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基本情報
登録情報 | データベース: PDB / ID: 9g8q | ||||||||||||||||||
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タイトル | 40S-bound human SKI238 complex in the open state (Gatekeeping module) | ||||||||||||||||||
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![]() | RIBOSOME / RNA-binding / RNA-degradation / cytoplasm / helicase | ||||||||||||||||||
機能・相同性 | ![]() Ski complex / mRNA decay by 3' to 5' exoribonuclease / Cdc73/Paf1 complex / nuclear-transcribed mRNA catabolic process, 3'-5' exonucleolytic nonsense-mediated decay / negative regulation of myeloid cell differentiation / 3'-5' RNA helicase activity / Association of TriC/CCT with target proteins during biosynthesis / nuclear-transcribed mRNA catabolic process / RNA Polymerase II Transcription Elongation / Formation of RNA Pol II elongation complex ...Ski complex / mRNA decay by 3' to 5' exoribonuclease / Cdc73/Paf1 complex / nuclear-transcribed mRNA catabolic process, 3'-5' exonucleolytic nonsense-mediated decay / negative regulation of myeloid cell differentiation / 3'-5' RNA helicase activity / Association of TriC/CCT with target proteins during biosynthesis / nuclear-transcribed mRNA catabolic process / RNA Polymerase II Transcription Elongation / Formation of RNA Pol II elongation complex / RNA Polymerase II Pre-transcription Events / rescue of stalled ribosome / transcription elongation by RNA polymerase II / euchromatin / Wnt signaling pathway / E3 ubiquitin ligases ubiquitinate target proteins / RNA helicase activity / RNA helicase / ATP hydrolysis activity / RNA binding / nucleoplasm / ATP 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: 4.1 Å | ||||||||||||||||||
![]() | Koegel, A. / Keidel, A. / Loukeri, M.J. / Kuhn, C.C. / Langer, L.M. / Schaefer, I.B. / Conti, E. | ||||||||||||||||||
資金援助 | ![]() ![]()
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![]() | ![]() タイトル: Structural basis of mRNA decay by the human exosome-ribosome supercomplex. 著者: Alexander Kögel / Achim Keidel / Matina-Jasemi Loukeri / Christopher C Kuhn / Lukas M Langer / Ingmar B Schäfer / Elena Conti / ![]() 要旨: The interplay between translation and mRNA decay is widespread in human cells. In quality-control pathways, exonucleolytic degradation of mRNA associated with translating ribosomes is mediated ...The interplay between translation and mRNA decay is widespread in human cells. In quality-control pathways, exonucleolytic degradation of mRNA associated with translating ribosomes is mediated largely by the cytoplasmic exosome, which includes the exoribonuclease complex EXO10 and the helicase complex SKI238 (refs. ). The helicase can extract mRNA from the ribosome and is expected to transfer it to the exoribonuclease core through a bridging factor, HBS1L3 (also known as SKI7), but the mechanisms of this molecular handover remain unclear. Here we reveal how human EXO10 is recruited by HBS1L3 (SKI7) to an active ribosome-bound SKI238 complex. We show that rather than a sequential handover, a direct physical coupling mechanism takes place, which culminates in the formation of a cytoplasmic exosome-ribosome supercomplex. Capturing the structure during active decay reveals a continuous path in which an RNA substrate threads from the 80S ribosome through the SKI2 helicase into the exoribonuclease active site of the cytoplasmic exosome complex. The SKI3 subunit of the complex directly binds to HBS1L3 (SKI7) and also engages a surface of the 40S subunit, establishing a recognition platform in collided disomes. Exosome and ribosome thus work together as a single structural and functional unit in co-translational mRNA decay, coordinating their activities in a transient supercomplex. | ||||||||||||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 339.4 KB | 表示 | ![]() |
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PDB形式 | ![]() | 251.5 KB | 表示 | ![]() |
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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 | ![]() 51136MC ![]() 9g8mC ![]() 9g8nC ![]() 9g8oC ![]() 9g8pC ![]() 9g8rC 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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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 137913.688 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: Q15477, 加水分解酵素; 酸無水物に作用; 酸無水物に作用・細胞または細胞小器官の運動に関与 | ||
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#2: タンパク質 | 分子量: 176064.750 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: Q6PGP7 | ||
#3: タンパク質 | 分子量: 33617.465 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() 発現宿主: ![]() ![]() 参照: UniProt: Q9GZS3 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: 40S-bound human SKI238 complex in the open state (Gatekeeping module) タイプ: RIBOSOME / Entity ID: all / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.4 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil R2/1 |
急速凍結 | 凍結剤: ETHANE-PROPANE |
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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): 2400 nm / 最小 デフォーカス(公称値): 600 nm |
撮影 | 電子線照射量: 64.2 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
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解析
EMソフトウェア | 名称: PHENIX / バージョン: 1.19.2_4158: / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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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: 53460 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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