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Bioinspired Genetic and Chemical Engineering of Protein Hydrogels for Programable Multi-Responsive Actuation.

Ting Ji1, Haoyuan Shi2, Xinyi Yang1

  • 1The Zhejiang University - University of Edinburgh Institute, Zhejiang University School of Medicine, Zhejiang University, Hangzhou, 310058, China.

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|June 9, 2024
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Summary

Researchers developed new protein hydrogels for soft robotics by combining genetic and chemical engineering. These intelligent actuators exhibit programmable complex deformations in response to stimuli like temperature and pH.

Keywords:
diazonium coupling chemistryprogramable actuationsilk‐elastin‐like proteinsstimuli‐responsive hydrogelstunable mechanics

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Area of Science:

  • Biomaterials Engineering
  • Soft Robotics
  • Protein Engineering

Background:

  • Protein hydrogels are crucial for biomedical soft robotics due to their tunable properties.
  • Integrating multiple stimuli-responsive features into biocompatible actuators remains a significant challenge.

Purpose of the Study:

  • To develop a facile approach for creating protein hydrogel actuators with programmable complex spatial deformation.
  • To synergistically combine genetic and chemical engineering for advanced hydrogel actuator design.

Main Methods:

  • Genetically engineered silk-elastin-like proteins (SELPs) were designed with stimuli-responsive motifs and enzymatic crosslinking sites using simulation-guided strategies.
  • Chemical modifications, specifically diazonium coupling chemistry, were employed to functionalize SELPs and create patterned hydrogels.
  • The resulting SELP hydrogels were tested for their responsive actuation under various external stimuli.

Main Results:

  • The engineered SELP hydrogels demonstrated programmable complex actuations, including controllable bending, buckling, and intricate deformations.
  • The hydrogels responded predictably to external stimuli such as temperature, ionic strength, and pH.
  • The combined genetic and chemical engineering approach allowed for tailored material properties and anisotropy.

Conclusions:

  • This work presents a predictable, tunable, and sustainable method for fabricating intelligent soft actuators using protein hydrogels.
  • The developed approach has significant implications for advancing biomedical materials and biorobotics.
  • The synergistic combination of genetic and chemical engineering offers a powerful platform for designing sophisticated biomimetic actuators.