The iron-dependent repressor YtgR is a tryptophan-dependent attenuator of the trpRBA operon in Chlamydia trachomatis.

The iron-dependent repressor YtgR is a tryptophan-dependent attenuator of the trpRBA operon in Chlamydia trachomatis.
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铁依赖性阻遏物YtgR是沙眼衣原体中trpRBA操纵子的一种依赖于色氨酸的衰减剂。

DOI:
10.1038/s41467-020-20181-5
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发表时间:
2020-12-22
影响因子:
16.6
通讯作者:
Carabeo RA
Carabeo RA
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Pokorzynski ND;Hatch ND;Ouellette SP;Carabeo RA

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沙眼衣原体的trp操纵子的组织与其他模式细菌不同。它包含trpR,基因间区(IGR),以及生物合成的trpB和trpA开放阅读框。TrpR是调节主要启动子(PtrpR)的色氨酸依赖性阻遏物,而IGR具有替代启动子(PtrpBA)和铁依赖性阻遏物YtgR的操纵子序列以调节trpBA表达。在这里,我们报告说,YtgR阻遏在PtrpBA也依赖于色氨酸通过调节YtgR水平通过一个罕见的三重色氨酸基序(WWW)的YtgCR前体。在WWW基序处色氨酸限制期间抑制翻译随后促进ytgR的Rho非依赖性转录终止,从而去抑制PtrpBA。因此,YtgR代表了一种替代策略,以减弱trpBA的表达,扩大了剧目的trp操纵子衰减以外的TrpL和TRAP介导的机制,在其他细菌中描述。此外,重新利用铁依赖性阻遏物YtgR强调了维持trpRBA操纵子的色氨酸依赖性衰减的根本重要性。沙眼衣原体不具有TrpL介导的其trp操纵子的转录衰减。在这里,作者表明,铁依赖性调节剂,YtgR,作为一个色氨酸操纵子在这种生物体中的色氨酸依赖性衰减剂,由于YtgR水平的翻译调节通过三重色氨酸基序。
The trp operon of Chlamydia trachomatis is organized differently from other model bacteria. It contains trpR, an intergenic region (IGR), and the biosynthetic trpB and trpA open-reading frames. TrpR is a tryptophan-dependent repressor that regulates the major promoter (PtrpR), while the IGR harbors an alternative promoter (PtrpBA) and an operator sequence for the iron-dependent repressor YtgR to regulate trpBA expression. Here, we report that YtgR repression at PtrpBA is also dependent on tryptophan by regulating YtgR levels through a rare triple-tryptophan motif (WWW) in the YtgCR precursor. Inhibiting translation during tryptophan limitation at the WWW motif subsequently promotes Rho-independent transcription termination of ytgR, thereby de-repressing PtrpBA. Thus, YtgR represents an alternative strategy to attenuate trpBA expression, expanding the repertoire for trp operon attenuation beyond TrpL- and TRAP-mediated mechanisms described in other bacteria. Furthermore, repurposing the iron-dependent repressor YtgR underscores the fundamental importance of maintaining tryptophan-dependent attenuation of the trpRBA operon. Chlamydia trachomatis does not possess TrpL-mediated transcription attenuation of its trp operon. Here, the authors show that an iron-dependent regulator, YtgR, acts as a tryptophan-dependent attenuator of the trp operon in this organism, due to translational regulation of YtgR levels via a triple tryptophan motif.
DOI: 10.1038/nprot.2015.053
发表时间: 2015-06
期刊: Nature protocols
影响因子: 14.8
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