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Retrograde nuclear import of tRNA precursors is required for modified base biogenesis in yeast

机译:tRNA前体的逆行核导入是酵母中修饰的碱基生物发生所必需的

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The retrograde movement of tRNAs from the cytoplasm to the nucleus occurs constitutively in eukaryotic cells but its functional significance remains unclear. We show evidence suggesting that in Saccharomyces cerevisiae, a spliced tRNA precursor must be imported into the nucleus before the biogenesis of a modified base can occur. Wybutosine (yW) is a modified base adjacent to the anticodon of tRNA~(phe) and is required for accurate decoding. Glucose starvation or overexpression of the nuclear tRNA binding protein Trz1p both caused nuclear retention of cytoplasmic tRNAs, impaired the yW synthesis, and induced the accumulation of its intermediate, N~1-methylgunanosine (m~1G), showing that the post-spliced tRNA~(phe) is imported to the nucleus, where m~1G is formed by Trm5p, after which it is reexported to the cytoplasm, where the yW synthesis is completed by cytoplasmic enzymes.
机译:tRNA从细胞质向细胞核的逆行运动在真核细胞中组成性发生,但其功能意义尚不清楚。我们显示的证据表明,在酿酒酵母中,必须先将已剪接的tRNA前体导入核中,然后才能发生修饰碱基的生物发生。 Wybutosine(yW)是与tRNA_(phe)的反密码子相邻的修饰碱基,是准确解码所必需的。葡萄糖饥饿或核tRNA结合蛋白Trz1p的过表达均引起细胞质tRNA的核保留,削弱了yW合成,并诱导了其中间体N〜1-甲基古诺糖胺(m〜1G)的积累,表明剪接后的tRNA 〜(phe)导入细胞核,在那里Trm5p形成m〜1G,然后将其重新输出到细胞质,在那里yW合成由细胞质酶完成。

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