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Amyloid Fibrils03:03

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Rapid Generation of Amyloid from Native Proteins In vitro
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Fold modulating function: bacterial toxins to functional amyloids.

Adnan K Syed1, Blaise R Boles2

  • 1Department of Molecular Cellular and Developmental Biology, University of Michigan Ann Arbor, MI, USA.

Frontiers in Microbiology
|August 20, 2014
PubMed
Summary
This summary is machine-generated.

Bacteria can control toxic protein function by altering their structure. Amyloid folds render toxins inert, acting as storage or biofilm components, demonstrating environmental adaptation through protein folding.

Keywords:
aggregationbacterial toxinbifunctional proteinbiofilmfunctional amyloid

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Bacteria produce cytolytic toxins to interact with host cells or competing microbes.
  • Environmental factors are known to regulate bacterial toxin expression.
  • Recent research indicates that bacteria can manipulate protein folding of toxins to control their activity.

Purpose of the Study:

  • To explore the role of protein folding, specifically the amyloid fold, in bacterial toxin function.
  • To review how environmental conditions influence toxin structure and activity.
  • To discuss the implications of amyloid formation in bacterial survival and community behavior.

Main Methods:

  • Review of existing literature on bacterial toxins and amyloid formation.
  • Analysis of studies investigating the structural changes of toxins in response to environmental cues.
  • Examination of research on the functional consequences of toxin amyloid formation.

Main Results:

  • Bacterial toxins can adopt a stable amyloid fold under specific environmental conditions.
  • In the amyloid state, toxins lose their cytolytic activity, becoming inert.
  • Amyloid toxins can serve as storage systems or structural components of biofilms, enhancing resistance.

Conclusions:

  • Bacterial toxin function is elegantly controlled by changes in protein fold and solubility.
  • Protein folding serves as a mechanism for bacteria to adapt toxin activity to environmental conditions.
  • Amyloid formation represents a key strategy for bacterial survival, resource management, and community defense.