ジャーナル: Mol Cell / 年: 2019 タイトル: Activation of the Endonuclease that Defines mRNA 3' Ends Requires Incorporation into an 8-Subunit Core Cleavage and Polyadenylation Factor Complex. 著者: Chris H Hill / Vytautė Boreikaitė / Ananthanarayanan Kumar / Ana Casañal / Peter Kubík / Gianluca Degliesposti / Sarah Maslen / Angelica Mariani / Ottilie von Loeffelholz / Mathias Girbig ...著者: Chris H Hill / Vytautė Boreikaitė / Ananthanarayanan Kumar / Ana Casañal / Peter Kubík / Gianluca Degliesposti / Sarah Maslen / Angelica Mariani / Ottilie von Loeffelholz / Mathias Girbig / Mark Skehel / Lori A Passmore / 要旨: Cleavage and polyadenylation factor (CPF/CPSF) is a multi-protein complex essential for formation of eukaryotic mRNA 3' ends. CPF cleaves pre-mRNAs at a specific site and adds a poly(A) tail. The ...Cleavage and polyadenylation factor (CPF/CPSF) is a multi-protein complex essential for formation of eukaryotic mRNA 3' ends. CPF cleaves pre-mRNAs at a specific site and adds a poly(A) tail. The cleavage reaction defines the 3' end of the mature mRNA, and thus the activity of the endonuclease is highly regulated. Here, we show that reconstitution of specific pre-mRNA cleavage with recombinant yeast proteins requires incorporation of the Ysh1 endonuclease into an eight-subunit "CPF" complex. Cleavage also requires the accessory cleavage factors IA and IB, which bind substrate pre-mRNAs and CPF, likely facilitating assembly of an active complex. Using X-ray crystallography, electron microscopy, and mass spectrometry, we determine the structure of Ysh1 bound to Mpe1 and the arrangement of subunits within CPF. Together, our data suggest that the active mRNA 3' end processing machinery is a dynamic assembly that is licensed to cleave only when all protein factors come together at the polyadenylation site.
根拠: gel filtration, co-expressed together and co-purified by affinity, anion exchange and gel filtration, assay for oligomerization, Pull-down assays (see paper), mass spectrometry, HDX and XL-MS ...根拠: gel filtration, co-expressed together and co-purified by affinity, anion exchange and gel filtration, assay for oligomerization, Pull-down assays (see paper), mass spectrometry, HDX and XL-MS experiments (see paper)
温度: 293 K / 手法: 蒸気拡散法, シッティングドロップ法 / pH: 8.7 詳細: 80 ul reservoir of 26 % w/v PEG 3000, 0.1 M CHES pH 8.7 The final drop of 400 nl comprised 200 nl protein and 200 nl crystallization buffer