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
中科院分区:
文献类型:
--
作者:
Chen T;Xiang X;Xu H;Zhang X;Zhou B;Yang Y;Lou Y;Yang XF
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.
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