A pseudouridine residue in the spliceosome core is part of the filamentous growth program in yeast.

A pseudouridine residue in the spliceosome core is part of the filamentous growth program in yeast.
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DOI:
10.1016/j.celrep.2014.07.004
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发表时间:
2014-08-21
期刊:
影响因子:
8.8
通讯作者:
Query CC
Query CC
中科院分区:
生物学1区
文献类型:
--
作者:
Basak A;Query CC

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虽然假尿苷碱基在tRNAs、rRNAs和SnRNAs中含量丰富,但尚不清楚它们在细胞分化中具有生理作用。我们在剪接体U6SnRNA上发现了一个新的假尿苷残基(Ψ28),它是在酿酒酵母丝状生长过程中诱导的。Pus1p催化这种修饰,并在丝化过程中上调。几个U6单链RNA突变体在Ψ28处有强烈的假脱氧核糖核酸;值得注意的是,这些U6突变体激活了伪菌丝生长,依赖于Pus1p,认为U6-Ψ28本身可以启动至少部分丝状生长程序,这一结论得到了针对U6-U28假脱氧核糖核酸的设计者snoRNA的证实。相反,阻断U6-U28假尿路的突变体抑制假菌丝生长。U6-U28伪尿素酶改变了次优内含子的剪接效率,因此,U6 SnRNA的Pus1p依赖的伪尿苷酸酶有助于丝状化生长程序。
Pseudouridine nucleobases, while abundant in tRNAs, rRNAs, and snRNAs, are not known to have physiologic roles in cell differentiation. We have identified a novel pseudouridine residue (Ψ28) on spliceosomal U6 snRNA that is induced during filamentous growth of Saccharomyces cerevisiae. Pus1p catalyzes this modification and is up-regulated during filamentation. Several U6 snRNA mutants are strongly pseudouridylated at Ψ28; remarkably, these U6 mutants activate pseudo-hyphal growth, dependent upon Pus1p, arguing that U6-Ψ28 per se can initiate at least part of the filamentous growth program, a conclusion confirmed using a designer snoRNA targeting U6-U28 pseudouridylation. Conversely, mutants that block U6-U28 pseudouridylation inhibit pseudo-hyphal growth. U6-U28 pseudouridylation changes the efficiency of splicing of suboptimal introns; thus, Pus1p-dependent pseudouridylation of U6 snRNA contributes to the filamentation growth program.
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