Integral nuclear pore proteins bind to Pol III-transcribed genes and are required for Pol III transcript processing in C. elegans.

Integral nuclear pore proteins bind to Pol III-transcribed genes and are required for Pol III transcript processing in C. elegans.
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DOI:
10.1016/j.molcel.2013.08.001
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发表时间:
2013-09-26
期刊:
影响因子:
16
通讯作者:
Lieb, Jason D.
Lieb, Jason D.
中科院分区:
生物学1区
文献类型:
--
作者:
Ikegami, Kohta;Lieb, Jason D.

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核孔与酵母中的活性蛋白质编码基因相关联,并涉及转录调控。在此,我们表明除了转录调控之外,秀丽隐杆线虫核孔的关键组分对于一部分由RNA聚合酶(Pol)III转录的小核仁RNA(snoRNAs)和tRNAs的加工是必需的。对两种核孔组成成分NPP - 13和NPP - 3以及输入蛋白β IMB - 1进行的染色质免疫沉淀提供了强有力的证据,表明这种需求是直接的。这三种蛋白质都特异性地与正在进行Pol III转录的tRNA和snoRNA基因相关联。这些核孔组分直接结合在Pol III预起始复合物的下游,但对于Pol III的招募不是必需的。相反,NPP - 13对于将tRNA和snoRNA前体切割成成熟RNA是必需的,而Pol II转录本的加工则正常进行。我们的数据表明,核孔组成蛋白在秀丽隐杆线虫中起到协调Pol III转录本的转录和加工的作用。
Nuclear pores associate with active protein-coding genes in yeast and have been implicated in transcriptional regulation. Here, we show that in addition to transcriptional regulation, key components of C. elegans nuclear pores are required for processing of a subset of small nucleolar RNAs (snoRNAs) and tRNAs transcribed by RNA Polymerase (Pol) III. Chromatin immunoprecipitation of NPP-13 and NPP-3, two integral nuclear pore components, and importin-β IMB-1, provides strong evidence that this requirement is direct. All three proteins associate specifically with tRNA and snoRNA genes undergoing Pol III transcription. These pore components bind immediately downstream of the Pol III pre-initiation complex, but are not required for Pol III recruitment. Instead, NPP-13 is required for cleavage of tRNA and snoRNA precursors into mature RNAs, whereas Pol II transcript processing occurs normally. Our data suggest that integral nuclear pore proteins act to coordinate transcription and processing of Pol III transcripts in C. elegans.
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