Peptide Translocation Assay
Peptide Translocation Assay - Related Videos
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.
02:42
A Fluorogenic Peptide Cleavage Assay to Screen the Proteolytic Activity of Proteases
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2025
This video demonstrates an assay to screen for the proteolytic activity of proteases using fluorogenic peptides. The protease recognizes its cleavage site on the peptide, cleaving it and separating the quencher from the fluorophore, enabling its fluorescence emission. The fluorescence signal is detected and analyzed to check for the cleavage efficiency of different peptide variants.
07:59
A High Throughput MHC II Binding Assay for Quantitative Analysis of Peptide Epitopes
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Cited by 21 •
2014
Biochemical assays with recombinant human MHC II molecules can provide rapid, quantitative insights into immunogenic epitope identification, deletion, or design. Here, a peptide-MHC II binding assay scaled to 384-well plates is described. This cost effective format should prove useful in the fields of protein deimmunization and vaccine design and development.
06:01
The Gliding Actin Filament Assay: An In Vitro Motility Assay to Study Translocation of Actin Filaments on Immobilized Myosins
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2025
In this video, we perform an in vitro motility assay to analyze the actin-myosin interactions. The gliding movement of actin filaments on immobilized myosin molecules is visualized using fluorescence microscopy.
08:06
Automated Acoustic Dispensing for the Serial Dilution of Peptide Agonists in Potency Determination Assays
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Cited by 1 •
2016
Peptide adsorption to plasticware during traditional tip-based serial dilutions can significantly impact potency determination and confound the understanding of structure-activity relationships used for lead identification and lead optimization phases of drug discovery. Here methods for automated acoustic non-contact serial dilution of peptide samples are described.
FAQs
Sequence, charge, and structure can change how a peptide interacts with a membrane, making them central variables in assay design and interpretation. Comparing peptides that differ in these properties helps identify molecular features associated with more or less efficient passage. The resulting measurements connect peptide design with observed membrane permeability or cellular uptake.
Separating internalized peptide from surface-bound peptide is essential because both can contribute to the measured signal. A strong signal does not necessarily indicate membrane crossing unless the assay distinguishes material that remains attached externally from material associated with the cell interior. This distinction makes uptake estimates more meaningful and prevents surface binding from being interpreted as translocation.
Membrane composition and peptide concentration can influence the amount of transport detected. Testing these variables allows investigators to determine whether a peptide behaves differently in a cellular membrane versus an artificial membrane, or whether its apparent efficiency changes with exposure level. These comparisons help relate transport outcomes to both peptide properties and the surrounding membrane environment.
A typical workflow begins by labeling the peptide, exposing it to cells or an artificial membrane, and measuring the signal associated with peptide entry. The measurement must then be interpreted alongside the signal from surface-bound material, so internalized and externally associated peptide are not treated as the same outcome. This workflow yields a quantitative view of translocation.
Cells are useful when the research question centers on cellular uptake, whereas an artificial membrane focuses on membrane permeability. Selecting between these models depends on the intended biological question. Comparing results from both systems can help indicate whether observed transport reflects peptide passage across a membrane generally or uptake associated specifically with cells.
The assay can characterize cell-penetrating peptides, antimicrobial peptides, and peptide-based delivery systems. In biology, its results help relate peptide properties and membrane composition to transport behavior. These findings support drug delivery and membrane biology research by showing whether a candidate crosses a membrane and how efficiently that entry occurs.