Hrp59, an hnRNP M protein in Chironomus and Drosophila, binds to exonic splicing enhancers and is required for expression of a subset of mRNAs.

Hrp59, an hnRNP M protein in Chironomus and Drosophila, binds to exonic splicing enhancers and is required for expression of a subset of mRNAs.
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DOI:
10.1083/jcb.200407173
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发表时间:
2005-03-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Visa N
Visa N
中科院分区:
其他
文献类型:
--
作者:
Kiesler E;Hase ME;Brodin D;Visa N

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在这里,我们研究了一种昆虫 hnRNP M 蛋白,称为 Hrp59。 Hrp59 相对丰富,具有包含三个 RNA 结合结构域的模块化结构域组织,动态招募到转录基因,并与前 mRNA 共转录结合。利用摇蚊的巴尔比亚尼环系统,我们发现Hrp59伴随着mRNA从基因到核膜,并在核孔处从mRNA中释放出来。 Hrp59 与转录基因的关联与合成 RNA 的量不成正比,并且体内 Hrp59 优先与 mRNA 的子集结合,包括其自身的 mRNA。通过 Hrp59-RNA 复合物的免疫共沉淀和与果蝇全基因组阵列的微阵列杂交,我们确定了体内 Hrp59 的首选 mRNA 靶标,并表明 Hrp59 是这些靶标 mRNA 表达所必需的。我们还表明,Hrp59 优先与外显子剪接增强子结合,我们的结果为 hnRNP M 在剪接调节中的作用提供了新的见解。
Here, we study an insect hnRNP M protein, referred to as Hrp59. Hrp59 is relatively abundant, has a modular domain organization containing three RNA-binding domains, is dynamically recruited to transcribed genes, and binds to premRNA cotranscriptionally. Using the Balbiani ring system of Chironomus, we show that Hrp59 accompanies the mRNA from the gene to the nuclear envelope, and is released from the mRNA at the nuclear pore. The association of Hrp59 with transcribed genes is not proportional to the amount of synthesized RNA, and in vivo Hrp59 binds preferentially to a subset of mRNAs, including its own mRNA. By coimmunoprecipitation of Hrp59–RNA complexes and microarray hybridization against Drosophila whole-genome arrays, we identify the preferred mRNA targets of Hrp59 in vivo and show that Hrp59 is required for the expression of these target mRNAs. We also show that Hrp59 binds preferentially to exonic splicing enhancers and our results provide new insights into the role of hnRNP M in splicing regulation.
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