Interaction of T4 AsiA with its target sites in the RNA polymerase sigma70 subunit leads to distinct and opposite effects on transcription.

Interaction of T4 AsiA with its target sites in the RNA polymerase sigma70 subunit leads to distinct and opposite effects on transcription.
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T4 AsiA 与其 RNA 聚合酶 sigma70 亚基中的靶位点相互作用,会对转录产生不同且相反的影响。

DOI:
10.1016/s0022-2836(02)01442-0
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发表时间:
2003
影响因子:
5.6
通讯作者:
Severinov,Konstantin
Severinov,Konstantin
中科院分区:
生物学2区
文献类型:
--
作者:
Minakhin,Leonid;Niedziela-Majka,Anita;Kuznedelov,Konstantin;Adelman,Karen;Urbauer,JeffreyL;Heyduk,Tomasz;Severinov,Konstantin

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噬菌体T4 AsiA是一种同源二聚体蛋白,通过与大肠杆菌RNA聚合酶全酶(Eσ70)的σ 70亚基结合并阻止大多数大肠杆菌和早期T4启动子上的启动子复合物形成,协调从宿主和早期病毒转录到中期病毒转录的转换。此外,Eσ 70 AsiA,而不是Eσ70,是T4编码的DNA结合蛋白MotA转录激活的底物,MotA是来自中间病毒启动子的转录共激活因子。转录抑制所需的σ70-AsiA相互作用的分子决定簇位于σ 70保守区4.2中,该区域识别-35启动子共有元件。尚未确定MotA依赖性转录激活所必需的σ70-AsiA相互作用的分子决定簇。在此,我们发现在σ 70保守区4.2缺失的情况下,AsiA与σ 70保守区4.1相互作用并以非MotA依赖的方式激活转录。此外,我们表明AsiA二聚体必须解离才能与σ70的区域4.2或区域4.1相互作用。我们认为MotA可能通过限制AsiA与σ 70区域4.1的结合来共同激活转录。
Bacteriophage T4 AsiA is a homodimeric protein that orchestrates a switch from the host and early viral transcription to middle viral transcription by binding to the σ70subunit of Escherichia coli RNA polymerase holoenzyme (Eσ70) and preventing promoter complex formation on most E.coli and early T4 promoters. In addition, Eσ70AsiA, but not Eσ70, is a substrate of transcription activation by T4-encoded DNA-binding protein MotA, a co-activator of transcription from middle viral promoters. The molecular determinants of σ70–AsiA interaction necessary for transcription inhibition reside in the σ70conserved region 4.2, which recognizes the −35 promoter consensus element. The molecular determinants of σ70–AsiA interaction necessary for MotA-dependent transcription activation have not been identified. Here, we show that in the absence of σ70region 4.2, AsiA interacts with σ70conserved region 4.1 and activates transcription in a MotA-independent manner. Further, we show that the AsiA dimer must dissociate to interact with either region 4.2 or region 4.1 of σ70. We propose that MotA may co-activate transcription by restricting AsiA binding to σ70region 4.1.
噬菌体 T4 AsiA 对大肠杆菌 RNA 聚合酶的抑制。
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绘制大肠杆菌 RNA 聚合酶 sigma(70) 亚基和 T4 AsiA 之间的分子界面。
DOI: 10.1006/jmbi.2001.4445
发表时间: 2001
影响因子: 5.6
作者:
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