Timepoint Selection Strategy for In Vivo Proteome Dynamics from Heavy Water Metabolic Labeling and LC-MS.

Timepoint Selection Strategy for In Vivo Proteome Dynamics from Heavy Water Metabolic Labeling and LC-MS.
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DOI:
10.1021/acs.jproteome.0c00023
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发表时间:
2020-05-01
影响因子:
4.4
通讯作者:
Sadygov RG
Sadygov RG
中科院分区:
生物学2区
文献类型:
--
作者:
Sadygov VR;Zhang W;Sadygov RG

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Protein homeostasis, proteostasis, is essential for healthy cell functioning and is dysregulated in many diseases. Metabolic labeling with heavy water followed by liquid chromatography coupled online to mass spectrometry (LC-MS) is a powerful high-throughput technique to study proteome dynamics in vivo. Longer labeling duration and dense timepoint sampling (TPS) of tissues provide accurate proteome dynamics estimations. However, the experiments are expensive, and they require animal housing and care, as well as the labeling with stable isotopes. Often the animals are sacrificed at selected timepoints to collect tissues. Therefore, it is necessary to optimize TPS for a given number of sampling points and labeling duration and target a specific tissue of study. Currently, such techniques are missing in proteomics. Here, we report on a formula-based stochastic simulation strategy for TPS for in vivo studies with heavy water metabolic labeling and LC-MS. We model the rate constant (lognormal), measurement error (Laplace), peptide length (Gamma), relative abundance (RA) of the monoisotopic peak (beta regression), and the number of exchangeable hydrogens (Gamma regression). The parameters of the distributions are determined using corresponding empirical probability density functions from a large-scale dataset of murine heart proteome. The models are used in simulations of the rate constant to minimize the root-mean-squared error (RMSE). The RMSE for different TPSs shows structured patterns. They are analyzed to elucidate common features in the patterns.
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