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- W2316960810 abstract "Mass spectrometry (MS) is a powerful tool to accurately identify and quantify histone post-translational modifications (PTMs). High-resolution mass analyzers have been regarded as essential for these PTM analyses because the mass accuracy afforded is sufficient to differentiate trimethylation versus acetylation (42.0470 and 42.0106 Da, respectively), whereas lower-resolution mass analyzers cannot. Noting this limitation, we sought to determine whether lower-resolution detectors are nonetheless adequate for histone PTM analysis by comparing the low-resolution LTQ Velos Pro with the high-resolution LTQ-Orbitrap Velos Pro. We first determined that the optimal scan mode on the LTQ Velos Pro is the Enhanced scan mode with respect to apparent resolution, number of MS and MS/MS scans per run, and reproducibility of label-free quantifications. We next compared the performance of the LTQ Velos Pro to the LTQ-Orbitrap Velos Pro using the same criteria for comparison, and we found that the main difference is that the LTQ-Orbitrap Velos Pro is able to resolve the difference between acetylation and trimethylation while the LTQ Velos Pro cannot. However, using heavy isotope labeled synthetic peptide standards and retention time information enables confident assignment of these modifications and comparable quantification between the instruments. Therefore, lower-resolution instruments can confidently be utilized for histone PTM analysis." @default.
- W2316960810 created "2016-06-24" @default.
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- W2316960810 date "2014-10-30" @default.
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- W2316960810 title "High Resolution Is Not a Strict Requirement for Characterization and Quantification of Histone Post-Translational Modifications" @default.
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- W2316960810 doi "https://doi.org/10.1021/pr500902f" @default.
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