- EMDB-17895: Chaetomium thermophilum pre-60S State 3 - post-5S rotation with R... -
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基本情報
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データベース: EMDB / ID: EMD-17895
タイトル
Chaetomium thermophilum pre-60S State 3 - post-5S rotation with Rix1 complex with Foot - local refinement - (Rix1)2-(Ipi3)2
マップデータ
Chaetomium thermophilum pre-60S State 3 - post-5S rotation with Rix1 complex with Foot - local refinement - (Rix1)2-(Ipi3)2 - local resolution filtered
試料
複合体: Chaetomium thermophilum pre-60S State 3 - post-5S rotation with Rix1 complex with Foot - local refinement - (Rix1)2-(Ipi3)2
ジャーナル: EMBO Rep / 年: 2023 タイトル: Structural insights into coordinating 5S RNP rotation with ITS2 pre-RNA processing during ribosome formation. 著者: Matthias Thoms / Benjamin Lau / Jingdong Cheng / Lisa Fromm / Timo Denk / Nikola Kellner / Dirk Flemming / Paulina Fischer / Laurent Falquet / Otto Berninghausen / Roland Beckmann / Ed Hurt / 要旨: The rixosome defined in Schizosaccharomyces pombe and humans performs diverse roles in pre-ribosomal RNA processing and gene silencing. Here, we isolate and describe the conserved rixosome from ...The rixosome defined in Schizosaccharomyces pombe and humans performs diverse roles in pre-ribosomal RNA processing and gene silencing. Here, we isolate and describe the conserved rixosome from Chaetomium thermophilum, which consists of two sub-modules, the sphere-like Rix1-Ipi3-Ipi1 and the butterfly-like Las1-Grc3 complex, connected by a flexible linker. The Rix1 complex of the rixosome utilizes Sda1 as landing platform on nucleoplasmic pre-60S particles to wedge between the 5S rRNA tip and L1-stalk, thereby facilitating the 180° rotation of the immature 5S RNP towards its mature conformation. Upon rixosome positioning, the other sub-module with Las1 endonuclease and Grc3 polynucleotide-kinase can reach a strategic position at the pre-60S foot to cleave and 5' phosphorylate the nearby ITS2 pre-rRNA. Finally, inward movement of the L1 stalk permits the flexible Nop53 N-terminus with its AIM motif to become positioned at the base of the L1-stalk to facilitate Mtr4 helicase-exosome participation for completing ITS2 removal. Thus, the rixosome structure elucidates the coordination of two central ribosome biogenesis events, but its role in gene silencing may adapt similar strategies.
ダウンロード / ファイル: emd_17895.map.gz / 形式: CCP4 / 大きさ: 476.8 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Chaetomium thermophilum pre-60S State 3 - post-5S rotation with Rix1 complex with Foot - local refinement - (Rix1)2-(Ipi3)2 - local resolution filtered