Cell Penetrating Peptides
Cell Penetrating Peptides - Related Videos
02:58
Fluorescence Leakage Assay to Study Cell-Penetrating Peptide Interaction with Membrane
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2025
This video discusses the fluorescence leakage assay to study the interactions of cell-penetrating peptides with cell membranes using cell membrane mimics — large unilamellar vesicles, or LUVs, encapsulated with a fluorescent dye and a quencher.
06:15
Biotinylated Cell-Penetrating Peptide Probe to Detect Protein-Protein Interactions
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2025
This video demonstrates a technique that uses biotinylated cell-penetrating peptides to detect intracellular protein-protein interactions. The cell-penetrating peptides facilitate the conjugated peptide to enter a cell and specifically bind to its interacting proteins. The biotin, after binding to avidin, allows purification of the interacting proteins’ complex from a cell lysate.
10:12
Construction of Cyclic Cell-Penetrating Peptides for Enhanced Penetration of Biological Barriers
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Cited by 5 •
2022
This protocol describes the synthesis of cyclic cell-penetrating peptides with aromatic cross-links and the evaluation of their permeability across biological barriers.
10:26
Biotinylated Cell-penetrating Peptides to Study Intracellular Protein-protein Interactions
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Cited by 3 •
2017
This is a protocol to study intracellular protein-protein interactions based on the biotin-avidin pull-down system with the novelty of combining cell-penetrating sequences. The main advantage is that the target sequence is incubated with living cells instead of cell lysates and therefore the interactions will occur within the cellular context.
07:33
Fluorescent Leakage Assay to Investigate Membrane Destabilization by Cell-Penetrating Peptide
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Cited by 4 •
2020
The fluorescence leakage assay is a simple method that enables the investigation of peptide/membrane interactions in order to understand their involvement in several biological processes and especially the ability of cell-penetrating peptides to disturb phospholipids bilayers during a direct cellular translocation process.
FAQs
Positively charged residues promote electrostatic attraction to negatively charged components of the cell membrane. This initial association can concentrate the peptide near the membrane and support either direct passage through the lipid barrier or uptake through endocytosis. The balance between these routes influences how much cargo enters cells and where it may be transported afterward.
Delivery efficiency depends on the peptide sequence, the nature of the attached cargo, and cellular conditions. These variables can alter membrane interactions, the likelihood of direct translocation or endocytosis, and subsequent intracellular trafficking. Consequently, a peptide that performs well with one cargo or cell condition may not produce the same outcome in another experimental setting.
Direct membrane translocation carries the peptide and its cargo across the membrane without the overview identifying an intermediate vesicular route, whereas endocytosis brings material into the cell through membrane-associated uptake. These pathways represent distinct entry mechanisms, and distinguishing them matters because intracellular trafficking can affect whether delivered molecules reach the location needed for biological activity.
Entry alone does not determine whether a delivered cargo will be useful. After uptake, intracellular trafficking influences the cargo's movement through the cell and its access to relevant processes or compartments. Studying this stage helps researchers understand delivery outcomes, interpret differences between peptide systems, and improve strategies intended to regulate gene expression or investigate intracellular biology.
The described cargo range includes proteins, nucleic acids, nanoparticles, and imaging agents. This breadth allows the same general delivery concept to support different experimental goals, from introducing functional biomolecules to visualizing cellular processes. Cargo choice remains important because its properties can influence uptake efficiency, intracellular handling, and the usefulness of the resulting biological readout.
CPP-based delivery can introduce nucleic acids or proteins into cells to examine intracellular mechanisms and regulate gene expression. Imaging agents can provide complementary information about cellular events, while nanoparticles extend the range of systems that can be investigated. These applications make the approach useful both for basic biology experiments and for developing delivery-oriented biomedical strategies.