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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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Related Experiment Video

Updated: May 22, 2026

In Vitro Assay for Studying the Aggregation of Tau Protein and Drug Screening
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A metabolite extracted from Escherichia coli suppresses tau aggregation.

Mahalashmi Srinivasan1, Akhil Patel, Tark Patel

  • 1Department of Biochemistry, University of Alberta, Edmonton, AB, Canada.

The Biochemical Journal
|April 15, 2026
PubMed
Summary

Researchers discovered that E. coli lysate prevents tau aggregation, a hallmark of neurodegenerative tauopathies. A component, methylphosphonic acid (MePn), shows potential for mitigating protein misfolding diseases.

Keywords:
Escherichia coliamyloidprotein aggregationprotein purificationtau proteins

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Tau aggregation is a critical pathological hallmark of neurodegenerative diseases known as tauopathies.
  • Understanding cellular factors that inhibit tau aggregation is crucial for developing therapeutic strategies against protein misfolding diseases.

Purpose of the Study:

  • To identify cellular components that prevent human tau aggregation.
  • To explore the potential of these components in mitigating tauopathies.

Main Methods:

  • Investigated the effect of E. coli lysate on in vitro human tau aggregation.
  • Fractionated the lysate to isolate inhibitory components using mass spectrometry and NMR.
  • Assessed the inhibitory effect of methylphosphonic acid (MePn) on tau aggregation in vitro and in live E. coli.

Main Results:

  • E. coli lysate significantly inhibited human tau aggregation in vitro.
  • A low molecular weight fraction containing methylphosphonic acid (MePn) was identified as an inhibitor.
  • MePn reduced tau amyloid formation in vitro and blocked tau aggregation in E. coli.

Conclusions:

  • Cellular metabolites, such as MePn, can directly modulate tau amyloid formation.
  • Findings can optimize recombinant tau protein purification and offer insights into tauopathy mitigation.