Related Experiment Video
Updated: Aug 20, 2025
10:37
Deep Proteome Profiling by Isobaric Labeling, Extensive Liquid Chromatography, Mass Spectrometry, and Software-assisted Quantification
Published on: November 15, 2017
12.0K
Quantitative assessment confirms deep proteome analysis by integrative top-down proteomics.
Katrina Carbonara1, Matthew P Padula2, Jens R Coorssen3,4
1Department of Health Sciences, Faculty of Applied Health Sciences, Brock University, St. Catharines, Ontario, Canada.
Electrophoresis
|November 23, 2022
Summary
Integrative top-down proteomics using two-dimensional gel electrophoresis (2DE) and mass spectrometry (MS) can deeply analyze proteomes. New methods confirm minimal proteoform loss, validating 2DE/LC/MS/MS for comprehensive proteome resolution.
Area of Science:
- Proteomics
- Analytical Chemistry
- Biochemistry
Background:
- Integrative top-down proteomics aims for comprehensive proteome analysis.
- Two-dimensional gel electrophoresis (2DE) coupled with liquid chromatography and tandem mass spectrometry (LC/MS/MS) is a key technique.
- Concerns exist regarding proteoform losses during the initial stages of 2DE.
Purpose of the Study:
- To investigate potential proteoform losses during the rehydration and isoelectric focusing (IEF) steps of 2DE.
- To compare an alternate faceup rehydration method with the standard facedown method.
- To quantitatively assess the impact of rehydration methods on proteome resolution.
Main Methods:
- Utilized a high-resolution, quantitative 2DE protocol.
- Employed an alternate faceup rehydration method for immobilized pH gradient strips.
- Compared proteoform losses between faceup and facedown rehydration methods during IEF.
Main Results:
- No detectable proteoform losses were observed with the faceup rehydration method.
- The standard facedown rehydration method resulted in less than 0.25% total proteoform loss.
- This minimal loss was found to be insignificant for overall proteome resolution.
Conclusions:
- The faceup rehydration method for 2DE effectively prevents proteoform loss.
- Standard 2DE rehydration causes negligible proteoform loss, not impacting proteome resolution.
- Quantitative front-end 2DE/LC/MS/MS is validated as the sole method for broad and deep proteome analysis via proteoform resolution.
