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
中科院分区:
文献类型:
--
作者:
Pokorzynski ND;Hatch ND;Ouellette SP;Carabeo RA
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.
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影响因子:
14.8
作者:
Kelley LA;Mezulis S;Yates CM;Wass MN;Sternberg MJ
通讯作者:
Sternberg MJ
DOI:
10.1016/s0002-9378(97)80020-8
发表时间:
1997-01-01
影响因子:
9.8
作者:
Hillis, SD;Owens, LM;MacKenzie, WR
通讯作者:
MacKenzie, WR
影响因子:
4.8
作者:
Fehlner-Gardiner, C;Roshick, C;McClarty, G
通讯作者:
McClarty, G
DOI:
10.1111/j.1749-6632.1994.tb44274.x
发表时间:
1994-01-01
期刊:
MICROBIAL PATHOGENESIS AND IMMUNE RESPONSE
影响因子:
--
作者:
BEATTY, WL;BELANGER, TA;BYRNE, GI
通讯作者:
BYRNE, GI
影响因子:
10.7
作者:
Domman D;Horn M
通讯作者:
Horn M