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Amyloid Fibrils03:03

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Rapid Generation of Amyloid from Native Proteins In vitro
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Mining and engineering activity in catalytic amyloids.

Samuel Peña-Díaz1, Pedro Ferreira2, Maria João Ramos2

  • 1Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark.

Methods in Enzymology
|May 30, 2024
PubMed
Summary

This study details methods for testing amyloid catalytic properties, focusing on functional amyloid proteins like CsgA and FapC for biotechnological applications. Researchers can explore novel catalytic functions and nanotechnological designs using these stable amyloid structures.

Keywords:
Amyloid formationCatalytic assaysChromogenic substratesComputational analysisFunctional and pathological amyloidQM/MM

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Area of Science:

  • Biotechnology and Nanotechnology
  • Biochemistry and Structural Biology

Background:

  • Amyloid proteins exhibit remarkable structural and kinetic properties.
  • Functional amyloids, such as CsgA and FapC, possess high physical stability.
  • These properties make them attractive for nanotechnological designs, including catalytic applications.

Purpose of the Study:

  • To describe methods for testing catalytic properties of different amyloid preparations.
  • To introduce functional amyloid proteins (CsgA and FapC) and their characteristics.
  • To provide a computational protocol for grafting enzyme active sites onto amyloid structures.

Main Methods:

  • Expression, purification, preparation, and testing of tau, α-synuclein, CsgA, and FapC amyloid proteins.
  • Introduction to the structural and kinetic properties of functional amyloids.
  • Computational protocol for site-specific grafting of enzyme active sites onto CsgA.

Main Results:

  • Established methods for evaluating catalytic properties of various amyloid types.
  • Demonstrated the potential of functional amyloids for nanotechnological and catalytic purposes.
  • Provided a computational framework for engineering novel amyloid-based catalysts.

Conclusions:

  • Bacterial functional amyloids offer significant opportunities in biotechnology.
  • The described methods and protocols can inspire further research in amyloid-based catalysis and design.
  • Engineered amyloid structures hold promise for diverse applications, from structural to medical and catalytic.