Design of a DNA-Programmed Plasminogen Activator

Area of Science:

• Biochemistry
• Molecular Biology
• Enzyme Engineering

Background:

• Enzyme activity control is crucial for therapeutic applications.
• Current methods for enzyme spatial and temporal regulation are limited.
• Streptokinase (SK) is a clinically used enzyme for dissolving blood clots.

Purpose of the Study:

• To develop a method for programming and controlling the fibrinolytic activity of streptokinase (SK).
• To demonstrate temporal and dose-dependent regulation of enzyme function using DNA-linked modifications.
• To advance the development of programmable enzyme therapeutics.

Main Methods:

• Engineered streptokinase (SK) with an intrasteric regulatory feature.
• Utilized a DNA-linked protease inhibitor for enzyme activity modulation.
• Designed and synthesized two generations of regulated SK-plasminogen (Pg) constructs.
• Assessed fibrinolytic activity in response to specific DNA inputs.

Main Results:

• Successfully achieved "OFF" and "ON" regulation of SK's fibrinolytic activity.
• Demonstrated dose-dependent and sequence-specific temporal control.
• Validated the efficacy of the DNA-linked protease inhibitor modification.
• Confirmed the feasibility of the enzyme-programming approach.

Conclusions:

• A novel enzyme-programming strategy using DNA-linked modifications has been established.
• This approach offers precise temporal control over enzyme activity.
• The findings represent a significant step towards developing next-generation programmable enzyme therapeutics.