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The FHA domain proteins DAWDLE in Arabidopsis and SNIP1 in humans act in small RNA biogenesis

机译:拟南芥中的FHA结构域蛋白DAWDLE和人类的SNIP1参与小RNA的生物发生

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摘要

Proteins containing the forkhead-associated domain (FHA) are known to act in biological processes such as DNA damage repair, protein degradation, and signal transduction. Here we report that DAWDLE (DDL), an FHA domain-containing protein in Arabidopsis, acts in the biogenesis of miRNAs and endogenous siRNAs. Unlike mutants of genes known to participate in the processing of miRNA precursors, such as dcl1, hyponastic leaves1, and serrate, ddl mutants show reduced levels of pri-miRNAs as well as mature miRNAs. Promoter activity of MIR genes, however, is not affected by ddl mutations. DDL is an RNA binding protein and is able to interact with DCL1. In addition, we found that SNIP1, the human homolog of DDL, is involved in miRNA biogenesis and interacts with Drosha. Therefore, we uncovered an evolutionarily conserved factor in miRNA biogenesis. We propose that DDL participates in miRNA biogenesis by facilitating DCL1 to access or recognize pri-miRNAs.
机译:已知含有叉头相关结构域(FHA)的蛋白质会在生物学过程中起作用,例如DNA损伤修复,蛋白质降解和信号转导。在这里,我们报告DAWDLE(DDL),拟南芥中的一个含FHA结构域的蛋白质,在miRNA和内源性siRNA的生物合成中起作用。不同于已知参与miRNA前体加工的基因的突变体,例如dcl1,鼻下叶和锯齿状,ddl突变体显示pri-miRNA和成熟miRNA的水平降低。但是,MIR基因的启动子活性不受ddl突变的影响。 DDL是一种RNA结合蛋白,能够与DCL1相互作用。此外,我们发现SNIP1,DDL的人类同源物,参与miRNA生物发生并与Drosha相互作用。因此,我们发现了miRNA生物发生中的进化保守因子。我们建议DDL通过促进DCL1访问或识别pri-miRNA参与miRNA生物发生。

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