在Synechococcus elongatus PCC 7942中设计定数感应电路,以实现自我诱导系统
Emmanuel J Kokarakis1, María Santos-Merino2, Sajjad Ghaffarinasab3
1Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, 48824, United States; MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, MI, 48824, United States.
Metabolic engineering
|July 27, 2025
概括
工程菌现在具有定数感应 (QS) 功能,用于控制基因表达. 这一突破增强了生物质回收,为可扩展的生物生产应用铺平了道路.
科学领域:
- 合成生物学 合成生物学
- 微生物生物技术 微生物生物技术
- 菌研究的研究.
背景情况:
- 菌具有可持续生物生产的巨大潜力.
- 目前的局限性包括对生物反应器的适应性差,以及扩大生物质生长和收获的挑战.
- 需要自动诱导系统来协调基因表达与人口密度.
研究的目的:
- 探索异质微生物的定量感应 (QS) 途径,以自动诱导蓝藻细菌的基因表达.
- 为了设计Synechococcus elongatus PCC 7942,以产生和响应乙-同素乳 (AHL) 信号.
- 通过使用QS控制的系统来证明改进的生物质回收.
主要方法:
- 综合基因模块用于AHL信号的产生和检测在Synechococcus elongatus.
- 使用混合QS系统,将Lux (Vibrio fischeri) 和Las (Pseudomonas aeruginosa) 组件结合起来.
- 将QS通路与细胞分裂抑制剂 (cdv3) 基因的表达结合起来.
主要成果:
- 在Synechococcus elongatus中证明了剂量依赖和人口密度响应的基因表达.
- 确定了一个最佳的混合QS系统,可以减轻毒性.
- 实现了晚期细胞延长,增加了细胞沉积,并改善了生物质回收.
结论:
- 在蓝藻细菌中开发了一种基于定数感应的功能性自动诱导系统.
- 这种系统可以实现对人口密度敏感的基因表达和增强生物质恢复.
- 为推进蓝藻细菌生物技术和可扩展生物生产提供了基础.
相关概念视频
Gene Regulation in Microbial Communities: Quorum Sensing
93
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
93
Bacterial Signaling
34.2K
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...
34.2K
Global Regulatory Systems
74
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...
74
Gene Regulation During Sporulation
78
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
78
Coordination of Gene Expression Processes in Bacteria
150
The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
150
Stringent Response in E. coli
53
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...
53


