Deep Profiling of Microgram-Scale Proteome by Tandem Mass Tag Mass Spectrometry.

Deep Profiling of Microgram-Scale Proteome by Tandem Mass Tag Mass Spectrometry.
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DOI:
10.1021/acs.jproteome.0c00426
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发表时间:
2021-01-01
影响因子:
4.4
通讯作者:
Peng J
Peng J
中科院分区:
生物学2区
文献类型:
--
作者:
Liu D;Yang S;Kavdia K;Sifford JM;Wu Z;Xie B;Wang Z;Pagala VR;Wang H;Yu K;Dey KK;High AA;Serrano GE;Beach TG;Peng J

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Tandem mass tag (TMT)-based mass spectrometry (MS) enables deep proteomic profiling of more than 10,000 proteins in complex biological samples, but requires up to 100 micrograms protein in starting materials during a standard analysis. Here we present a streamlined protocol to quantify more than 9,000 proteins with 0.5 microgram protein per sample by 16-plex TMT coupled with two-dimensional liquid chromatography and tandem mass spectrometry (LC/LC-MS/MS). In this protocol, we optimized multiple conditions to reduce sample loss, including processing each sample in a single tube to minimize surface adsorption, increasing digestion enzymes to shorten proteolysis and function as carriers, eliminating a desalting step between digestion and TMT labeling, and developing miniaturized basic pH LC for prefractionation. By profiling 16 identical human brain tissue samples of Alzheimer’s disease (AD), vascular dementia (VaD) and non-dementia controls, we directly compared this new microgram-scale protocol to the standard-scale protocol, quantifying 9,116 and 10,869 proteins, respectively. Importantly, bioinformatics analysis indicated the microgram-scale protocol had adequate sensitivity and reproducibility to detect differentially expressed proteins in disease-related pathways. Thus, this newly developed protocol is of general application for deep proteomics analysis of biological and clinical samples at sub-microgram levels.
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