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The conserved protein Seb1 drives transcription termination by binding RNA polymerase II and nascent RNA #MMPMID28367989
Wittmann S; Renner M; Watts BR; Adams O; Huseyin M; Baejen C; El Omari K; Kilchert C; Heo DH; Kecman T; Cramer P; Grimes JM; Vasiljeva L
Nat Commun 2017[]; 8 (ä): ä PMID28367989show ga
Termination of RNA polymerase II (Pol II) transcription is an important step in the transcription cycle, which involves the dislodgement of polymerase from DNA, leading to release of a functional transcript. Recent studies have identified the key players required for this process and showed that a common feature of these proteins is a conserved domain that interacts with the phosphorylated C-terminus of Pol II (CTD-interacting domain, CID). However, the mechanism by which transcription termination is achieved is not understood. Using genome-wide methods, here we show that the fission yeast CID-protein Seb1 is essential for termination of protein-coding and non-coding genes through interaction with S2-phosphorylated Pol II and nascent RNA. Furthermore, we present the crystal structures of the Seb1 CTD- and RNA-binding modules. Unexpectedly, the latter reveals an intertwined two-domain arrangement of a canonical RRM and second domain. These results provide important insights into the mechanism underlying eukaryotic transcription termination.