Mammalian WDR12 is a novel member of the Pes1-Bop1 complex and is required for ribosome biogenesis and cell proliferation.

Mammalian WDR12 is a novel member of the Pes1-Bop1 complex and is required for ribosome biogenesis and cell proliferation.
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DOI:
10.1083/jcb.200501141
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发表时间:
2005-08-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Eick D
Eick D
中科院分区:
其他
文献类型:
--
作者:
Hölzel M;Rohrmoser M;Schlee M;Grimm T;Harasim T;Malamoussi A;Gruber-Eber A;Kremmer E;Hiddemann W;Bornkamm GW;Eick D

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原癌基因c-myc的靶基因涉及细胞周期和生长控制,但两者之间的联系仍然是未知的。在这里,我们表明,核仁靶基因Pes 1和Bop 1的产品形成一个稳定的复合物与一个新的成员,WDR 12(PeBoW复合物)。内源性WDR 12是一种WD 40重复蛋白,对32 S前体核糖体RNA(rRNA)的加工和细胞增殖至关重要。此外,WDR 12的条件性表达的显性负突变体也阻断rRNA加工并诱导可逆的细胞周期停滞。突变体WDR 12在增殖细胞中以p19 ARF非依赖性方式触发p53积累,但在静止细胞中不触发。有趣的是,Pes 1-Bop 1-WDR 12在酵母中的潜在同源复合物(Nop 7 p-Erb 1 p-Ytm 1 p)参与控制核糖体生物合成和S期进入。总之,PeBoW复合物的完整性是哺乳动物细胞中核糖体生物发生和细胞增殖所必需的。
Target genes of the protooncogene c-myc are implicated in cell cycle and growth control, yet the linkage of both is still unexplored. Here, we show that the products of the nucleolar target genes Pes1 and Bop1 form a stable complex with a novel member, WDR12 (PeBoW complex). Endogenous WDR12, a WD40 repeat protein, is crucial for processing of the 32S precursor ribosomal RNA (rRNA) and cell proliferation. Further, a conditionally expressed dominant-negative mutant of WDR12 also blocks rRNA processing and induces a reversible cell cycle arrest. Mutant WDR12 triggers accumulation of p53 in a p19ARF-independent manner in proliferating cells but not in quiescent cells. Interestingly, a potential homologous complex of Pes1–Bop1–WDR12 in yeast (Nop7p–Erb1p–Ytm1p) is involved in the control of ribosome biogenesis and S phase entry. In conclusion, the integrity of the PeBoW complex is required for ribosome biogenesis and cell proliferation in mammalian cells.
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