Self-Assembly or Coassembly of Multiresponsive Histidine-Containing Elastin-Like Polypeptide Block Copolymers

Area of Science:

• Polymer Science
• Materials Science
• Nanotechnology

Background:

• Elastin-like polypeptides (ELPs) are stimuli-responsive biopolymers.
• Developing tunable nanocarrier systems is crucial for advanced applications.

Purpose of the Study:

• To describe a novel histidine-containing ELP diblock copolymer.
• To investigate its multiresponsive self-assembly behavior for nanocarrier development.

Main Methods:

• Examined self-assembly triggered by divalent metal ions (Zn2+).
• Investigated coassembly with a non-responsive ELP diblock copolymer.
• Assessed nanoparticle stability across temperature and pH variations.

Main Results:

• Zn2+ ions effectively stabilized ELP nanoparticles over a broad temperature range (4-45°C).
• The ELP diblock copolymer demonstrated pH-responsiveness, with particle disassembly under acidic conditions.
• Coassembly via thermal triggering yielded stable nanoparticles without requiring metal ions.

Conclusions:

• The developed ELP system provides a versatile, modular nanocarrier platform.
• The system's responsiveness to multiple stimuli (metal ions, pH, temperature) allows for effective tuning.
• This offers a promising approach for designing advanced drug delivery and diagnostic systems.