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Related Experiment Videos

Thiol-based regulatory switches.

Mark S B Paget1, Mark J Buttner

  • 1Department of Biochemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QG, United Kingdom. m.paget@sussex.ac.uk

Annual Review of Genetics
|November 18, 2003
PubMed
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Cellular thiol-based switches regulate responses to oxidative stress. Different modifications to the same protein can lead to multiple activation states and distinct regulatory outcomes.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • Thiol-based regulatory switches are crucial for cellular responses to oxidative and nitrosative stress.
  • Protein sulfhydryls exhibit flexibility in modifications and signal perception.
  • Cysteine oxidation products beyond disulfide bonds are relevant for in vivo redox sensing.

Purpose of the Study:

  • To review thiol-based switches in microbial proteins.
  • To highlight unique regulatory features of these switches.
  • To discuss how different modifications create multiple activation states.

Main Methods:

  • Literature review of seven well-characterized microbial proteins.
  • Analysis of cysteine oxidation products and their regulatory roles.

Related Experiment Videos

  • Comparison of distinct modifications on the same protein under different stresses.

    • Main Results:

    • Disulfide bonds are not the sole relevant cysteine oxidation products for redox sensing.
    • Distinct stress conditions can induce different modifications on the same protein (e.g., OxyR, Yap1).
    • The same cysteine residue can undergo distinct modifications, leading to varied regulatory outcomes.

    Conclusions:

    • Thiol-based switches provide sophisticated redox sensing mechanisms.
    • Protein modifications offer a flexible platform for cellular regulation.
    • Understanding these switches is key to deciphering cellular stress responses.