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Related Experiment Videos

Why does ethanol induce cellular heat-shock response?

S Chaudhuri1, B Jana, T Basu

  • 1Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, West Bengal, India.

Cell Biology and Toxicology
|February 8, 2006
PubMed
Summary
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Ethanol prevents alkaline phosphatase (AP) export in Escherichia coli, causing unfolded AP to accumulate in the cytoplasm. This triggers the heat-shock response (HSR) in E. coli.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Escherichia coli is a model organism for studying protein translocation.
  • The heat-shock response (HSR) is a cellular defense mechanism against stress.
  • Alkaline phosphatase (AP) is a periplasmic enzyme in E. coli.

Purpose of the Study:

  • To investigate the effect of ethanol on AP translocation in E. coli.
  • To determine if ethanol-induced inhibition of AP export triggers the HSR.

Main Methods:

  • E. coli cultures were grown in the presence of 10% ethanol.
  • Alkaline phosphatase (AP) activity and protein levels were measured.
  • Heat-shock protein (HSP) synthesis was analyzed.

Main Results:

Related Experiment Videos

  • Ethanol inhibited the translocation of induced AP to the periplasm.
  • Nontransported AP accumulated in the cytoplasm as an unfolded, inactive precursor.
  • Ethanol induced the HSR, evidenced by increased HSP synthesis.

Conclusions:

  • Ethanol-induced blockade of AP translocation leads to cytoplasmic accumulation of unfolded protein.
  • Accumulated unfolded proteins act as signals, triggering the HSR in E. coli.
  • This suggests that misfolded proteins in the cytoplasm can induce cellular stress responses.