多个细胞调节剂对Escherichia coli中的curli基因表达的影响
Maryia Ratnikava1, Olga Lamprecht1, Victor Sourjik1
1Max Planck Institute for Terrestrial Microbiology and Center for Synthetic Microbiology (SYNMIKRO), Marburg, Germany.
Journal of bacteriology
|November 12, 2025
概括
的粉样纤维对大肠杆菌生物膜至关重要. 这项研究揭示了多种因素,包括应激反应和DNA结构,调节曲基因表达,解释其在浮游生物细胞中的双模模式.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 细菌生理学 细菌生理学
背景情况:
- 库里粉样纤维是Escherichia coli*生物膜形成的细胞外基因组件的重要组成部分.
- 库利基因表达是复杂的,受到环境因素的影响,并且已知在大肠杆菌种群中表现出双模性表达模式.
- 之前关于卷曲调节的研究使用了各种条件和菌株,需要进行系统的单细胞研究.
研究的目的:
- 系统地研究调节 *csgBA* (曲线结构基因) 在浮游生物 *E. coli* 中单细胞水平表达的因素.
- 为了确定主转录因子CsgD的上游活动的调节者.
- 为了阐明Curli基因表达的双模式背后的机制.
主要方法:
- 在浮游生物大肠杆菌培养中对*csgBA*基因表达的单细胞分析.
- 系统地调查各种影响卷发产生的细胞因素.
- 识别调节途径和关键的转录因子,涉及到Curli基因表达双模式.
主要成果:
- 发现多种因素,包括应激反应,运动,新陈代谢,DNA结构和信号通路,可以促进或抑制*csgBA*表达.
- 确定了在CsgD上游活动的特定监管机构.
- 这项研究表明,曲线基因的双模式表达需要转录因子和染色体组织蛋白的相互作用,而不是第二信使信号.
结论:
- 在浮游生物大肠杆菌 (E. coli) 中,Curli 基因表达是由复杂的细胞因子网络微调的.
- 在卷曲表达中观察到的双模式主要是由涉及转录因子和DNA组织的调节相互作用驱动的.
- 了解这些调节机制对于理解 *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae* *Enterobacteriaceae*
相关概念视频
Stringent Response in E. coli
277
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
277
Global Regulatory Systems
578
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
578
Inducible Operons: lac Operon
1.3K
The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
1.3K
Constitutive and Regulated Gene Expression
896
Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
896
Regulation of Expression at Multiple Steps
1.3K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.3K
Prokaryotic Transcriptional Activators and Repressors
25.1K
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...
Transcription of prokaryotic...
25.1K


