Opt-TMT: An optimized and scaled-down TMT labeling strategy for limited sample.

Area of Science:

• Proteomics
• Analytical Chemistry
• Biotechnology

Background:

• Mass spectrometry-based proteomics enables sensitive analysis but relies on costly isobaric labeling reagents like Tandem Mass Tag (TMT).
• Current TMT protocols are designed for large sample quantities, limiting their application in studies with scarce biological material and increasing research expenses.

Purpose of the Study:

• To develop an optimized isobaric labeling protocol (Opt-TMT) that significantly reduces reagent consumption and sample input requirements.
• To maintain high labeling efficiency (>99%) while decreasing costs by up to 90% compared to commercial TMT protocols.

Main Methods:

• Optimized reaction conditions, including reduced reaction volumes and increased peptide concentration, were employed to enhance labeling efficiency with low peptide quantities (6-15 μg/channel).
• The optimized protocol (Opt-TMT) was validated for labeling efficiency and cost-effectiveness.

Main Results:

• Achieved consistent labeling efficiency above 99% even with minimal peptide amounts (6-15 μg/channel).
• Reduced reagent costs by up to 90% compared to standard commercial TMT protocols.
• Demonstrated the protocol's suitability for limited sample quantities and its cost-effectiveness.

Conclusions:

• The Opt-TMT protocol offers a cost-effective and scalable solution for isobaric labeling in mass spectrometry-based proteomics.
• This method enables high-quality quantitative proteomics for studies with limited biological material, such as patient samples or PTM analyses.
• Opt-TMT broadens access to TMT workflows for resource-limited laboratories without compromising analytical quality.