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Related Experiment Video

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Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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Conformationally restricted calpain inhibitors.

S E Adams1, E J Robinson2, D J Miller1

  • 1School of Chemistry , Cardiff University , Main Building, Park Place , Cardiff , UK CF10 3AT . Email: allemannrk@cardiff.ac.uk ; ; Tel: +44 (0) 29 2087 9014.

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Selective calpain-I inhibitors are crucial for disease research. New α-mercaptoacrylic acid derivatives show enhanced potency by targeting the calcium-binding domain, offering improved therapeutic potential.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Calpain-I, a cysteine protease, is implicated in various diseases, making it a key therapeutic target.
  • Developing selective calpain-I inhibitors is challenging due to cross-reactivity with other proteases and calpain isoforms.
  • Selective inhibitors are vital tools for elucidating calpain-I's physiological and pathological roles.

Purpose of the Study:

  • To investigate the inhibitory mechanism of α-mercaptoacrylic acid derivatives against calpain-I and calpain-II.
  • To explore the structural basis for selectivity and potency by targeting the PEF(S) domain.
  • To evaluate the impact of oxidation state on inhibitor efficacy.

Main Methods:

  • X-ray diffraction analysis of co-crystals of PEF(S) domain with α-mercaptoacrylic acid derivatives.
  • Measurement of inhibitory potency (IC50 values) of various inhibitor forms.
  • Comparison of binding interactions between reduced and disulfide forms of inhibitors.

Main Results:

  • The disulfide form of α-mercaptoacrylic acid demonstrated enhanced binding within a hydrophobic groove of the PEF(S) domain compared to the reduced sulfhydryl form.
  • Oxidation of inhibitors led to significantly decreased IC50 values, indicating increased potency.
  • Disulfide bonds' stereo-electronic properties restrict rotation, contributing to improved inhibitory efficacy.

Conclusions:

  • α-Mercaptoacrylic acid-based inhibitors targeting the PEF(S) domain offer a promising strategy for selective calpain-I inhibition.
  • The disulfide form of these inhibitors exhibits superior potency due to favorable interactions and restricted rotation.
  • These findings pave the way for developing novel therapeutics and research tools for calpain-I related diseases.