首页> 外文期刊>Journal of Molecular Biology >The Spliceosomal Protein SF3B5 is a Novel Component of Drosophila SAGA that Functions in Gene Expression Independent of Splicing
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The Spliceosomal Protein SF3B5 is a Novel Component of Drosophila SAGA that Functions in Gene Expression Independent of Splicing

机译:剪接体蛋白SF3B5是果蝇SAGA的新型组件,其功能独立于剪接的基因表达。

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The interaction between splicing factors and the transcriptional machinery provides an intriguing link between the coupled processes of transcription and splicing. Here, we show that the two components of the SF3B complex, SF3B3 and SF3B5, that form part of the U2 small nuclear ribonucleoprotein particle (snRNP) are also subunits of the Spt-Ada-Gcn5 acetyltransferase (SAGA) transcriptional coactivator complex in Drosophila melanogaster. Whereas SF3B3 had previously been identified as a human SAGA subunit, SF3B5 had not been identified as a component of SAGA in any species. We show that SF3B3 and SF3B5 bind to SAGA independent of RNA and interact with multiple SAGA subunits including Sgf29 and Spt7 in a yeast two-hybrid assay. Through analysis of sf3b5 mutant flies, we show that SF3B5 is necessary for proper development and cell viability but not for histone acetylation. Although SF3B5 does not appear to function in SAGA's histone-modifying activities, SF3B5 is still required for expression of a subset of SAGA -regulated genes independent of splicing. Thus, our data support an independent function of SF3B5 in SAGA's transcription coactivator activity that is separate from its role in splicing. (C) 2016 Elsevier Ltd. All rights reserved.
机译:剪接因子与转录机制之间的相互作用为转录和剪接的耦合过程之间提供了有趣的联系。在这里,我们显示了SF3B复合物的两个成分,即SF3B3和SF3B5,它们构成了U2小核糖核蛋白颗粒(snRNP)的一部分,也是果蝇Spt-Ada-Gcn5乙酰基转移酶(SAGA)转录共激活复合物的亚基。 。 SF3B3先前已被鉴定为人SAGA亚基,而SF3B5尚未被鉴定为任何物种中SAGA的组成部分。我们显示SF3B3和SF3B5绑定到独立于RNA的SAGA并与多个SAGA亚基包括酵母双杂交检测中的Sgf29和Spt7相互作用。通过对sf3b5突变体果蝇的分析,我们表明SF3B5对于正常发育和细胞活力是必需的,但对于组蛋白乙酰化则不是必需的。尽管SF3B5似乎在SAGA的组蛋白修饰活动中不起作用,但仍需要SF3B5来表达独立于剪接的SAGA调控基因子集的表达。因此,我们的数据支持SF3B5在SAGA转录共激活因子活性中的独立功能,这与其在剪接中的作用是分开的。 (C)2016 Elsevier Ltd.保留所有权利。

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