Peptide Mapping
Peptide Mapping - Related Videos
08:04
Overlapping Peptide Library to Map Qa-1 Epitopes in a Protein
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Cited by 4 •
2017
Qa-1 (HLA-E in human) belongs to a group of non-classical major histocompatibility complex 1b molecules. Immunization with Qa-1-binding epitopes has been shown to augment tissue-specific immune regulation and ameliorate several autoimmune diseases. Herein we describe an overlapping peptide library strategy for the identification of Qa-1 epitopes in a protein.
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.
05:43
A STAGE Tip Procedure for Desalting and Purification of Peptides
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2026
Source:Tia Rizakos1, Jennifer Geddes-McAlister11Molecular and Cellular Biology Department, University of Guelph.This video demonstrates peptide purification through the STAGE Tip procedure. A miniature column containing resin beads bonded to long hydrocarbon chains facilitates hydrophobic interaction-based purification. Upon loading a pre-digested peptide sample into the column, the peptide fragments bind to the resin beads, allowing impurities to pass through. An elution buffer that disrupts...
06:58
Fate Mapping
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2023
Fate mapping is a technique used to understand how embryonic cells divide, differentiate, and migrate during development. In classic fate mapping experiments, cells in different areas of an embryo are labeled with a chemical dye and then tracked to determine which tissues or structures they form. Technological improvements now allow for individual cells to be marked and traced throughout embryonic development and adulthood. This video reviews the concepts behind fate mapping, and then details a...
11:03
Motor Maps
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California One principle of brain organization is the topographic mapping of information. Especially in sensory and motor cortices, adjacent regions of the brain tend to represent information from adjacent parts of the body, resulting in maps of the body expressed on the surface of the brain. The primary sensory and motor maps in the brain surround a prominent sulcus known as the central sulcus. The cortex...
FAQs
Selective enzymatic digestion converts the protein into a peptide mixture whose composition can be examined through its fragments. Using an enzyme such as trypsin makes the fragmentation step deliberate rather than random. This provides defined material for liquid chromatographic separation and subsequent mass spectrometric sequence assignment, supporting a structured analysis of the original protein.
Mass-to-charge ratios provide measurements for the peptides produced during digestion, while tandem spectra supply additional information used to assign their sequences. Considering these measurements together links observed analytical signals to specific protein fragments. The combined evidence helps researchers evaluate whether the measured peptide pattern agrees with the expected molecular identity.
Peptide mapping can examine disulfide bonds and post-translational modifications in addition to confirming sequence-related identity. These features may distinguish an expected protein structure from a structurally altered form. The method therefore supports a broader chemical assessment, helping researchers investigate whether a protein retains the characteristics anticipated during development or manufacturing.
Researchers compare the peptide fragments detected from a manufactured protein with the fragments predicted from its expected structure. Agreement supports molecular identity and consistency, whereas differences can indicate structural changes or other product-related concerns. This comparison is especially useful when monitoring whether production materials remain aligned with the intended protein design.
In biopharmaceutical research, peptide mapping provides evidence for sequence verification, structural characterization, impurity assessment, and consistency monitoring. Its results can be used during development to examine manufactured proteins and during quality control to compare product characteristics with expectations. These applications make the method relevant to both research decisions and ongoing evaluation of production consistency.
Inconsistency may be suggested by peptide results that do not match the expected molecular structure, including evidence related to sequence, disulfide bonds, post-translational modifications, or impurities. Because peptide mapping examines several of these characteristics within one analytical framework, it can help distinguish simple identity confirmation from a broader assessment of product quality and structural conformity.