NanoTPOT: Enhanced Sample Preparation for Quantitative Nanoproteomic Analysis

Area of Science:

• Proteomics
• Biochemistry
• Cellular Biology

Background:

• Accurate proteome analysis is crucial for pathological research, yet limited clinical samples pose challenges.
• High-throughput, sensitive, and reproducible sample processing is essential for advanced proteomic studies.

Purpose of the Study:

• To develop and optimize a single-tube nanoproteomic workflow for processing limited biological samples.
• To improve protein quantification and minimize sample loss in mass spectrometry-based proteomics.

Main Methods:

• Developed the Nanogram TMT Processing in One Tube (NanoTPOT) workflow using an acid-cleavable detergent.
• Optimized proteolytic digestion, tandem mass tag (TMT) labeling, and fractionation strategies.
• Eliminated the need for sample desalting, enabling direct mass spectrometry compatibility.

Main Results:

• The NanoTPOT workflow successfully processed minimal protein amounts (1 µg lysate or ~0.5 µg from 2000 cells).
• Identified and quantified 6935 proteins from 1 µg HeLa cell lysate and 5474 proteins from 2000 sorted HeLa cells per TMT 10-plex channel.
• Demonstrated effective analysis of cellular stress responses.

Conclusions:

• The NanoTPOT workflow offers an efficient alternative for nanoproteomic sample processing.
• This method minimizes sample loss, crucial for rare biological and clinical samples.
• Enables sensitive and quantitative protein analysis in demanding research settings.