Use of Time-Resolved Fluorescence To Improve Sensitivity and Dynamic Range of Gel-Based Proteomics

Area of Science:

• Proteomics
• Biotechnology
• Analytical Chemistry

Background:

• Two-dimensional gel electrophoresis (2-DE) has limitations in sensitivity and dynamic range.
• These limitations hinder global proteomics and biomarker discovery.
• Advanced imaging techniques are needed to overcome these challenges.

Purpose of the Study:

• To present proof-of-concept for time-resolved fluorescence in 2-DE image acquisition.
• To demonstrate improved sensitivity and accuracy in in-gel protein quantification.
• To enable detection of low-abundance proteins for biomarker discovery.

Main Methods:

• Utilized time-resolved fluorescence during image acquisition for background subtraction.
• Employed minimal difference gel electrophoresis workflow with enhanced detection.
• Introduced cumulative time-resolved emission two-dimensional electrophoresis (CuTEDGE) technology.

Main Results:

• Achieved 330-fold and 8000-fold improvements in lowest limit of quantification for Cy2 and Cy5 dyes, respectively.
• Enabled detection of proteins at sub-attomolar levels.
• Reduced laser power and excitation times, minimizing photobleaching.

Conclusions:

• CuTEDGE technology significantly enhances 2-DE sensitivity for proteomics.
• Facilitates in-depth analysis of scarce samples like primary human tissues.
• Improves the potential for discovering disease subphenotype biomarkers through high-sensitivity 2-DE.