Two-dimensional liquid chromatography system for online top-down mass spectrometry
Zhixin Tian1, Rui Zhao, Nikola Tolić
1Pacific Northwest National Laboratory, Richland, WA, USA.
Proteomics
|September 30, 2010
Summary
A new online 2-D LC-MS/MS method enhances the analysis of histone post-translational modifications (PTMs). This sensitive technique requires minimal sample, improving efficiency for PTM mapping in core histones.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Proteomics
Background:
- Core histones are crucial for DNA packaging and gene regulation.
- Post-translational modifications (PTMs) on histones significantly impact cellular processes.
- Characterizing histone PTMs is essential for understanding epigenetic regulation.
Purpose of the Study:
- To develop and validate a sensitive, high-throughput online 2-D LC-MS/MS system for analyzing intact core histones.
- To investigate the PTMs of core histones, particularly histone H4, using the developed system.
- To demonstrate the system's capability for comprehensive characterization of histone variants.
Main Methods:
- Development of an online metal-free weak cation exchange-hydrophilic interaction liquid chromatography (LC/RPLC) system.
- Application of the system for top-down mass spectrometry (MS/MS) analysis.
- Analysis of core histones (H4, H2B, H2A, H3) purified from human fibroblasts.
Main Results:
- Identification of 41 histone H4 isoforms from a small sample amount (∼24 μg on-column).
- Unambiguous mapping of PTM type and location for 20 histone H4 variants.
- Significant improvements in sensitivity and reduction in sample requirements compared to offline methods.
- Reduced overall analysis time for core histone characterization.
Conclusions:
- The online weak cation exchange-hydrophilic interaction LC/RPLC platform provides a highly sensitive and efficient method for top-down MS analysis of core histones.
- This approach enables detailed characterization of histone PTMs at the intact protein level.
- The study represents a significant advancement in the high-throughput analysis of complex histone mixtures.
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