Smad proteins bind a conserved RNA sequence to promote microRNA maturation by Drosha.
Smad proteins bind a conserved RNA sequence to promote microRNA maturation by Drosha.
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DOI:
10.1016/j.molcel.2010.07.011
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发表时间:
2010-08-13
期刊:
影响因子:
16
通讯作者:
Hata A
中科院分区:
文献类型:
--
作者:
Davis BN;Hilyard AC;Nguyen PH;Lagna G;Hata A
The signal transducers of the Transforming Growth Factor β (TGFβ)/Bone Morphogenetic Protein (BMP), the Smads, promote the expression of a subset of miRNAs by facilitating the cleavage reaction by Drosha. The mechanism that limits Smad-mediated processing to a selective group of miRNAs remained hitherto unexplored. In this study, we expand the number of TGFβ/BMP-regulated miRNAs (T/B-miRs) to 20. Interestingly, a majority of T/B-miRs contain a consensus sequence (R-SBE) within the stem region of the primary transcripts of T/B-miRs (pri-T/B-miRs). Here, we demonstrate that Smads directly bind the R-SBE. Mutation of the R-SBE abrogates TGFβ/BMP-induced recruitment of Smads, Drosha, and DGCR8 to pri-T/B-miRs, and impairs their processing, while introduction of R-SBE to unregulated pri-miRNAs is sufficient to recruit Smads and allow regulation by TGFβ/BMP. Thus, Smads are multifunctional proteins which modulate gene expression transcriptionally through DNA binding, and post-transcriptionally by pri-miRNA binding and regulation of miRNA processing.
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