Multimolecular proofreading overcomes the activity-fidelity trade-off.

Area of Science:

• Synthetic Biology
• Biophysics
• Biochemistry

Background:

• Accurate cellular signal processing relies on mechanisms like kinetic proofreading (KPR).
• KPR involves sequential enzyme state transitions and irreversible deactivation for high fidelity.
• Engineering single-molecular state transitions for synthetic KPR has been challenging.

Purpose of the Study:

• To design a novel protein circuit enabling kinetic proofreading at the multi-molecular level.
• To overcome the limitations of single-enzyme KPR and enzyme conservation assumptions.
• To develop a practical and generalizable strategy for constructing high-fidelity synthetic biological circuits.

Main Methods:

• Designed a protein circuit combining diffusion and endocytosis.
• Utilized computational simulations to analyze circuit behavior.
• Performed theoretical analysis to understand fundamental trade-offs.
• Integrated self-activation and mutual inhibition mechanisms.

Main Results:

• Demonstrated kinetic proofreading at the multi-molecular level without enzyme conservation.
• Identified a fundamental trade-off between circuit activity and fidelity.
• Developed a circuit that overcomes the activity-fidelity trade-off within biologically plausible parameters.
• Showcased a practical and generalizable strategy for synthetic biology.

Conclusions:

• The designed protein circuit extends proofreading schemes to a multi-molecular context.
• This approach offers a practical and generalizable strategy for building high-fidelity synthetic biological circuits.
• The findings have implications for advancing synthetic biology and understanding biological signal processing.