Differential interactions of the autonomous pathway RRM proteins and chromatin regulators in the silencing of Arabidopsis targets.

Differential interactions of the autonomous pathway RRM proteins and chromatin regulators in the silencing of Arabidopsis targets.
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DOI:
10.1371/journal.pone.0002733
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发表时间:
2008-07-16
期刊:
影响因子:
3.7
通讯作者:
Dean C
Dean C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bäurle I;Dean C

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我们最近发现了两个含有rrm型rna结合结构域的蛋白,FCA和FPA,最初通过它们在拟南芥基因组中的开花时间控制、沉默转座子和其他重复序列中的作用而被发现。在开花控制中,FCA和FPA在与保守的染色质调节因子、组蛋白去甲基化酶FLD和msi1同源物FVE(一种在许多染色质复合物中发现的保守的WD-repeat蛋白)的自主通路中发挥作用。在这里,我们研究了RRM蛋白如何在拟南芥基因组的一系列位点上与这些染色质调节因子相互作用。我们还研究了它们与DNA甲基化途径的相互作用。在一些情况下,RRM蛋白活性至少部分需要染色质调节因子来实现沉默。然而,在分析的每个靶点上,自主通路组分的相互作用是不同的,这很可能是由靶点位点和/或其他沉默通路的某些特性决定的。我们推测,RNA结合蛋白FCA和FPA是连接RNA识别和染色质沉默机制的转录组监测机制的一部分。
We have recently shown that two proteins containing RRM-type RNA-binding domains, FCA and FPA, originally identified through their role in flowering time control in Arabidopsis, silence transposons and other repeated sequences in the Arabidopsis genome. In flowering control, FCA and FPA function in the autonomous pathway with conserved chromatin regulators, the histone demethylase FLD and the MSI1-homologue FVE, a conserved WD-repeat protein found in many chromatin complexes. Here, we investigate how the RRM proteins interact genetically with these chromatin regulators at a range of loci in the Arabidopsis genome. We also investigate their interaction with the DNA methylation pathway. In several cases the RRM protein activity at least partially required a chromatin regulator to effect silencing. However, the interactions of the autonomous pathway components differed at each target analysed, most likely determined by certain properties of the target loci and/or other silencing pathways. We speculate that the RNA-binding proteins FCA and FPA function as part of a transcriptome surveillance mechanism linking RNA recognition with chromatin silencing mechanisms.
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