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Protein Quantitation

Accurate relative protein quantitation is one of the cornerstones of quantitative proteomics. It is essential to the proper understanding of biological assemblies or for biomarker panels discovery experiments.

Quantify more proteins

Developed to meet the demands of sample limitations and throughput

Accurate relative protein quantitation is one of the cornerstones of quantitative proteomics. It is essential to the proper understanding of biological assemblies or for biomarker panels discovery experiments. The unique combination of speed, selectivity, sensitivity and robustness delivered by Bruker’s proteomics solutions allow users to obtain reliable quantitative information for more proteins while working from limited amount and/or short gradient times.

PASEF-LFQ and 4D-Match Between Runs (MBR): get the best from two worlds

Typical challenges in non-targeted protein quantitation are the cycle time (defining the chromatographic peak resolution), the uniqueness of the ion(s) chosen to determine a peptide amount (selectivity) and the system sensitivity (quantitation of low-abundance compounds). MS-based approaches provide comprehensive quantitative results but  overlapping ions reduce the selectivity of these workflows. MS/MS (DIA) based quantitation provides excellent selectivity at the cost of reduced sensitivity.

TIMS-PASEF based label-free quantitation (PASEF-LFQ) combines the best of both approaches. TIMS provides both an additional dimension of separation, greatly increasing selectivity, while the preconcentration effect of the TIMS cell provides greater sensitivity. The PASEF cycle time is compatible with narrow nano-UHPLC peaks while its speed (>100 Hz MS/MS) greatly improves the reproducibility of parent ion selection compared to traditional DDA approaches.
In this case, the timsTOF Pro’s unique 4D-MBR approach allows to overcome the missing value problem with an unprecedented sensitivity.   

Label-free quantification outcome of a three-proteome mixture. The total load is 150 ng, separated with a 60 min gradient. PeaksX is used for processing, Perseus for display.

Enter the 4th dimension

In some cases, highly complex samples or short gradient analysis, the 100 Hz MS/MS repletion rate is not sufficient to reproducibly select the same ions over a large set of analyses.

In this case reproducible Collisional Cross Section determination (mobility) enables 4D-Match Between Runs (MBR) which maximizes the number of proteins quantified from Label Free Quantification experiments while maintaining the highest level of confidence for high throughput sample analysis. The 4D-MBR approach is supported by the latest PEAKS and MaxQuant versions. Read our corresponding LC-MS154 application note.  

Stepping into the future: introducing dia-PASEF
For data independent acquisition (DIA), dia-PASEF leverages the correlation between molecular mass and mobility to target the densest peptide region. The extra dimension results in increased selectivity, increased sensitivity and shorter cycle times. For more information on how dia-PASEF pushes the limits of 4D-Proteomics, read our LC-MS157 application note.

diaPASEF quant outcome (Processing with Biognosys’s Spectronaut™) Protein level quantitation results for a label free experiment on a 3-proteome digest. More than 8500 proteins covering 5 orders of magnitude in concentration could be identified and quantified.

Advanced proteomics processing software

MaxQuant data processing
MaxQuant, the popular, powerful, open-source software fully supports PASEF-LFQ data enabling advanced quantitation, visualization and reporting.

Advanced software support
An increasing number of advanced proteomics processing software packages now directly read the timsTOF PRO raw data: this includes Skyline, Gene Data, the complete  Protein Metrics suite, Mascot Distiller

PEAKS data processing
PEAKS Studio is powered by high performance feature extraction from tims data files, obtaining high quality results in peptide-based protein identification, label-free quantitation and DeNovo sequencing. Multiple sophisticated visualization and exporting capacities allow users  to review, share or refine results from multiple proteomics analyses.

Get ready for high-throughput clinical research

The unique ability of the timsTOF Pro to deliver sustainable performance over thousands of injections combined with the enhanced LFQ performance make the system an ideal platform for high-throughput clinical research.

Data processing is key for protein quantitation and the PASEF-LFQ approach is already supported by some of the most powerful software suites.

Evosep One/timsTOF Pro for clinical proteomics: reproducibility and performance level of 100 consecutive injections of 50 ng of an Hela cell digest separated with a 6 min gradient (200 samples/day method. Left: intensities correlation for the 100 runs. Middle: Illustration of LFQ outcome. Right: reproducible measurement of species with various concentration levels.