A Synthetic Circuit for Mercury Bioremediation Using Self-Assembling Functional Amyloids

Area of Science:

• Synthetic biology
• Environmental science
• Biotechnology

Background:

• Anthropogenic mercury pollution poses a significant threat to ecosystems and food chains.
• Bioremediation using biological systems offers a sustainable environmental management strategy.
• Current methods for mercury sequestration face limitations in efficiency and scope.

Purpose of the Study:

• To engineer bacterial biofilms capable of detecting and sequestering mercury ions (Hg²⁺).
• To develop a programmable living material for autonomous heavy metal absorption.
• To explore the potential of synthetic biology in environmental remediation.

Main Methods:

• Genetic engineering of bacteria to integrate a mercury-responsive promoter.
• Incorporation of an operon encoding a mercury-absorbing extracellular protein nanofiber.
• Development of self-assembling bacterial biofilms for mercury sequestration.

Main Results:

• Successfully engineered bacteria that detect Hg²⁺ ions in the environment.
• Demonstrated the ability of programmed biofilms to sequester toxic mercury ions.
• Established a proof-of-concept for self-assembling, autonomous heavy-metal absorbent materials.

Conclusions:

• Programmed bacterial biofilms represent a novel and effective tool for mercury bioremediation.
• This synthetic biology approach enables the creation of on-demand living materials for environmental cleanup.
• The developed technology holds promise for autonomous heavy metal absorption and environmental stewardship.