Tat Peptide
Tat Peptide - Related Videos
10:30
Delivery of Proteins, Peptides or Cell-impermeable Small Molecules into Live Cells by Incubation with the Endosomolytic Reagent dfTAT
0 Views •
Cited by 10 •
2015
We describe how to deliver proteins and cell-impermeable small molecules into cultured mammalian cells by a simple co-incubation protocol with a reagent that causes endocytic organelles to become leaky.
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.
04:00
Immunoaffinity Based Extraction of Ubiquitinylated Peptides: A Technique to Selectively Extract Ubiquitin Tagged Peptides from Purified Peptide Fractions
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2023
This video describes a method to extract and purify ubiquitinylated peptides containing remnant di-glycine peptides from a complex peptide mixture. The presented method may help in identifying original ubiquitination sites in the protein.
03:21
Peptide Purification: An RP-HPLC-based Technique to Extract Peptides from Digested Protein Lysates
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2023
In this video, we demonstrate reversed-phase high-performance liquid chromatography to purify peptides from a digested protein lysate mixture. These purified peptides are then lyophilized and stored for downstream applications. Analysis of peptides can help understand the mechanics involved in cellular signaling and cancer.
12:27
Measuring Peptide Translocation into Large Unilamellar Vesicles
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Cited by 9 •
2012
This protocol details a method for the quantitative measure of peptide translocation into large unilamellar lipid vesicles. This method also provides information about the rate of membrane translocation and can be used to identify peptides that efficiently and spontaneously cross lipid bilayers.
FAQs
Arginine-rich residues give the peptide a strong positive charge, allowing it to interact with negatively charged components on the cell surface. These interactions promote association with cells and support uptake of the peptide and its attached cargo. This electrostatic mechanism is important because many biological cargos cannot efficiently cross cellular membranes on their own.
After entry, Tat peptide cargo can follow uptake pathways that include endocytosis, in which the cell encloses external material in membrane-bound compartments. Delivery therefore depends not only on internalization but also on subsequent intracellular release. Endosomal entrapment can limit access to the cytoplasm, making release an important consideration when interpreting delivery efficiency.
Tat peptide can transport diverse cargo classes, including proteins, nucleic acids, nanoparticles, and other molecules. Their different biological roles make the approach adaptable, but successful delivery requires the cargo to remain associated with the peptide during uptake and become available inside the cell. This expands access to materials that would otherwise be membrane-impermeable.
Researchers should distinguish cellular uptake from effective intracellular availability. A signal showing that peptide or cargo entered cells does not necessarily demonstrate release from endosomal compartments. Experiments therefore need to consider both uptake efficiency and endosomal entrapment when assessing whether the delivered material can reach the intracellular location required for its intended biological activity.
A basic experiment pairs Tat peptide with a selected cargo, exposes living cells to that delivery system, and examines whether the material becomes available inside the cells. The cargo may be a protein, nucleic acid, nanoparticle, or other molecule. Interpreting the result requires attention to uptake and possible retention in endosomal compartments.
Biologists use this strategy when they need to study materials that have limited access across cell membranes. Applications described for the method include investigating gene regulation, cellular signaling, and other intracellular processes. By transporting proteins, nucleic acids, nanoparticles, or related cargo into living cells, it supports experiments linking delivered material to cellular behavior.