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Related Experiment Video

Updated: May 12, 2026

Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
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Peptide aptamers: tools to negatively or positively modulate HSPB1(27) function.

Benjamin Gibert1, Stéphanie Simon, Valeriya Dimitrova

  • 1Apoptosis Cancer and Development Laboratory, Lyon Cancer Research Center, Centre Léon Bérard, INSERM U1052-CNRS 5238, University of Lyon, 69008 Lyon, France.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|March 27, 2013
PubMed
Summary

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Human heat shock protein 27 (HSPB1) regulates cellular responses to stress. A novel aptamer, PA23, stimulates HSPB1

Area of Science:

  • Molecular Biology
  • Cellular Stress Response
  • Protein Interactions

Background:

  • Human heat shock protein 27 (HSPB1) acts as a molecular chaperone, regulating cellular adaptation and protection.
  • Dysregulated HSPB1 expression is implicated in diseases, including cancer, where it promotes tumor growth and drug resistance.
  • HSPB1's function is modulated through phosphorylation and oligomerization, enabling interactions with client proteins.

Purpose of the Study:

  • To investigate novel therapeutic strategies targeting HSPB1 activity.
  • To identify aptamers that modulate HSPB1's protective and pathological functions.
  • To explore the potential of aptamer PA23 in disrupting HSPB1-pathology interactions.

Main Methods:

  • Isolation and characterization of HSPB1-interacting peptide aptamers.

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  • Analysis of aptamer interactions with HSPB1 small oligomers.
  • Assessment of aptamer PA23's effect on HSPB1 activity and interaction with HSPB5 (αB-crystallin).

    • Main Results:

    • Peptide aptamers PA11 and PA50 were previously shown to decrease HSPB1's anti-apoptotic and tumorigenic activities.
    • A novel aptamer, PA23, was identified with the ability to stimulate HSPB1's protective functions.
    • PA23 was demonstrated to abolish the negative effects of the HSPB5 R120G mutant by disrupting its interaction with HSPB1.

    Conclusions:

    • Structure-based strategies targeting HSPB1 interactions offer potential for therapeutic drug discovery.
    • Aptamer PA23 modulates HSPB1 activity and may counteract detrimental HSPB1-HSPB5 interactions.
    • Targeting HSPB1's protein-binding capabilities presents a promising avenue for developing novel therapeutics for various diseases.