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首页> 外文期刊>Molecular and Cellular Biology >The Drosophila Poly(A) Binding Protein-Interacting Protein, dPaip2, Is a Novel Effector of Cell Growth
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The Drosophila Poly(A) Binding Protein-Interacting Protein, dPaip2, Is a Novel Effector of Cell Growth

机译:果蝇聚(A)结合蛋白相互作用蛋白,dPaip2,是细胞生长的新型效应器。

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The 3′ poly(A) tail of eukaryotic mRNAs and the poly(A) binding protein (PABP) play important roles in the regulation of translation. Recently, a human PABP-interacting protein, Paip2, which disrupts the PABP-poly(A) interaction and consequently inhibits translation, was described. To gain insight into the biological role of Paip2, we studied the Drosophila melanogaster Paip2 (dPaip2). dPaip2 is the bona fide human Paip2 homologue, as it interacts with dPABP, inhibits binding of dPABP to the mRNA poly(A) tail, and reduces translation of a reporter mRNA by ~80% in an S2 cell-free translation extract. Ectopic overexpression of dPaip2 in Drosophila wings and wing discs results in a size reduction phenotype, which is due to a decrease in cell number. Clones of cells overexpressing dPaip2 in wing discs also contain fewer cells than controls. This phenotype can be explained by a primary effect on cell growth. Indeed, overexpression of dPaip2 in postreplicative tissues inhibits growth, inasmuch as it reduces ommatidia size in eyes and cell size in the larval fat body. We conclude that dPaip2 inhibits cell growth primarily by inhibiting protein synthesis.
机译:真核mRNA的3'poly(A)尾巴和poly(A)结合蛋白(PABP)在翻译调控中起重要作用。最近,描述了一种人PABP相互作用蛋白Paip2,它破坏了PABP-poly(A)的相互作用并因此抑制了翻译。为了深入了解Paip2的生物学作用,我们研究了果蝇(Drosophila melanogaster) Paip2(dPaip2)。 dPaip2是真正的人类Paip2同源物,因为它与dPABP相互作用,抑制dPABP与mRNA poly(A)尾部的结合,并在无S2细胞的翻译提取物中将报告mRNA的翻译降低了约80%。果蝇翼和翼盘中dPaip2的异位过表达导致大小减少表型,这是由于细胞数量减少所致。机翼圆盘中过度表达dPaip2的细胞克隆也比对照组含有更少的细胞。该表型可以通过对细胞生长的主要作用来解释。实际上,dPaip2在复制后组织中的过表达抑制了生长,因为它减少了眼睛的眼孔大小和幼虫脂肪体内的细胞大小。我们得出的结论是,dPaip2主要通过抑制蛋白质合成来抑制细胞生长。

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