LtpA, a CdnL-type CarD regulator, is important for the enzootic cycle of the Lyme disease pathogen.

LtpA, a CdnL-type CarD regulator, is important for the enzootic cycle of the Lyme disease pathogen.
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LtpA 是一种 CdnL 型 CarD 调节因子,对于莱姆病病原体的地方性循环很重要

DOI:
10.1038/s41426-018-0122-1
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发表时间:
2018-07-09
影响因子:
13.2
通讯作者:
Yang XF
Yang XF
中科院分区:
医学2区
文献类型:
--
作者:
Chen T;Xiang X;Xu H;Zhang X;Zhou B;Yang Y;Lou Y;Yang XF

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关于莱姆病病原体伯氏疏螺旋体如何适应并在蜱虫载体中存活,人们知之甚少。我们先前鉴定了细菌CardD N-末端样(CdnL)蛋白,LtpA(BB 0355),inB。burgdorferi,优选在较低温度下表达,这是模拟B. burgdorferi。CdnL家族蛋白是一类新出现的细菌RNAP相互作用转录因子,对结核分枝杆菌和黄色粘球菌的生存至关重要。先前尝试灭活tpAinB。盗窃案没有成功。本研究报道了乙型肝炎病毒感染株altpA突变体的构建。burgdorferi,菌株B31- 5A 4 NP 1。与M中的CdnL不同。结核病和M. xanthus,LtpA对B. burgdorferi。然而,该突变体表现出降低的生长速率和冷敏感表型。我们证明LtpA正调控16 S rRNA的表达,这有助于在theltpA突变体的生长缺陷。TheltpA突变体仍然能够感染小鼠,尽管具有延迟感染。此外,该tpA突变体在蜱中产生显著降低的螺旋体负荷,并且不能通过蜱感染来感染小鼠。总的来说,LtpA代表了CdnL家族中的一种新的调节剂,在B的地方性循环中具有重要作用。burgdorferi。
Little is known about howBorrelia burgdorferi, the Lyme disease pathogen, adapts and survives in the tick vector. We previously identified a bacterial CarD N-terminal-like (CdnL) protein, LtpA (BB0355), inB. burgdorferithat is preferably expressed at lower temperatures, which is a surrogate condition mimicking the tick portion of the enzootic cycle ofB. burgdorferi. CdnL-family proteins, an emerging class of bacterial RNAP-interacting transcription factors, are essential for the viability ofMycobacterium tuberculosisandMyxococcus xanthus. Previous attempts to inactivateltpAinB. burgdorferihave not been successful. In this study, we report the construction of altpAmutant in the infectious strain ofB. burgdorferi, strain B31-5A4NP1. Unlike CdnL inM. tuberculosisandM. xanthus, LtpA is dispensable for the viability ofB. burgdorferi. However, theltpAmutant exhibits a reduced growth rate and a cold-sensitive phenotype. We demonstrate that LtpA positively regulates 16S rRNA expression, which contributes to the growth defects in theltpAmutant. TheltpAmutant remains capable of infecting mice, albeit with delayed infection. Additionally, theltpAmutant produces markedly reduced spirochetal loads in ticks and was not able to infect mice via tick infection. Overall, LtpA represents a novel regulator in the CdnL family that has an important role in the enzootic cycle ofB. burgdorferi.
DOI: 10.1371/journal.ppat.1002102
发表时间: 2011-07
期刊: PLoS pathogens
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