The bacteriophage T4 AsiA protein contacts the β-flap domain of RNA polymerase

The bacteriophage T4 AsiA protein contacts the β-flap domain of RNA polymerase
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噬菌体 T4 AsiA 蛋白接触 RNA 聚合酶的 β-flap 结构域

DOI:
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发表时间:
2009
影响因子:
11.1
通讯作者:
A. Hochschild
A. Hochschild
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Andy H. Yuan;Bryce E. Nickels;A. Hochschild

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为了从特定启动子启动转录,细菌RNA聚合酶(RNAP)核心酶必须与起始因子σ结合,所述起始因子σ包含允许与启动子DNA序列特异性相互作用的决定簇。大多数细菌含有几个σ因子,每个因子指导识别一组不同的启动子。称为“抗σ因子”的蛋白质的大的且多样的家族通过靶向特异性σ因子来调节启动子利用。这个家族的创始成员是噬菌体T4的AsiA蛋白。AsiA特异性靶向大肠杆菌中的主要σ因子σ70,并抑制主要类别的σ70依赖性启动子的转录。AsiA依赖性转录抑制归因于AsiA与σ70保守区4之间的充分记录的相互作用。在这里,我们建立了有效的AsiA依赖性转录抑制也需要AsiA和RNAP核心之间的直接蛋白质-蛋白质接触。特别是,我们证明了AsiA接触RNAP β亚基的瓣结构域(β瓣)。我们的研究结果支持了一种新的观点,即β瓣是调节蛋白的靶位点,在转录周期的所有阶段影响RNAP功能。
To initiate transcription from specific promoters, the bacterial RNA polymerase (RNAP) core enzyme must associate with the initiation factor σ, which contains determinants that allow sequence-specific interactions with promoter DNA. Most bacteria contain several σ factors, each of which directs recognition of a distinct set of promoters. A large and diverse family of proteins known as “anti-σ factors” regulates promoter utilization by targeting specific σ factors. The founding member of this family is the AsiA protein of bacteriophage T4. AsiA specifically targets the primary σ factor in Escherichia coli, σ70, and inhibits transcription from the major class of σ70-dependent promoters. AsiA-dependent transcription inhibition has been attributed to a well-documented interaction between AsiA and conserved region 4 of σ70. Here, we establish that efficient AsiA-dependent transcription inhibition also requires direct protein–protein contact between AsiA and the RNAP core. In particular, we demonstrate that AsiA contacts the flap domain of the RNAP β-subunit (the β-flap). Our findings support the emerging view that the β-flap is a target site for regulatory proteins that affect RNAP function during all stages of the transcription cycle.
噬菌体 T4 AsiA 对大肠杆菌 RNA 聚合酶的抑制。
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