The C-terminus of Utp4, mutated in childhood cirrhosis, is essential for ribosome biogenesis.

The C-terminus of Utp4, mutated in childhood cirrhosis, is essential for ribosome biogenesis.
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DOI:
10.1093/nar/gkq185
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发表时间:
2010-08
影响因子:
14.9
通讯作者:
Baserga SJ
Baserga SJ
中科院分区:
生物学2区
文献类型:
--
作者:
Freed EF;Baserga SJ

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小亚基(SSU)加工体是核糖体的18 S rRNA成熟所需的大核糖核蛋白。最近,在SSU加工体蛋白,Utp 4/Cirhin的C-末端的错义突变,据报道,导致北美印第安儿童肝硬化(NAIC)。在这项研究中,我们使用酿酒酵母作为一个模型,研究NAIC突变在核糖体生物合成中的作用。虽然我们发现同源NAIC突变不会导致酵母中的生长缺陷或异常核糖体生物合成,但我们表明Utp 4的完整C末端是细胞生长和18 S和25 S rRNA成熟所必需的。一个蛋白质-蛋白质相互作用图的七蛋白t-Utp亚复合物,其中Utp 4是一个成员显示,Utp 8与Utp 4的C-末端相互作用,这种相互作用是必不可少的SSU加工组的组装和Utp 4在核糖体生物发生的功能。此外,这些结果使我们能够提出NAIC可能是由于Utp 4/Cirhin的C-末端与另一种SSU加工体蛋白之间的相互作用丧失而引起的前核糖体组装功能障碍。
The small subunit (SSU) processome is a large ribonucleoprotein that is required for maturation of the 18S rRNA of the ribosome. Recently, a missense mutation in the C-terminus of an SSU processome protein, Utp4/Cirhin, was reported to cause North American Indian childhood cirrhosis (NAIC). In this study, we use Saccharomyces cerevisiae as a model to investigate the role of the NAIC mutation in ribosome biogenesis. While we find that the homologous NAIC mutation does not cause growth defects or aberrant ribosome biogenesis in yeast, we show that an intact C-terminus of Utp4 is required for cell growth and maturation of the 18S and 25S rRNAs. A protein–protein interaction map of the seven-protein t-Utp subcomplex of which Utp4 is a member shows that Utp8 interacts with the C-terminus of Utp4 and that this interaction is essential for assembly of the SSU processome and for the function of Utp4 in ribosome biogenesis. Furthermore, these results allow us to propose that NAIC may be caused by dysfunctional pre-ribosome assembly due to the loss of an interaction between the C-terminus of Utp4/Cirhin and another SSU processome protein.
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发表时间: 2009-11-01
影响因子: 3.7
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