Related Experiment Video
Updated: Sep 30, 2025
Direct Protein Delivery to Mammalian Cells Using Cell-permeable Cys2-His2 Zinc-finger Domains
Published on: March 25, 2015
Amphipathic poly-β-peptides for intracellular protein delivery
Qianyi Ren1, Qi Chen2, Lanfang Ren1
1Shanghai Frontiers Science Center of Genome Editing and Cell Therapy, Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, 200241, P. R. China. yycheng@mail.ustc.edu.cn.
Researchers developed amphipathic poly-β-peptides for effective intracellular protein delivery. Higher molecular weight and hydrophobic content enhance protein loading and delivery efficiency, preserving bioactivity.
Area of Science:
- Biomaterials Science
- Drug Delivery Systems
- Protein Engineering
Background:
- Intracellular protein delivery is crucial for various therapeutic applications.
- Developing efficient and non-toxic delivery systems remains a significant challenge.
- Poly-β-peptides offer a promising platform due to their tunable properties.
Purpose of the Study:
- To design and synthesize novel amphipathic poly-β-peptides for enhanced intracellular protein delivery.
- To investigate the structure-activity relationship between poly-β-peptide characteristics and delivery efficiency.
- To evaluate the efficacy and bioactivity preservation of protein delivery using the lead poly-β-peptide candidate.
Main Methods:
- Synthesis of a series of amphipathic poly-β-peptides with varying molecular weights and hydrophobic contents.
- Characterization of poly-β-peptides, including molecular weight, hydrophobicity, and self-assembly properties.
- Assessment of protein loading capacity and encapsulation efficiency.
- In vitro evaluation of cellular uptake and protein delivery efficiency.
- Analysis of protein bioactivity post-delivery.
Main Results:
- Amphipathic poly-β-peptides were successfully synthesized.
- Higher molecular weight and increased hydrophobic content correlated with enhanced protein loading.
- Superior intracellular protein delivery efficiency was observed with optimized poly-β-peptides.
- The lead poly-β-peptide demonstrated efficient protein delivery while preserving the target protein's bioactivity.
Conclusions:
- Amphipathic poly-β-peptides represent a viable strategy for efficient intracellular protein delivery.
- Molecular weight and hydrophobicity are key parameters for optimizing poly-β-peptide-based delivery systems.
- The developed lead material shows potential for therapeutic applications requiring intracellular protein delivery with preserved function.
More Related Videos
10:26Biotinylated Cell-penetrating Peptides to Study Intracellular Protein-protein Interactions
Published on: December 20, 2017
10:30Delivery of Proteins, Peptides or Cell-impermeable Small Molecules into Live Cells by Incubation with the Endosomolytic Reagent dfTAT
Published on: September 2, 2015
Related Concept Videos
01:19Translocation of Proteins into the Mitochondria
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
01:27Post-translational Translocation of Proteins to the RER
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
01:45ER Retrieval Pathway
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
01:26Insertion of Single-pass Transmembrane Proteins in the RER
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...