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Related Concept Videos

Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Related Experiment Video

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Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry
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Self-assembly of S-layer-enveloped cytochrome c polyelectrolyte multilayers.

Roman Dronov1, Dirk G Kurth, Helmuth Möhwald

  • 1Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Golm/Potsdam, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 23, 2008
PubMed
Summary

Researchers developed a novel method using self-assembly to create electroactive polyelectrolyte multilayers with cytochrome c (cyt c) and bacterial S-layer proteins. This technique enables the creation of biocompatible, selective films for potential sensor applications.

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In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers
08:10

In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers

Published on: July 28, 2018

Area of Science:

  • Biomaterials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Layer-by-layer self-assembly is a versatile technique for fabricating functional thin films.
  • Incorporating redox proteins like cytochrome c (cyt c) into multilayers can impart electrochemical activity.
  • Bacterial S-layer proteins offer a unique platform for creating ordered biomolecular structures.

Purpose of the Study:

  • To investigate the electrostatic layer-by-layer self-assembly of electroactive polyelectrolyte multilayers incorporating cyt c.
  • To combine this assembly with recrystallization of Bacillus sphaericus S-layer proteins.
  • To explore the potential for creating biocompatible and permselective outer envelopes for sensor applications.

Main Methods:

  • Fabrication of polyelectrolyte multilayers on gold electrodes using alternating layers of sulfonated polyaniline and cyt c.
  • Monitoring film formation using atomic force microscopy (AFM) in liquid.
  • Characterization of cyt c electroactivity via cyclic voltammetry.
  • Recrystallization of S-layer proteins onto the multilayer film.

Main Results:

  • Successful layer-by-layer self-assembly of polyelectrolyte multilayers with cyt c.
  • Demonstrated electroactivity of cyt c within the multilayer assembly.
  • Observed changes in surface properties after each adsorption step.
  • Feasible recrystallization of S-layer proteins on top of the multilayer film, with partial retention of cyt c electroactivity.

Conclusions:

  • The study presents a novel strategy for designing biocompatible and permselective outer envelopes for polyelectrolyte multilayers.
  • The integration of cyt c and bacterial S-layer proteins offers promising avenues for advanced sensor development.
  • This approach combines electrochemical functionality with biomimetic structural properties.