Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzyme
Protein mutational landscapes are shaped by the cellular environment, but key factors and their quantitative effects are often unknown. Here we show that Lon, a quality control protease naturally absent in common E. coli expression strains, drastically reshapes the mutational landscape of the metabo...
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doaj-cda4130dfdc640e48cf5aaef0e23ee132021-05-05T21:20:31ZengeLife Sciences Publications LtdeLife2050-084X2020-07-01910.7554/eLife.53476Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzymeSamuel Thompson0https://orcid.org/0000-0001-6468-9538Yang Zhang1Christine Ingle2https://orcid.org/0000-0002-0203-2845Kimberly A Reynolds3https://orcid.org/0000-0003-4805-0317Tanja Kortemme4https://orcid.org/0000-0002-8494-680XGraduate Group in Biophysics, University of California San Francisco, San Francisco, United StatesDepartment of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, United StatesThe Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, United StatesThe Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, United States; Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, United StatesGraduate Group in Biophysics, University of California San Francisco, San Francisco, United States; Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, United States; Chan Zuckerberg Biohub, San Francisco, United StatesProtein mutational landscapes are shaped by the cellular environment, but key factors and their quantitative effects are often unknown. Here we show that Lon, a quality control protease naturally absent in common E. coli expression strains, drastically reshapes the mutational landscape of the metabolic enzyme dihydrofolate reductase (DHFR). Selection under conditions that resolve highly active mutants reveals that 23.3% of all single point mutations in DHFR are advantageous in the absence of Lon, but advantageous mutations are largely suppressed when Lon is reintroduced. Protein stability measurements demonstrate extensive activity-stability tradeoffs for the advantageous mutants and provide a mechanistic explanation for Lon’s widespread impact. Our findings suggest possibilities for tuning mutational landscapes by modulating the cellular environment, with implications for protein design and combatting antibiotic resistance.https://elifesciences.org/articles/53476proteostasismutational landscapesactivity-stability trade-offsprotein engineeringantibiotic resistance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Samuel Thompson Yang Zhang Christine Ingle Kimberly A Reynolds Tanja Kortemme |
spellingShingle |
Samuel Thompson Yang Zhang Christine Ingle Kimberly A Reynolds Tanja Kortemme Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzyme eLife proteostasis mutational landscapes activity-stability trade-offs protein engineering antibiotic resistance |
author_facet |
Samuel Thompson Yang Zhang Christine Ingle Kimberly A Reynolds Tanja Kortemme |
author_sort |
Samuel Thompson |
title |
Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzyme |
title_short |
Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzyme |
title_full |
Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzyme |
title_fullStr |
Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzyme |
title_full_unstemmed |
Altered expression of a quality control protease in E. coli reshapes the in vivo mutational landscape of a model enzyme |
title_sort |
altered expression of a quality control protease in e. coli reshapes the in vivo mutational landscape of a model enzyme |
publisher |
eLife Sciences Publications Ltd |
series |
eLife |
issn |
2050-084X |
publishDate |
2020-07-01 |
description |
Protein mutational landscapes are shaped by the cellular environment, but key factors and their quantitative effects are often unknown. Here we show that Lon, a quality control protease naturally absent in common E. coli expression strains, drastically reshapes the mutational landscape of the metabolic enzyme dihydrofolate reductase (DHFR). Selection under conditions that resolve highly active mutants reveals that 23.3% of all single point mutations in DHFR are advantageous in the absence of Lon, but advantageous mutations are largely suppressed when Lon is reintroduced. Protein stability measurements demonstrate extensive activity-stability tradeoffs for the advantageous mutants and provide a mechanistic explanation for Lon’s widespread impact. Our findings suggest possibilities for tuning mutational landscapes by modulating the cellular environment, with implications for protein design and combatting antibiotic resistance. |
topic |
proteostasis mutational landscapes activity-stability trade-offs protein engineering antibiotic resistance |
url |
https://elifesciences.org/articles/53476 |
work_keys_str_mv |
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