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Assessment of TMT Labeling Efficiency in Large-Scale Quantitative Proteomics: The Critical Effect of Sample pH
[Image: see text] Isobaric labeling via tandem mass tag (TMT) reagents enables sample multiplexing prior to LC–MS/MS, facilitating high-throughput large-scale quantitative proteomics. Consistent and efficient labeling reactions are essential to achieve robust quantification; therefore, embedded in o...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8154127/ https://www.ncbi.nlm.nih.gov/pubmed/34056417 http://dx.doi.org/10.1021/acsomega.1c00776 |
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author | Hutchinson-Bunch, Chelsea Sanford, James A. Hansen, Joshua R. Gritsenko, Marina A. Rodland, Karin D. Piehowski, Paul D. Qian, Wei-Jun Adkins, Joshua N. |
author_facet | Hutchinson-Bunch, Chelsea Sanford, James A. Hansen, Joshua R. Gritsenko, Marina A. Rodland, Karin D. Piehowski, Paul D. Qian, Wei-Jun Adkins, Joshua N. |
author_sort | Hutchinson-Bunch, Chelsea |
collection | PubMed |
description | [Image: see text] Isobaric labeling via tandem mass tag (TMT) reagents enables sample multiplexing prior to LC–MS/MS, facilitating high-throughput large-scale quantitative proteomics. Consistent and efficient labeling reactions are essential to achieve robust quantification; therefore, embedded in our clinical proteomic protocol is a quality control (QC) sample that contains a small aliquot from each sample within a TMT set, referred to as “Mixing QC.” This Mixing QC enables the detection of TMT labeling issues by LC–MS/MS before combining the full samples to allow for salvaging of poor TMT labeling reactions. While TMT labeling is a valuable tool, factors leading to poor reactions are not fully studied. We observed that relabeling does not necessarily rescue TMT reactions and that peptide samples sometimes remained acidic after resuspending in 50 mM HEPES buffer (pH 8.5), which coincided with low labeling efficiency (LE) and relatively low median reporter ion intensities (MRIIs). To obtain a more resilient TMT labeling procedure, we investigated LE, reporter ion missingness, the ratio of mean TMT set MRII to individual channel MRII, and the distribution of log 2 reporter ion ratios of Mixing QC samples. We discovered that sample pH is a critical factor in LE, and increasing the buffer concentration in poorly labeled samples before relabeling resulted in the successful rescue of TMT labeling reactions. Moreover, resuspending peptides in 500 mM HEPES buffer for TMT labeling resulted in consistently higher LE and lower missing data. By better controlling the sample pH for labeling and implementing multiple methods for assessing labeling quality before combining samples, we demonstrate that robust TMT labeling for large-scale quantitative studies is achievable. |
format | Online Article Text |
id | pubmed-8154127 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-81541272021-05-27 Assessment of TMT Labeling Efficiency in Large-Scale Quantitative Proteomics: The Critical Effect of Sample pH Hutchinson-Bunch, Chelsea Sanford, James A. Hansen, Joshua R. Gritsenko, Marina A. Rodland, Karin D. Piehowski, Paul D. Qian, Wei-Jun Adkins, Joshua N. ACS Omega [Image: see text] Isobaric labeling via tandem mass tag (TMT) reagents enables sample multiplexing prior to LC–MS/MS, facilitating high-throughput large-scale quantitative proteomics. Consistent and efficient labeling reactions are essential to achieve robust quantification; therefore, embedded in our clinical proteomic protocol is a quality control (QC) sample that contains a small aliquot from each sample within a TMT set, referred to as “Mixing QC.” This Mixing QC enables the detection of TMT labeling issues by LC–MS/MS before combining the full samples to allow for salvaging of poor TMT labeling reactions. While TMT labeling is a valuable tool, factors leading to poor reactions are not fully studied. We observed that relabeling does not necessarily rescue TMT reactions and that peptide samples sometimes remained acidic after resuspending in 50 mM HEPES buffer (pH 8.5), which coincided with low labeling efficiency (LE) and relatively low median reporter ion intensities (MRIIs). To obtain a more resilient TMT labeling procedure, we investigated LE, reporter ion missingness, the ratio of mean TMT set MRII to individual channel MRII, and the distribution of log 2 reporter ion ratios of Mixing QC samples. We discovered that sample pH is a critical factor in LE, and increasing the buffer concentration in poorly labeled samples before relabeling resulted in the successful rescue of TMT labeling reactions. Moreover, resuspending peptides in 500 mM HEPES buffer for TMT labeling resulted in consistently higher LE and lower missing data. By better controlling the sample pH for labeling and implementing multiple methods for assessing labeling quality before combining samples, we demonstrate that robust TMT labeling for large-scale quantitative studies is achievable. American Chemical Society 2021-05-06 /pmc/articles/PMC8154127/ /pubmed/34056417 http://dx.doi.org/10.1021/acsomega.1c00776 Text en © 2021 The Authors. Published by American Chemical Society Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Hutchinson-Bunch, Chelsea Sanford, James A. Hansen, Joshua R. Gritsenko, Marina A. Rodland, Karin D. Piehowski, Paul D. Qian, Wei-Jun Adkins, Joshua N. Assessment of TMT Labeling Efficiency in Large-Scale Quantitative Proteomics: The Critical Effect of Sample pH |
title | Assessment of TMT Labeling Efficiency in Large-Scale
Quantitative Proteomics: The Critical Effect of Sample pH |
title_full | Assessment of TMT Labeling Efficiency in Large-Scale
Quantitative Proteomics: The Critical Effect of Sample pH |
title_fullStr | Assessment of TMT Labeling Efficiency in Large-Scale
Quantitative Proteomics: The Critical Effect of Sample pH |
title_full_unstemmed | Assessment of TMT Labeling Efficiency in Large-Scale
Quantitative Proteomics: The Critical Effect of Sample pH |
title_short | Assessment of TMT Labeling Efficiency in Large-Scale
Quantitative Proteomics: The Critical Effect of Sample pH |
title_sort | assessment of tmt labeling efficiency in large-scale
quantitative proteomics: the critical effect of sample ph |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8154127/ https://www.ncbi.nlm.nih.gov/pubmed/34056417 http://dx.doi.org/10.1021/acsomega.1c00776 |
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