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Interaction properties of human TRAMP-like proteins and their role in pre-rRNA 5 ' ETS turnover

机译:人类TRAMP样蛋白的相互作用特性及其在前rRNA 5'ETS周转中的作用

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摘要

In yeast, the Trf4/5-Air1/2-Mtr4 polyadenylation (TRAMP) complex acts as a cofactor for the nuclear exosome to promote degradation of various RNAs. However, the corresponding machinery in mammals is less characterized. We analyzed the interactions of the human TRAMP-like proteins, PAPD5, ZCCHC7, and MTR4, with the nuclear exosome. PAPD5 and ZCCHC7 exhibited mutual interactions in presence of the exosome catalytic subunit RRP6, whereas MTR4 was dispensable for their assembly. Furthermore, the human TRAMP-like proteins were involved in the RRP6-catalyzed turnover of pre-rRNA 5'ETS fragments. These results suggest the significant role for RRP6 in the assembly of TRAMP-like proteins during nucleolar RNA surveillance.
机译:在酵母中,Trf4 / 5-Air1 / 2-Mtr4聚腺苷酸化(TRAMP)复合物充当核外泌体的辅因子以促进各种RNA的降解。但是,哺乳动物中相应的机械特征较少。我们分析了人类TRAMP样蛋白,PAPD5,ZCCHC7和MTR4,与核外泌体的相互作用。 PAPD5和ZCCHC7在外泌体催化亚基RRP6的存在下表现出相互的相互作用,而MTR4对于它们的组装是必不可少的。此外,人类TRAMP样蛋白参与了RRP6催化的前rRNA 5'ETS片段的更新。这些结果表明,RRP6在核仁RNA监测过程中在TRAMP样蛋白的组装中起着重要作用。

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