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Evaluation of advanced precursor determination for tandem mass tag (TMT)-based quantitative proteomics across instrument platforms.

A new interesting article has been published in J Proteome Res. 2018 Oct 23. doi: 10.1021/acs.jproteome.8b00611. [Epub ahead of print] and titled:

Evaluation of advanced precursor determination for tandem mass tag (TMT)-based quantitative proteomics across instrument platforms.

Authors of this article are:

Myers SA, Klaeger S, Satpathy S, Viner R, Choi J, Rogers J, Clauser K, Udeshi ND, Carr SA.

A summary of the article is shown below:

TMT-based quantitation is a strong modality for quantitative proteomics as samples can be multiplexed, creating large-scale data sets with high precision and minimal missing values. However, co-isolation/co-fragmentation of near isobaric, co-eluting precursor peptide analytes has been well documented to show ratio compression, compromising the accuracy of peptide/protein quantitation. Advanced peak determination (APD) is a new peak picking algorithm that shows improved identification of peak detection in survey scans (MS1) to increase the number of precursors selected for unimolecular dissociation (MS2). To increase the number of these “features” selected for MS2 APD purposefully selects multiple peptide precursors of very similar m/z that often derive from different proteins – a major source of ratio compression in TMT quantification. Here, we evaluate the effects of various data acquisition parameters combined with APD on ratio compression. We find that data acquisition with APD enabled results in more co-isolated precursors, more mixed spectra, and in turn, fewer peptide spectral matches, especially at standard on-column loads. We conclude that APD should not be utilized for isobaric tagging, MS2-based experiments.

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