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Tunable Conformation-Dependent Engineered Protein·Gold Nanoparticle Nanocomposites.

Jasmin Hume1, Raymond Chen1, Rudy Jacquet2

  • 1†Department of Chemical and Biomolecular Engineering, New York University Polytechnic School of Engineering, Brooklyn, New York 11201, United States.

Biomacromolecules
|April 14, 2015
PubMed
Summary
This summary is machine-generated.

Protein secondary structure dictates the assembly of protein-gold nanoparticle (AuNP) nanocomposites. This research shows tunable bionanocomposite kinetic barriers for electrode applications.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Protein Engineering

Background:

  • Protein structure is crucial for nanomaterial assembly.
  • Gold nanoparticles (AuNPs) are versatile building blocks for nanocomposites.
  • Controlling protein-gold nanoparticle interactions is key for advanced materials.

Purpose of the Study:

  • To demonstrate in situ fabrication of protein-AuNP nanocomposites.
  • To investigate the influence of protein secondary structure on AuNP assembly.
  • To explore the potential of these hybrid materials as tunable bionanocomposite kinetic barriers.

Main Methods:

  • Fabrication of protein-gold nanoparticle (AuNP) nanocomposites in situ.
  • Utilizing pentameric coiled-coil proteins (C and Q) with varying histidine tags and helicities.
  • Employing external triggers like TFE to manipulate protein structure and conformation.

Main Results:

  • Protein secondary structure determined distinct nanocomposite assemblies.
  • Pentameric coiled-coil proteins with histidine tags and higher helicities (54-65%) led to precipitated composites with 6.5 nm AuNPs.
  • Proteins without histidine tags and lower helicities (37-45%) formed stable, soluble composites with 4.5 nm AuNPs.
  • External triggers allowed control over macromolecular conformation and properties.

Conclusions:

  • Protein secondary structure is a critical determinant in protein-AuNP nanocomposite formation and properties.
  • Tunable protein-AuNP assemblies can be fabricated by controlling protein structure.
  • These hybrid assemblies show promise for applications as tunable bionanocomposite kinetic barriers on electrodes.