Related Experiment Video
Updated: May 15, 2026
11:00
Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
Glycopeptide identification using liquid-chromatography-compatible hot electron capture dissociation in a
Naomi Manri1, Hiroyuki Satake, Akihito Kaneko
1Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan.
Analytical Chemistry
|January 16, 2013
Summary
We created a new mass spectrometer for glycoproteomics, enabling flexible electron capture dissociation (ECD) and hot ECD (HECD) experiments. This method enhances the analysis of complex sialylated glycopeptides, improving sequence coverage for glycoproteomics research.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Glycoproteomics
Background:
- Electron capture dissociation (ECD) is a powerful technique for peptide fragmentation in mass spectrometry.
- Analyzing complex glycopeptides, especially sialylated ones, remains challenging due to their heterogeneity and fragmentation patterns.
- Optimizing ECD parameters is crucial for improving sequence coverage and identifying novel glycopeptide structures.
Purpose of the Study:
- To develop a liquid chromatography (LC)-compatible electron capture dissociation (ECD) mass spectrometer for enhanced glycoproteomics analysis.
- To investigate the efficacy of ECD and hot ECD (HECD) with varying electron energies for dissociating sialylated and desialylated glycopeptides.
- To analyze N-linked glycopeptides from human transferrin using the developed ECD mass spectrometer coupled with nano LC.
Main Methods:
- Development of a novel LC-compatible ECD mass spectrometer allowing flexible switching between ECD and HECD by adjusting electron energy.
- Optimization of electron energies (0.2 eV, 5.0 eV, 9.0 eV) for ECD and HECD experiments on glycopeptides.
- Coupling of a nano LC system to the ECD mass spectrometer for analyzing N-linked glycopeptides from Lys-C digests of human transferrin.
Main Results:
- Both ECD and HECD effectively dissociated desialylated glycopeptides.
- Higher electron energies (>4 eV) in ECD significantly improved sequence coverage for sialylated glycopeptides compared to lower energies (0.2 eV).
- HECD identified sialylated bi-, tri-, and tetra-antennary complex N-glycopeptides with high sequence coverage, including previously difficult-to-analyze tri- and tetra-antennary glycans. Preferential dissociation of glycan nonreducing termini was observed.
Conclusions:
- The developed LC-compatible ECD mass spectrometer offers a flexible platform for glycoproteomics.
- HECD with optimized electron energies is highly effective for analyzing complex sialylated glycopeptides, including those with tri- and tetra-antennary structures.
- This advancement facilitates deeper insights into glycopeptide structures and their biological roles.
Related Concept Videos
01:33Peptide Identification Using Tandem Mass Spectrometry
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...
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...
01:21Mass Spectrometry: Complex Analysis
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
01:19Mass Analyzers: Common Types
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
01:15High-Performance Liquid Chromatography: Types of Detectors
The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
01:30Capillary Electrophoresis: Applications
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...