Protease-Driven Phase Separation of Elastin-Like Polypeptides

Area of Science:

• Biomaterials Engineering
• Polymer Science
• Synthetic Biology

Background:

• Elastin-like polypeptides (ELPs) are stimuli-responsive polymers with tunable phase transition temperatures.
• Controlling ELP phase behavior with biological stimuli is crucial for advanced biomaterial applications.
• Existing ELP systems primarily rely on temperature-induced phase separation.

Purpose of the Study:

• To engineer elastin-like polypeptides (ELPs) that undergo isothermal phase separation triggered by proteases.
• To demonstrate protease-driven phase separation as a novel method for regulating ELP behavior in biological systems.
• To explore the generalizability of protease-cleavable ELP systems.

Main Methods:

• Design and synthesis of "cleavable" ELPs comprising hydrophobic and hydrophilic blocks linked by protease cleavage sites.
• Characterization of ELP solubility and phase behavior within a specific temperature window.
• Validation of protease-driven phase separation across multiple compatible ELP pairings.

Main Results:

• Developed protease-responsive ELPs that exhibit isothermal phase separation upon enzymatic cleavage.
• Established a temperature window where cleavable ELPs are soluble, but cleavage products are insoluble.
• Demonstrated the generalizability of this system with four distinct protease-cleavable ELP combinations.
• Showcased protease-driven phase separation as a viable mechanism for isothermal control.

Conclusions:

• Protease-driven phase separation offers a new paradigm for stimuli-responsive biomaterials based on ELPs.
• This approach enables precise, isothermal regulation of ELP behavior using biological triggers.
• The developed system holds significant potential for applications in drug delivery, tissue engineering, and diagnostics.