Stapling the Tat Cell-Penetrating Peptide into a Helix Dramatically Improves Cell Entry and Cargo Delivery
Hydrocarbon-stapled Tat peptides with enforced helical structure showed greater cell uptake, better endosomal escape, higher protease resistance, and low toxicity compared to unstapled Tat.
Quick Facts
What This Study Found
Hydrocarbon-stapled Tat peptides showed correlated improvements in helicity, hydrophobicity, heparan sulfate binding, cellular uptake, endosomal escape, and proteolytic stability with low cytotoxicity.
Key Numbers
Hydrophobicity/helicity correlated with uptake; higher heparan sulfate affinity; increased endosomal escape; high proteolytic stability; low cytotoxicity
How They Did This
Systematic peptide design with hydrocarbon staples at various positions; cellular uptake quantification; heparan sulfate binding assays; endosomal escape analysis; protease stability testing; cytotoxicity assessment.
Why This Research Matters
Cell-penetrating peptides are limited by poor stability and endosomal trapping. Stapling addresses both problems simultaneously, making CPPs more practical for drug delivery.
The Bigger Picture
The stapled peptide field is growing rapidly. Applying stapling to cell-penetrating peptides — not just therapeutic peptides — creates better delivery tools for the entire biologics field.
What This Study Doesn't Tell Us
In vitro only; cargo delivery efficiency not quantified for specific therapeutics; manufacturing cost of stapled peptides is higher; in vivo performance unknown.
Questions This Raises
- ?Do stapled Tat peptides maintain their advantages in vivo?
- ?What is the optimal staple position for different cargo types?
- ?Can stapled CPPs deliver large cargoes like antibodies or nanoparticles?
Trust & Context
- Key Stat:
- Triple improvement Stapled Tat showed simultaneous gains in cell uptake, endosomal escape, and protease stability
- Evidence Grade:
- Moderate — systematic structure-activity study with multiple correlated measurements, but in vitro only.
- Study Age:
- Published in 2020; stapled CPP technology continues to be refined.
- Original Title:
- Hydrocarbon staple constructing highly efficient α-helix cell-penetrating peptides for intracellular cargo delivery.
- Published In:
- Chemical communications (Cambridge, England), 56(100), 15655-15658 (2020)
- Authors:
- Li, Shu, Zhang, Xingjiao, Guo, Chen(4), Peng, Yali, Liu, Xiaojing, Wang, Bo, Zhuang, Ran, Chang, Min, Wang, Rui
- Database ID:
- RPEP-04949
Evidence Hierarchy
Frequently Asked Questions
What is peptide stapling?
A chemical modification that cross-links amino acid side chains to lock a peptide into a stable helical shape, making it more resistant to breakdown and more effective at penetrating cells.
What is the Tat peptide?
A short peptide derived from HIV that naturally penetrates cell membranes. It's widely used as a delivery vehicle to carry drugs and research tools into cells.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-04949APA
Li, Shu; Zhang, Xingjiao; Guo, Chen; Peng, Yali; Liu, Xiaojing; Wang, Bo; Zhuang, Ran; Chang, Min; Wang, Rui. (2020). Hydrocarbon staple constructing highly efficient α-helix cell-penetrating peptides for intracellular cargo delivery.. Chemical communications (Cambridge, England), 56(100), 15655-15658. https://doi.org/10.1039/d0cc06312f
MLA
Li, Shu, et al. "Hydrocarbon staple constructing highly efficient α-helix cell-penetrating peptides for intracellular cargo delivery.." Chemical communications (Cambridge, 2020. https://doi.org/10.1039/d0cc06312f
RethinkPeptides
RethinkPeptides Research Database. "Hydrocarbon staple constructing highly efficient α-helix cel..." RPEP-04949. Retrieved from https://rethinkpeptides.com/research/li-2020-hydrocarbon-staple-constructing-highly
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.