Template mediated protein self-assembly as a valuable tool in regenerative therapy

Area of Science:

• Biomaterials Science
• Synthetic Biology
• Soft-Matter Physics

Background:

• Protein self-assembly is crucial for synthetic biology, soft-material science, and regenerative therapy.
• Challenges include anisotropic interactions, poor solubility, and protein stability, limiting macro-scale architecture formation.

Purpose of the Study:

• To introduce a versatile platform for self-immobilizing diverse proteins onto silicon surfaces.
• To investigate the self-assembly of proteins into macro-scale architectures using a diffusion-limited aggregation (DLA) method.
• To explore the potential of these protein-assembled structures as topographical cues for cellular responses.

Main Methods:

• Utilized a one-step diffusion-limited aggregation (DLA) method on silicon surfaces functionalized with pendant -NH2 groups.
• Experimentally tested diverse proteins: type I collagen, bovine serum albumin, and cytochrome C.
• Employed fractal analysis to characterize assembled structures and understand deposition pathways.

Main Results:

• Diverse proteins self-assembled into seaweed-like, branched dendritic architectures via DLA without electrolytes.
• Branching architecture differences were attributed to protein subunit dissimilarities and surface functional group distribution.
• Fractal analysis revealed consistent deposition routes despite varying protein functionalities.
• Immobilized proteins on nano-micro-structured surfaces guided rat bone marrow stem cell morphology without compromising protein function.

Conclusions:

• The DLA method provides a facile and effective platform for protein self-immobilization and macro-architecture formation.
• Protein-assembled surfaces act as functional topographical cues, guiding cell morphology and behavior.
• This approach offers a promising strategy for tissue-material interfaces and biomaterial design.