TMTpro™ Zero Label Reagent, 5 x 0.5 mg - FAQs

The TMTpro Zero Label Reagent was designed to be used to optimize methods before multiplexed analysis of samples.

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No, the TMT and TMTpro reagents cannot be mixed because the reporter ions are in the same region.

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Yes, unused TMTpro label reagent that has been dissolved in anhydrous acetonitrile can be aliquoted into tubes, dried under vacuum at 25-30 degrees C, purged with nitrogen, and stored in a sealed bag with desiccant at -20 degrees C.

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TMT labeling can be performed after reduction, alkylation, digestion, or prior to cleanup, if the sample is buffered at appropriate pH (8-8.5) in a suitable buffer without primary amines (e.g., Tris, glycine). TMT labeling can also be performed after peptide clean-up. Labeling of peptides after clean-up enables measuring and normalizing of the peptide samples for equal mixing.

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Applying correction factors is required for more accurate relative protein quantitation as the isotopic impurity is variable among the tags, ranging from 5-10%.

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This is most often done with the utilization of a "pool channel" for each multiplex set. This reference channel typically contains an equimolar mixture of all samples which is labeled with one of the TMT tags that is shared among the sets. The pool channel can be used to then normalize relative protein abundance measurements across multiplexed sets.

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The EasyPep kit chemistry is fully compatible with TMT/TMTpro reagents. Most commonly, TMT/TMTpro reagents are used to label peptides immediately after digestion and before peptide cleanup. This enables combining samples for a single cleanup step which reduces variability for more reproducible quantitative measurements. Another option is to label samples after peptide cleanup. This approach provides efficient labeling of the samples but may require the use of a peptide quantification assay to ensure that samples are equally mixed before LC-MS analysis. Both the workflows should provide high labelling efficiencies using our recommended TMT/TMTpro reagent to sample ratios.

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We recommend using high-resolution Orbitrap Tribrid (e.g., Fusion, Lumos, Eclipse), Orbitrap Exploris (e.g., 240, 480), or Q Exactive (e.g,. Plus, HF, HFX) series of instruments.

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Tandem Mass Tag technology is used to individually label different protein samples so they can be combined into a single sample for LC-MS analysis. The major advantages of this workflow are higher sample throughput, less instrument analysis time, high precision of peptide quantitation among replicates, and fewer missing quantified proteins among different samples.

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The EasyPep Mini MS Sample Prep kit is compatible with TMT labeling, peptide fractionation, and phosphopeptide enrichment.

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TMT quantitation is relative between samples unless a heavy peptide standard is included for comparison.

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TMT technology is used to perform multiplex quantitation of proteins extracted from cells and tissues. Rather than quantify single proteins (for example with an antibody), here, large numbers of proteins can be quantified in a single run.

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The Pierce TMT11plex Yeast Digest Standard is a lyophilized yeast peptide mixture of four congenic strains labeled with TMT11plex reagents. It serves as a standard for quality assessment of LC and MS data for samples labeled with Tandem Mass Tag (TMT) reagents.

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Quadrupole isolation is faster because ions must travel through the quadrupole analyzer regardless of the analysis type chosen. As a result, there is little to no time penalty when using the quadrupole for MS² isolation. In such a case, quadrupole transmission efficiency will depend on isolation width, m/z, and the cleanliness of the analyzer. Ion trap isolation is best suited for MS³ experiments, including those performed using multinotch isolation for TMT analysis; these types of isolation events are not possible with the quadrupole analyzer.

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With Pierce Peptide Desalting Spin Columns, more than 90% of salt or labeling tags such as TMT tags can be removed.

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With Pierce Peptide Desalting Spin Columns, the reproducibility coefficient of variation (CV) is ± 20%.

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