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The Proteasome02:18

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Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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A self-assembling peptide platform enables plasma membrane protein degradation.

Wenjie Zhou1, Yanyan Li2, Wenli Shi2

  • 1Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen 518000, China; Faculty of Pharmaceutical Sciences, Shenzhen University of Advanced Technology, Shenzhen 518028, China; Guangdong Key Laboratory of Nanomedicine, CAS-HK Joint Lab of Biomaterials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

Bioorganic & Medicinal Chemistry Letters
|December 10, 2025
PubMed
Summary

Researchers developed a new strategy called SAILTAC to degrade cell surface proteins. This method uses self-assembling peptides to target and remove proteins like PD-L1, offering a novel tool for nanomedicine.

Keywords:
PD-L1Plasma membrane proteinProtein degradationSelf-assembling peptide

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nanomedicine

Background:

  • Plasma membrane proteins are crucial for cell functions and disease processes.
  • Protein clustering triggers internalization and degradation, influencing protein turnover.
  • Targeting these proteins is key for drug development.

Purpose of the Study:

  • To develop a novel strategy for targeted degradation of plasma membrane proteins.
  • To create a modular system using self-assembling peptides for protein degradation.
  • To investigate the efficacy of this strategy against membrane proteins like PD-L1.

Main Methods:

  • Designed bifunctional chimera molecules (SAILTAC) linking a POI-binding ligand to self-assembling peptides (WIII/YIII).
  • Tested SAILTAC's ability to degrade membrane-anchored GFP and PD-L1 in cancer cell lines.
  • Optimized a dimeric chimera (YIII-BMS)₂ for potent PD-L1 reduction.

Main Results:

  • SAILTAC chimeras efficiently degraded membrane-anchored GFP and PD-L1.
  • The optimized dimeric chimera (YIII-BMS)₂ significantly reduced PD-L1 levels in various cancer cells.
  • Degradation occurred via the lysosomal pathway.

Conclusions:

  • SAILTAC is a versatile and targeted strategy for degrading plasma membrane proteins.
  • This approach provides a new tool for nanomedicine applications.
  • SAILTAC offers potential for therapeutic interventions by controlling protein levels.