Architecture of eukaryotic mRNA 3'-end processing machinery.
Architecture of eukaryotic mRNA 3'-end processing machinery.
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真核mRNA 3'-End加工机械的建筑。
DOI:
10.1126/science.aao6535
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发表时间:
2017-11-24
期刊:
影响因子:
--
通讯作者:
Passmore LA
中科院分区:
文献类型:
--
作者:
Casañal A;Kumar A;Hill CH;Easter AD;Emsley P;Degliesposti G;Gordiyenko Y;Santhanam B;Wolf J;Wiederhold K;Dornan GL;Skehel M;Robinson CV;Passmore LA
Newly transcribed eukaryotic precursor messenger RNAs (pre-mRNAs) are processed at their 3’ ends by the ~1-megadalton multiprotein cleavage and polyadenylation factor (CPF). CPF cleaves pre-mRNAs, adds a polyadenylate tail, and triggers transcription termination, but it is unclear how its various enzymes are coordinated and assembled. Here, we show that the nuclease, polymerase, and phosphatase activities of yeast CPFare organized into threemodules. Using electron cryomicroscopy, we determined a 3.5-angstrom-resolution structure of the ~200-kilodalton polymerase module. This revealed four β propellers, in an assembly markedly similar to those of other protein complexes that bind nucleic acid. Combined with in vitro reconstitution experiments, our data show that the polymerase module brings together factors required for specific and efficient polyadenylation, to help coordinate mRNA 3′-end processing.
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