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Enzyme-Activatable Cell-Penetrating Peptides through a Minimal Side Chain Modification.

Saskia A Bode1, Morten B Hansen1, Roy A J F Oerlemans1

  • 1Radboud University Nijmegen, Institute for Molecules and Materials, Bio-organic Chemistry, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.

Bioconjugate Chemistry
|April 28, 2015
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Summary

Enzyme-cleavable domains were added to Tat peptides, creating inactive versions that become active cell-penetrating peptides. This targeted drug delivery strategy enhances selectivity by activating peptides only where specific enzymes are present.

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Area of Science:

  • Biochemistry
  • Drug Delivery
  • Molecular Biology

Background:

  • Cell-penetrating peptides (CPPs) are crucial for drug delivery.
  • Enhancing CPP selectivity is key to targeted therapies.
  • Enzyme-triggered activation offers a precise targeting strategy.

Purpose of the Study:

  • To develop activatable cell-penetrating peptides for enhanced drug delivery.
  • To utilize enzymatic reactions for controlled peptide activation and cellular uptake.
  • To engineer Tat peptides with enzyme-cleavable domains for targeted activation.

Main Methods:

  • Modification of the lysine side chain of Tat peptides.
  • Incorporation of a minimal-sized enzyme-cleavable domain.
  • Synthesis of blocked, inactive Tat-peptide conjugates.
  • Activation of peptides via coincubation with specific enzymes.

Main Results:

  • Successfully created blocked Tat-peptides that are initially inactive.
  • Demonstrated that these peptides can be activated by specific enzymes.
  • The activation process leads to the formation of cell-penetrating peptides.
  • The enzyme-dependent activation ensures localized activity.

Conclusions:

  • Enzyme-cleavable domains enable the development of activatable cell-penetrating peptides.
  • This approach provides a robust strategy for targeted drug delivery.
  • The localized activation enhances selectivity and minimizes off-target effects.