在Streptomyces中,对代谢途径的动态控制进行表征和工程拉姆诺斯诱导的调节系统
Qian Yang1, Mengao Luan1, Meiyan Wang1
1College of Agronomy and Biotechnology, Southwest University, Chongqing 400715, China.
ACS synthetic biology
|October 8, 2024
概括
科学家们为Streptomyces开发了新的拉姆诺斯诱导基因表达系统 (rhaRS1和rhaRS2) . 这些系统能够精确控制基因活动,促进生产有价值的天然产品.
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
- 基因调节 基因调节
背景情况:
- 链杆菌是天然产品的关键生产者,需要先进的基因表达控制.
- 现有的Streptomyces的基因诱导系统需要进一步开发以更广泛的应用.
研究的目的:
- 为Streptomyces开发新的,严格规范的,可诱导拉姆诺斯的基因表达系统.
- 扩大合成生物学工具包,用于操纵Streptomyces物种的基因表达.
主要方法:
- 生物信息分析以识别拉姆诺斯催化途径和RhaR调节器.
- 电泳运动转移测试 (EMSAs) 用于确定RhaR操作员序列 (rhaO).
- 合成生物学方法使用RhaR/rhaO和一个构成性促进体来构建可诱导Rhamnose的系统 (rhaRS1,rhaRS2).
主要成果:
- 确定了一个保存的RhaR运算符序列 (rhaO).
- 构建的rhaRS1和rhaRS2系统表现出高诱导的记者活动,没有泄漏的表达.
- rhaRS2系统成功实现了Streptomyces中可编程生成actinorhodin和violacein的系统.
结论:
- 针对Streptomyces的新型拉姆诺斯诱导系统 (rhaRS1,rhaRS2) 已成功开发出来.
- 这些系统提供精确的基因表达控制,适用于其他Streptomyces物种.
- 扩展的工具包将促进合成生物技术在Streptomyces中的应用.
相关概念视频
01:28Global Regulatory Systems
5
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...
5
01:27Constitutive and Regulated Gene Expression
2
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...
2
01:29Translational Regulation
5
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
5
01:23Transcriptional Regulation: Riboswitches
7
Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
7
01:23Operon Model
3
The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
3
01:25Inducible Operons: lac Operon
10
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...
10