Peptide Identification
Peptide Identification - Related Videos
14:28
Peptide-based Identification of Functional Motifs and their Binding Partners
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Cited by 2 •
2013
Techniques to dissect the mechanisms underlying the secretion of HIV-1 Nef in exosomes are described. Specific short peptides derived from Nef and protein transfection were exploited to determine the structure, function, and binding partners of Nef’s Secretion Modification Region. These procedures have general relevance in many mechanistic studies.
08:09
Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope
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Cited by 15 •
2017
Here, the authors present a simple and efficient protocol to define a linear antigenic epitope using a purified monoclonal antibody and peptide scanning through dot-blot hybridization. The identified epitope can then be used in therapeutic and diagnostic applications.
01:33
Peptide Identification Using Tandem Mass Spectrometry
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2023
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties. This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
07:32
Screening and Identification of Small Peptides Targeting Fibroblast Growth Factor Receptor2 using a Phage Display Peptide Library
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Cited by 3 •
2019
Herein, we present a detailed protocol for screening small peptides that bind to FGFR2 using a phage display peptide library. We further analyze the affinity of the selected peptides toward FGFR2 in vitro and its ability to suppress cell proliferation.
14:58
Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Cited by 11 •
2012
Affinity purification of tagged proteins in combination with mass spectrometry (APMS) is a powerful method for the systematic mapping of protein interaction networks and for investigating the mechanistic basis of biological processes. Here, we describe an optimized sequential peptide affinity (SPA) APMS procedure developed for the bacterium Escherichia coli that can be used to isolate and characterize stable multi-protein complexes to near homogeneity even starting from low copy numbers per...
FAQs
Tandem mass spectrometry first records peptide ions and then fragments them into product ions. Because those fragments carry sequence-informative patterns, their measured spectra can be compared with theoretical or reference spectra. Agreement between the observed and expected patterns supports assignment of an amino acid sequence and helps establish the peptide’s molecular identity in the sample.
Liquid chromatography separates peptides before they enter the mass spectrometer, while ionization makes them suitable for mass-spectrometric measurement. Keeping these stages in sequence allows the analysis to address both peptide separation and the generation of fragment information. This combined strategy is particularly useful when a biological sample contains multiple peptides relevant to neuronal signaling.
Spectral matching is important because peptide identification depends on more than detecting a signal. Product-ion patterns are evaluated against theoretical or reference spectra, connecting the measured fragments to a proposed sequence and molecular identity. The quality of that agreement affects how confidently researchers can relate a detected peptide to a neurochemical signal or peptide hormone.
Brain tissue, cerebrospinal fluid, and neuronal cultures are supported sample types for peptide identification in neuroscience. These sources let investigators examine peptide signals in different experimental settings, from intact neural tissue to cultured cells or fluid associated with the nervous system. The sample choice connects the analytical result to the biological context being studied.
Peptide identification can support investigations of synaptic communication, stress, pain, appetite, and disease-related signaling. By determining which neuropeptides or peptide hormones occur in a sample, researchers can connect molecular signals with broader neuronal processes. This makes the approach useful for studying how peptide-associated communication changes across different neuroscience questions.
Reliable peptide identification can guide functional experiments by showing which molecular signals warrant further investigation. It also supports biomarker research, in which identified peptides may be evaluated in relation to disease-related signaling. The analytical result therefore serves as a foundation for testing peptide function and exploring whether particular signals have research value as indicators of biological or disease states.