA processing / transposable element silencing by piRNA-mediated DNA methylation / transposable element silencing by heterochromatin formation / germ-line stem cell population maintenance / negative regulation of circadian rhythm / chromatoid body / dense body / positive regulation of cytoplasmic translation / P granule / regulatory ncRNA-mediated gene silencing / 加水分解酵素; エステル加水分解酵素; 5'-リン酸モノエステル産生エンドリボヌクレアーゼ / oogenesis / RNA endonuclease activity / meiotic cell cycle / rhythmic process / spermatogenesis / mRNA binding / metal ion binding / nucleus / cytosol / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() ![]() | ||||||
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 | ||||||
![]() | Li, Z.Q. / Xu, Q.K. / Wu, J.P. / Shen, E.Z. | ||||||
資金援助 | 1件
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![]() | ![]() タイトル: Structural insights into RNA cleavage by PIWI Argonaute. 著者: Zhiqing Li / Qikui Xu / Jing Zhong / Yan Zhang / Tianxiang Zhang / Xiaoze Ying / Xiaoli Lu / Xiaoyi Li / Li Wan / Junchao Xue / Jing Huang / Ying Zhen / Zhao Zhang / Jianping Wu / En-Zhi Shen / ![]() ![]() 要旨: Argonaute proteins are categorized into AGO and PIWI clades. Across most animal species, AGO-clade proteins are widely expressed in various cell types, and regulate normal gene expression. By ...Argonaute proteins are categorized into AGO and PIWI clades. Across most animal species, AGO-clade proteins are widely expressed in various cell types, and regulate normal gene expression. By contrast, PIWI-clade proteins predominantly function during gametogenesis to suppress transposons and ensure fertility. Both clades use nucleic acid guides for target recognition by means of base pairing, crucial for initiating target silencing, often through direct cleavage. AGO-clade proteins use a narrow channel to secure a tight guide-target interaction. By contrast, PIWI proteins feature a wider channel that potentially allows mismatches during pairing, broadening target silencing capability. However, the mechanism of PIWI-mediated target cleavage remains unclear. Here we demonstrate that after target binding, PIWI proteins undergo a conformational change from an 'open' state to a 'locked' state, facilitating base pairing and enhancing target cleavage efficiency. This transition involves narrowing of the binding channel and repositioning of the PIWI-interacting RNA-target duplex towards the MID-PIWI lobe, establishing extensive contacts for duplex stabilization. During this transition, we also identify an intermediate 'comma-shaped' conformation, which might recruit GTSF1, a known auxiliary protein that enhances PIWI cleavage activity. GTSF1 facilitates the transition to the locked state by linking the PIWI domain to the RNA duplex, thereby expediting the conformational change critical for efficient target cleavage. These findings explain the molecular mechanisms underlying PIWI-PIWI-interacting RNA complex function in target RNA cleavage, providing insights into how dynamic conformational changes from PIWI proteins coordinate cofactors to safeguard gametogenesis. | ||||||
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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 | ![]() | 197 KB | 表示 | ![]() |
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PDB形式 | ![]() | 147.3 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 | ![]() 60616MC ![]() 9iiyC ![]() 9iizC ![]() 9ij0C ![]() 9ij1C ![]() 9ij2C ![]() 9ij3C ![]() 9ij4C 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
#1: タンパク質 | 分子量: 109578.305 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() 参照: UniProt: Q8CDG1, 加水分解酵素; エステル加水分解酵素; 5'-リン酸モノエステル産生エンドリボヌクレアーゼ |
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#2: RNA鎖 | 分子量: 8262.972 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
#3: RNA鎖 | 分子量: 8016.773 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
#4: 化合物 | ChemComp-MG / |
研究の焦点であるリガンドがあるか | Y |
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: MILI(K853A)-piRNA-target / タイプ: COMPLEX / Entity ID: #1-#3 / 由来: RECOMBINANT | ||||||||||||
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由来(天然) |
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由来(組換発現) | 生物種: ![]() | ||||||||||||
緩衝液 | pH: 8 | ||||||||||||
試料 | 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: FEI TITAN 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): 2000 nm / 最小 デフォーカス(公称値): 1500 nm |
撮影 | 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: TFS FALCON 4i (4k x 4k) |
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解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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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: 93580 / 対称性のタイプ: POINT |