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Updated: Feb 9, 2026

DNA-affinity-purified Chip DAP-chip Method to Determine Gene Targets for Bacterial Two component Regulatory Systems
Published on: July 21, 2014
Refactoring two-component systems for tunable gene expression regulation and upgraded bacterial sensing.
Sheng-Yan Chen1, Haoran Xu2, Xinyi Wan3
1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China; ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, China; School of Chemistry and Chemical Engineering, State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China.
This study refactors two-component systems (TCSs), revealing response regulators (RRs) and histidine kinases (HKs) as key for programmability. Engineered TCS sensors offer ultrasensitive detection and improved biosensor performance.
Area of Science:
- Synthetic Biology
- Molecular Biology
- Biochemistry
Background:
- Two-component systems (TCSs) are vital signal transduction pathways in prokaryotes.
- Their potential in synthetic biology is limited by underexplored programmability.
- Understanding the roles of response regulators (RRs) and histidine kinases (HKs) is crucial.
Purpose of the Study:
- To systematically elucidate the functional properties of RRs and HKs in TCSs.
- To engineer ultrasensitive TCS-based biosensors with tunable thresholds.
- To develop novel sensing systems by integrating TCSs with other genetic circuits.
Main Methods:
- Refactoring TCSs to decouple histidine kinase (HK) expression.
- Engineering response regulator (RR) as a transducer.
- Coupling TCSs with one-component systems (OCS) to create synergistic sensing systems (SSS).
Main Results:
- Identified RRs as concentration-dependent activators and HKs as inhibitors in TCSs.
- Engineered ultrasensitive TCS sensors with adjustable detection limits.
- Developed a synergistic sensing system (SSS) with low detection limits and high dynamic range.
- Demonstrated RRs function as biological low-noise amplifiers (LNAs) for biosensors.
Conclusions:
- TCSs exhibit high plasticity and programmability for synthetic circuit design.
- This work provides modular toolkits for optimizing biosensors.
- The findings enable customized gene expression regulation in synthetic biology applications.
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