微RNA(miRNA)與信使RNA發(fā)生相互作用來抑制基因表達,。近日,刊登在國際著名雜志Nature上的一篇研究報告指出Argonaute蛋白在細胞核中的功能,。
Amy Pasquinelli及其同事現(xiàn)在報告,,miRNA還可以其他非編碼RNA為目標。在線蟲中,,結合到Argonaute蛋白ALG-1上的成熟的let-7 miRNA在let-7前體的3’端發(fā)生相互作用,,促進其處理,,形成一個正反饋環(huán)。
這一發(fā)現(xiàn)首次為miRNA-loaded的Argonaute蛋白在細胞核中確定了一個功能,。(生物谷Bioon.com)
doi:10.1038/nature11134
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Autoregulation of microRNA biogenesis by let-7 and Argonaute
Dimitrios G. Zisoulis Zoya S. Kai Roger K. Chang Amy E. Pasquinelli
MicroRNAs (miRNAs) comprise a large family of small RNA molecules that post-transcriptionally regulate gene expression in many biological pathways1. Most miRNAs are derived from long primary transcripts that undergo processing by Drosha to produce ~65-nucleotide precursors that are then cleaved by Dicer, resulting in the mature 22-nucleotide forms2, 3. Serving…