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Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...

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Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays
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Linker Engineering in Stapled Peptides for Enhanced Membrane Permeability: Screening and Optimization Strategies.

Min Zhao1, Baojian Li1,2, Ying Gao1,2

  • 1School of Pharmacy, Xinjiang Second Medical College, Karamay 834000, China.

International Journal of Molecular Sciences
|April 14, 2026
PubMed
Summary

Linker engineering enhances stapled peptide drug permeability by optimizing lipophilicity and conformation. This review covers high-throughput screening and structural refinement strategies for developing cell-permeable peptide therapeutics.

Keywords:
chameleonicityhigh-throughput screening (HTS)intracellular deliveryintramolecular hydrogen bond (IMHB)linker engineeringmembrane permeabilityrational designstapled peptides

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Area of Science:

  • Medicinal Chemistry
  • Drug Development
  • Biotechnology

Background:

  • Late-stage failures in peptide drug development are often linked to poor membrane permeability.
  • Stapled peptides offer therapeutic potential but require optimization for cell entry.
  • Linker engineering is a key strategy to modulate peptide physicochemical properties.

Purpose of the Study:

  • To systematically review linker-based strategies for improving stapled peptide permeability.
  • To categorize methods for early discovery (high-throughput screening) and later refinement.
  • To analyze advancements in permeability assessment methodologies.

Main Methods:

  • Integration of functionalized linkers into mRNA display, phage display, and DNA-encoded libraries (DELs) for high-throughput screening (HTS).
  • Rational design strategies for post-screening structural refinement, including intramolecular hydrogen-bond (IMHB) shielding and stimuli-responsive reversible stapling.
  • Shift from qualitative imaging to quantitative cytosolic delivery assays for mechanism analysis.

Main Results:

  • Linker diversity enables precise modulation of lipophilicity and conformational constraints, overcoming desolvation energy penalties.
  • HTS methods identify lead scaffolds with inherent permeability potential.
  • Refinement strategies and advanced assays deepen understanding of permeability mechanisms like charge/lipophilicity balance and metabolism-driven trapping.

Conclusions:

  • Linker engineering is a robust technical roadmap for enhancing stapled peptide permeability.
  • These strategies facilitate the development of next-generation cell-permeable peptide therapeutics.
  • Optimized permeability is crucial for mitigating late-stage failures in peptide drug development.