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首页> 外文期刊>EMBO reports >tRNA production links nutrient conditions to the onset of sexual differentiation through the TORC1 pathway
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tRNA production links nutrient conditions to the onset of sexual differentiation through the TORC1 pathway

机译:TRNA生产通过TORC1路径将营养条件联系起来的性分化的发作

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摘要

Target of rapamycin (TOR) kinase controls cell growth and metabolism in response to nutrient availability. In the fission yeast Schizosaccharomyces pombe, TOR complex 1 (TORC1) promotes vegetative growth and inhibits sexual differentiation in the presence of ample nutrients. Here, we report the isolation and characterization of mutants with similar phenotypes as TORC1 mutants, in that they initiate sexual differentiation even in nutrient-rich conditions. In most mutants identified, TORC1 activity is downregulated and the mutated genes are involved in tRNA expression or modification. Expression of tRNA precursors decreases when cells undergo sexual differentiation. Furthermore, overexpression of tRNA precursors prevents TORC1 downregulation upon nitrogen starvation and represses the initiation of sexual differentiation. Based on these observations, we propose that tRNA precursors operate in the S. pombe TORC1 pathway to switch growth mode from vegetative to reproductive.
机译:雷帕霉素(Tor)激酶的靶标在响应营养可用性时控制细胞生长和代谢。 在裂变酵母Schizosaccharomyces Pombe中,Tor Complex 1(Torc1)促进营养生长并抑制在充足的营养存在下的性分化。 在这里,我们报告了与Torc1突变体相似表型的突变体的分离和表征,因为它们即使在富含营养的条件下也引发性分化。 在确定的大多数突变体中,下调Torc1活性,并且突变的基因涉及TRNA表达或改性。 当细胞经历性分化时,TRNA前体的表达会降低。 此外,TRNA前体的过表达防止TORC1在氮饥饿时下调并抑制性分化的开始。 基于这些观察结果,我们提出了TRNA前体在S.Pombe Torc1路径中运行,以将生长模式切换到生殖中的生长。

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