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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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  11. Intersection-free Fractal-like Structuring Of Recombinant Adhesive Proteins For Surface Functionalization.
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  5. Engineering
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  9. Wearable Materials
  11. Intersection-free Fractal-like Structuring Of Recombinant Adhesive Proteins For Surface Functionalization.

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Intersection-Free Fractal-Like Structuring of Recombinant Adhesive Proteins for Surface Functionalization.

Suhyeon Kim1,2,3, Deok Hyang Sa1,2, Woojung Jung1,2

  • 1SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea.

Nano Letters
|August 11, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Recombinant adhesive proteins (RAPs) exhibit fractal-like growth for efficient biomaterial surface functionalization. Optimal concentration (20-40 μg/mL) maximizes antimicrobial effects while minimizing protein use.

Keywords:
antimicrobialfractal structureprotein engineeringrecombinant protein

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Protein Engineering

Background:

  • Biomaterial performance relies on advanced surface functionalization.
  • Recombinant adhesive proteins (RAPs), derived from mussel proteins and antimicrobial peptides, offer novel functionalization capabilities.

Purpose of the Study:

  • To investigate the self-structuring properties of RAPs for biomaterial surface functionalization.
  • To determine the optimal concentration range for RAPs to achieve maximal antimicrobial efficacy and efficient surface coverage.

Main Methods:

  • Characterization of fractal-like structural growth of RAPs on diverse biomaterials.
  • Analysis of concentration-dependent growth patterns and antimicrobial activity.
  • Proposal of a mechanistic framework for RAP self-assembly and structuring.
surface functionalization

Main Results:

  • RAPs demonstrate a unique fractal-like growth property, enabling efficient and uniform surface coverage.
  • A critical saturation concentration range (20-40 μg/mL) was identified for maximal antimicrobial efficacy.
  • A mechanistic model was proposed, linking RAP domain interactions to self-assembly and intersection-free structures.

Conclusions:

  • Fractal-like growth of RAPs offers a novel strategy for durable and efficient biomaterial surface functionalization.
  • Tailored biomedical functionalization and antimicrobial materials can be achieved with controlled RAP properties.
  • This approach optimizes resource efficiency in protein-mediated surface structuring.