9FMS

Cryo-EM structure of S. cerevisiae Rai1-Rat1-Rtt103(252-273) complex.

9FMS の概要

• エントリーDOI: 10.2210/pdb9fms/pdb
• 関連するPDBエントリー: 8Q6V 9EXS
• EMDBエントリー: 18199 50048 50566
• 分子名称: 5'-3' exoribonuclease 2, Regulator of Ty1 transposition protein 103, Decapping nuclease RAI1, ... (4 entities in total)
• 機能のキーワード: rai1 nuclease, rtt103 binding, structured, rna binding, rna binding protein
• 由来する生物種: Saccharomyces cerevisiae (brewer's yeast); 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 163135.08

構造登録者

Noskova, N.,Dikunova, A.,Stefl, R. (登録日: 2024-06-07, 公開日: 2024-12-18, 最終更新日: 2025-02-19)

主引用文献

Dikunova, A.,Noskova, N.,Overbeck, J.H.,Polak, M.,Stelzig, D.,Zapletal, D.,Kubicek, K.,Novacek, J.,Sprangers, R.,Stefl, R.
Assembly of the Xrn2/Rat1-Rai1-Rtt103 termination complexes in mesophilic and thermophilic organisms.
Structure, 33:300-, 2025

PubMed Abstract: The 5'-3' exoribonuclease Xrn2, known as Rat1 in yeasts, terminates mRNA transcription by RNA polymerase II (RNAPII). In the torpedo model of termination, the activity of Xrn2/Rat1 is enhanced by Rai1, which is recruited to the termination site by Rtt103, an adaptor protein binding to the RNAPII C-terminal domain (CTD). The overall architecture of the Xrn2/Rat1-Rai1-Rtt103 complex remains unknown. We combined structural biology methods to characterize the torpedo complex from Saccharomyces cerevisiae and Chaetomium thermophilum. Comparison of the structures from these organisms revealed a conserved protein core fold of the subunits, but significant variability in their interaction interfaces. We found that in the mesophile, Rtt103 utilizes an unstructured region to augment a Rai1 β-sheet, while in the thermophile Rtt103 binds to a C-terminal helix of Rai1 via its CTD-interacting domain with an α-helical fold. These different torpedo complex assemblies reflect adaptations to the environment and impact complex recruitment to RNAPII.

PubMed: 39657659
DOI: 10.1016/j.str.2024.11.010

実験手法

ELECTRON MICROSCOPY (2.65 Å)