Related Experiment Video
Updated: May 8, 2026
10:50
Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography
Published on: March 9, 2010
Optimization of separation and digestion conditions in immune complexome analysis
Miyako Baba1, Kaname Ohyama, Naoya Kishikawa
1Course of Pharmaceutical Sciences, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8521, Japan.
Analytical Biochemistry
|September 10, 2013
Summary
Optimizing immune complexome analysis involves using longer nano-LC gradient times and packed spray capillary columns for better peptide and protein identification. Microwave-assisted digestion offers a faster alternative to conventional methods.
Area of Science:
- Proteomics
- Immunology
- Analytical Chemistry
Background:
- Immune complexome analysis identifies antigens in circulating immune complexes (CICs).
- The method involves immune complex separation, tryptic digestion, and nano-liquid chromatography-tandem mass spectrometry (nano-LC-MS/MS).
- Improving identification capability and reducing analysis time are key objectives.
Purpose of the Study:
- To enhance immune complexome analysis by optimizing nano-LC parameters and digestion methods.
- To evaluate the impact of gradient elution time and column type on peptide and protein identification.
- To compare microwave-assisted digestion with conventional digestion for efficiency and accuracy.
Main Methods:
- Investigated effects of gradient elution programs (25-400 min) and nano-LC column types (C18, C8, packed spray capillary).
- Compared microwave-assisted digestion with overnight conventional incubation at 37 °C.
- Analyzed peptide and protein identification numbers using nano-LC-MS/MS.
Main Results:
- Longer gradient elution times (up to 400 min) increased peptide and protein identification.
- Packed spray capillary columns yielded higher identification numbers compared to C18 and C8 columns.
- Microwave-assisted digestion significantly reduced digestion time, with comparable or slightly lower miscleaved peptide percentages than conventional methods.
Conclusions:
- Extended gradient times and packed spray capillary columns improve immune complexome analysis sensitivity.
- Microwave-assisted digestion provides a rapid and effective alternative for sample preparation.
- These optimizations enhance the efficiency and scope of identifying antigens in circulating immune complexes.
Related Concept Videos
01:20Immunoprecipitation
Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
01:20Overview Of Cell Separation And Isolation
Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.