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Title: Thermosensitivity of growth is determined by chaperone-mediated proteome reallocation

Abstract

Maintenance of a properly folded proteome is critical for bacterial survival at notably different growth temperatures. Understanding the molecular basis of thermoadaptation has progressed in two main directions, the sequence and structural basis of protein thermostability and the mechanistic principles of protein quality control assisted by chaperones. Yet we do not fully understand how structural integrity of the entire proteome is maintained under stress and how it affects cellular fitness. To address this challenge, we reconstruct a genome-scale protein-folding network for Escherichia coli and formulate a computational model, FoldME, that provides statistical descriptions of multiscale cellular response consistent with many datasets. FoldME simulations show (i) that the chaperones act as a system when they respond to unfolding stress rather than achieving efficient folding of any single component of the proteome, (ii) how the proteome is globally balanced between chaperones for folding and the complex machinery synthesizing the proteins in response to perturbation, (iii) how this balancing determines growth rate dependence on temperature and is achieved through nonspecific regulation, and (iv) how thermal instability of the individual protein affects the overall functional state of the proteome. Overall, these results expand our view of cellular regulation, from targeted specific control mechanisms tomore » global regulation through a web of nonspecific competing interactions that modulate the optimal reallocation of cellular resources. As a result, the methodology developed in this study enables genome-scale integration of environment-dependent protein properties and a proteome-wide study of cellular stress responses.« less

Authors:
 [1];  [2];  [3];  [1];  [1];  [4]
  1. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Bioengineering
  2. Univ. of California, San Diego, La Jolla, CA (United States). Div. of Biological Sciences
  3. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Bioengineering and Bioinformatics and Systems Biology
  4. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Bioengineering and Dept. of Pediatrics; Technical Univ. of Denmark, Lyngby (Denmark). Novo Nordisk Foundation Center for Biosustainability
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1498117
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 43; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; thermoadaptation; proteome allocation; bacterial growth law; genome-scale model; molecular chaperones

Citation Formats

Chen, Ke, Gao, Ye, Mih, Nathan, O’Brien, Edward J., Yang, Laurence, and Palsson, Bernhard O. Thermosensitivity of growth is determined by chaperone-mediated proteome reallocation. United States: N. p., 2017. Web. doi:10.1073/pnas.1705524114.
Chen, Ke, Gao, Ye, Mih, Nathan, O’Brien, Edward J., Yang, Laurence, & Palsson, Bernhard O. Thermosensitivity of growth is determined by chaperone-mediated proteome reallocation. United States. https://doi.org/10.1073/pnas.1705524114
Chen, Ke, Gao, Ye, Mih, Nathan, O’Brien, Edward J., Yang, Laurence, and Palsson, Bernhard O. Tue . "Thermosensitivity of growth is determined by chaperone-mediated proteome reallocation". United States. https://doi.org/10.1073/pnas.1705524114. https://www.osti.gov/servlets/purl/1498117.
@article{osti_1498117,
title = {Thermosensitivity of growth is determined by chaperone-mediated proteome reallocation},
author = {Chen, Ke and Gao, Ye and Mih, Nathan and O’Brien, Edward J. and Yang, Laurence and Palsson, Bernhard O.},
abstractNote = {Maintenance of a properly folded proteome is critical for bacterial survival at notably different growth temperatures. Understanding the molecular basis of thermoadaptation has progressed in two main directions, the sequence and structural basis of protein thermostability and the mechanistic principles of protein quality control assisted by chaperones. Yet we do not fully understand how structural integrity of the entire proteome is maintained under stress and how it affects cellular fitness. To address this challenge, we reconstruct a genome-scale protein-folding network for Escherichia coli and formulate a computational model, FoldME, that provides statistical descriptions of multiscale cellular response consistent with many datasets. FoldME simulations show (i) that the chaperones act as a system when they respond to unfolding stress rather than achieving efficient folding of any single component of the proteome, (ii) how the proteome is globally balanced between chaperones for folding and the complex machinery synthesizing the proteins in response to perturbation, (iii) how this balancing determines growth rate dependence on temperature and is achieved through nonspecific regulation, and (iv) how thermal instability of the individual protein affects the overall functional state of the proteome. Overall, these results expand our view of cellular regulation, from targeted specific control mechanisms to global regulation through a web of nonspecific competing interactions that modulate the optimal reallocation of cellular resources. As a result, the methodology developed in this study enables genome-scale integration of environment-dependent protein properties and a proteome-wide study of cellular stress responses.},
doi = {10.1073/pnas.1705524114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 43,
volume = 114,
place = {United States},
year = {Tue Oct 10 00:00:00 EDT 2017},
month = {Tue Oct 10 00:00:00 EDT 2017}
}

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Cited by: 45 works
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Figures / Tables:

Figure 1 Figure 1: FoldME reconstruction and validation. (A) Elementary model reactions for the three folding pathways. The flux going through each reaction is denoted Vreaction_label, and the coupling constraints are explained in the text. (B) Illustration of how temperature dependence of each biophysical property is combined to compute their collective effectmore » on cell growth. CR stands for chaperone requirement calculated from agg alone; CR(T) takes into account both agg and ∆G(T). (C) FoldME predictions (circles connected with a solid line) of relative growth rates of E. coli over temperatures, compared with data obtained from the literature (16, 50, 51) (diamonds) and in-house experiments (triangles).« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.