Related Experiment Video
Updated: Aug 16, 2025
12:24
DNA-affinity-purified Chip DAP-chip Method to Determine Gene Targets for Bacterial Two component Regulatory Systems
Published on: July 21, 2014
16.8K
A novel copper-sensing two-component system for inducing Dsb gene expression in bacteria.
Liang Yu1, Qiao Cao2, Weizhong Chen3
1University of Chinese Academy of Sciences, Beijing 100049, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
Science Bulletin
|December 22, 2022
Summary
Bacteria use a new DsbRS system to sense copper and regulate protein disulfide bond formation genes, protecting against copper toxicity. This mechanism is crucial for bacterial survival under copper stress.
Area of Science:
- Microbiology
- Bacterial Physiology
- Molecular Biology
Background:
- Bacteria require mechanisms to detect and respond to environmental copper levels to prevent toxicity.
- Copper homeostasis is essential for bacterial survival and pathogenesis.
- Two-component systems are critical for sensing environmental stimuli and regulating gene expression in bacteria.
Purpose of the Study:
- To identify and characterize a novel copper-responsive two-component system in Pseudomonas aeruginosa.
- To elucidate the regulatory mechanism of protein disulfide bond formation (Dsb) genes by the DsbRS system in response to copper.
- To investigate the distribution and conservation of the DsbRS-Dsb system in other bacterial species.
Main Methods:
- Identification and genetic manipulation of the DsbRS two-component system in Pseudomonas aeruginosa.
- Biochemical assays to determine the kinase/phosphatase activity of DsbS and its interaction with copper.
- Analysis of gene expression (transcription) of Dsb genes under varying copper concentrations.
- Bioinformatic analysis to identify homologous systems and regulatory sites in other bacteria.
Main Results:
- A novel copper-responsive two-component system, DsbRS, was identified in Pseudomonas aeruginosa, comprising sensor histidine kinase DsbS and response regulator DsbR.
- DsbS acts as a copper sensor; copper binding, particularly involving Cys82, inhibits its phosphatase activity towards DsbR, leading to Dsb gene activation.
- The dsbRS knockout mutant's copper resistance was restored by expressing the dsbDEG operon, a key target of DsbRS regulation.
- Homologous DsbRS-Dsb systems and conserved DsbR-binding sites were found across diverse eubacteria, suggesting a widespread regulatory mechanism.
Conclusions:
- The DsbRS two-component system represents a novel mechanism for bacterial copper sensing and stress response.
- Regulation of Dsb genes by DsbRS is critical for managing copper toxicity and maintaining protein homeostasis.
- The conserved nature of this system highlights its evolutionary importance in bacterial adaptation to copper-rich environments.
Related Concept Videos
01:28Gene Regulation in Microbial Communities: Quorum Sensing
67
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,...
67
01:28Global Regulatory Systems
59
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...
59
01:30Bacterial Signaling
33.5K
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...
33.5K
01:25Inducible Operons: lac Operon
88
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...
88
01:29Coordination of Gene Expression Processes in Bacteria
116
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...
116