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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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ECM Protein Nanofibers and Nanostructures Engineered Using Surface-initiated Assembly
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Dynamically resolved self-assembly of S-layer proteins on solid surfaces.

Bart Stel1, Fernando Cometto, Behzad Rad

  • 1Max Planck-EPFL Laboratory for Molecular Nanoscience, École Polytechnique Fédérale de Lausanne, Switzerland. magali.lingenfelder@epfl.ch.

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High-speed Atomic Force Microscopy revealed the step-by-step process of S-layer protein self-assembly. This provides a new model for understanding 2D protein self-assembly dynamics at interfaces.

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Area of Science:

  • Biophysics
  • Materials Science
  • Surface Science

Background:

  • Self-assembly is crucial for biological structures and nanomaterials.
  • Understanding the kinetics of protein self-assembly is essential for controlling material properties.

Purpose of the Study:

  • To resolve the kinetic pathway of S-layer self-assembly at the solid-liquid interface.
  • To develop a comprehensive model for 2D protein self-assembly dynamics.

Main Methods:

  • Utilized high-speed and high-resolution Atomic Force Microscopy (AFM).
  • Monitored self-assembly across various time scales (seconds to hours) and spatial scales (nm to microns).

Main Results:

  • Successfully resolved the complete kinetic pathway of S-layer self-assembly in a single experiment.
  • Observed distinct stages including nucleation, growth, and structural rearrangements.

Conclusions:

  • The study provides a detailed temporal and spatial model for 2D protein self-assembly.
  • AFM is a powerful tool for elucidating dynamic processes at the solid-liquid interface.