相关实验视频

Updated: May 30, 2025

Essential Components of Borreliella Borrelia burgdorferi In Vitro Transcription Assays

Essential Components of Borreliella Borrelia burgdorferi In Vitro Transcription Assays

Published on: July 22, 2022

在莱姆病病原体中,RpoS和BosR之间的正反调节

Sajith Raghunandanan¹, Raj Priya¹, Gaofeng Lin¹

¹Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA.

|January 28, 2025

概括

博雷利亚burgdorferi使用一个积极的反循环,其中RpoS调节BosR蛋白水平,而不是mRNA. 环境线索影响RpoS,间接影响BosR,揭示了莱姆病调节的新见解.

科学领域:

微生物学微生物学
分子生物学分子生物学
细菌病原体的产生

背景情况:

莱姆病病原体Borrelia burgdorferi依赖RpoS进行基因表达和在其动物性循环中的生存.
作为Fur/PerR同源的BosR调节了rpoS mRNA的稳定性,但其自身通过环境线索的调节尚不清楚.
了解这些调节机制是控制B. burgdorferi传播和感染的关键.

研究的目的:

调查Borrelia burgdorferi中RpoS和BosR之间的监管关系.
为了确定环境信号如何影响BosR水平.
阐明RpoS在调节BosR蛋白稳定性中的作用.

主要方法:

在B. burgdorferi中对rpoS进行遗传操纵 (突变,删除和人工诱导).
在各种条件下对BosR蛋白水平的定量分析.
评估 bosR mRNA 稳定性和周转率.
研究环境暗示对rpoS转录和rpoS生成的影响.

主要成果:

确定了一个积极的反循环,其中RpoS在转录后调节了BosR蛋白水平.
RpoS调节BosR蛋白循环,而不是BosRmRNA水平.
环境线索诱导rpoS转录,间接增加BosR蛋白水平.
失去或诱导rpoS显著影响BosR水平,证实了反循环.

结论:

通过转录后机制,RpoS积极调节BosR蛋白水平,特别是通过影响蛋白质周转.
环境信号主要通过调节RpoS活动来影响B. burgdorferi,这反过来影响BosR.
这项研究揭示了RpoN-RpoS通路中的新型调节层,挑战了现有的模型,并突出了B. burgdorferi适应的复杂性.

关键词:

波雷莉亚的形虫 (Borrelia burgdorferi) 是一种形虫.这就是 BosR BosR BosR.莱姆病是莱姆病的一种疾病.在RpoS中使用RpoS.传播的病原体

更多相关视频

Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research

Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research

Published on: August 31, 2013

Detecting the Lyme Disease Spirochete, Borrelia Burgdorferi, in Ticks Using Nested PCR

Detecting the Lyme Disease Spirochete, Borrelia Burgdorferi, in Ticks Using Nested PCR

Published on: February 4, 2018

相关概念视频

Cell Signaling Feedback Loops

Cell Signaling Feedback Loops

Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...

Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

Types of RNA

Types of RNA

Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...

Transcription Attenuation in Prokaryotes

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...

Bacterial Signaling

Bacterial Signaling

Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...

Bacterial RNA Polymerase

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...