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Engineered Escherichia coli produce self-assembling amyloid materials. These bacterial amyloids can be externally controlled or patterned autonomously, and interface with nanoparticles for novel composite materials.

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Area of Science:

  • Biomaterials Science
  • Synthetic Biology
  • Microbiology

Background:

  • Natural systems assemble complex, responsive multiscale materials.
  • Biological systems offer platforms for advanced material synthesis.

Purpose of the Study:

  • To engineer Escherichia coli for producing self-assembling amyloid-based materials.
  • To explore the interface of bacterial amyloids with inorganic nanomaterials.
  • To develop controllable and patterned functional composite materials.

Main Methods:

  • Utilized inducible genetic and cellular communication circuits to regulate curli amyloid production in E. coli.
  • Interfaced engineered curli fibrils with gold nanoparticles (AuNPs) and quantum dots (QDs).
  • Investigated self-assembly across multiple length scales and material patterning.

Main Results:

  • Demonstrated E. coli's ability to produce externally controllable or autonomously patterned amyloid materials.
  • Created biofilm-based electrical switches responsive to environmental stimuli.
  • Synthesized gold nanowires/nanorods and modulated QD fluorescence via co-localization with AuNPs.
  • Nucleated the formation of fluorescent zinc sulfide (ZnS) quantum dots.

Conclusions:

  • Engineered bacterial cells can produce functional, multiscale amyloid-based composite materials.
  • This approach enables the synthesis, patterning, and environmental control of advanced materials.
  • Provides a foundation for cell-based synthesis of functional nanomaterials.