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Title: Parallel Mutations Result in a Wide Range of Cooperation and Community Consequences in a Two-Species Bacterial Consortium

Abstract

Multi-species microbial communities play a critical role in human health, industry, and waste remediation. Recently, the evolution of synthetic consortia in the laboratory has enabled adaptation to be addressed in the context of interacting species. Using an engineered bacterial consortium,we repeatedly evolved cooperative genotypes and examined both the predictability of evolution and the phenotypes that determinecommunity dynamics. Eight Salmonella enterica serovar Typhimurium strains evolved methionine excretion sufficient to support growth of an Escherichia coli methionine auxotroph, from whom they required excreted growth substrates. Non-synonymousmutations in metA, encoding homoserine trans-succinylase (HTS), were detected in each evolved S. enterica methionine cooperator and were shown to be necessary for cooperative consortia growth. Molecular modeling was used to predict that most of the non-synonymous mutations slightly increase the binding affinity for HTS homodimer formation. Despite this genetic parallelism and trend of increasing protein binding stability, these metA alleles gave rise to a wide range of phenotypic diversity in termsof individual versus group benefit. The cooperators with the highest methionine excretion permitted nearly two-fold faster consortia growth and supported the highest fraction of E. coli, yet also had the slowest individual growth rates compared to less cooperative strains. Thus, although the genetic basis of adaptationmore » was quite similar across independent origins of cooperative phenotypes, quantitative measurements of metabolite production were required to predict either the individual-level growth consequences or how these propagate to community-level behavior.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1337793
Alternate Identifier(s):
OSTI ID: 1436492
Grant/Contract Number:  
SC0006731
Resource Type:
Published Article
Journal Name:
PLoS ONE
Additional Journal Information:
Journal Name: PLoS ONE Journal Volume: 11 Journal Issue: 9; Journal ID: ISSN 1932-6203
Publisher:
Public Library of Science (PLoS)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Douglas, Sarah M., Chubiz, Lon M., Harcombe, William R., Ytreberg, F. Marty, Marx, Christopher J., and Brown, ed., Sam Paul. Parallel Mutations Result in a Wide Range of Cooperation and Community Consequences in a Two-Species Bacterial Consortium. United States: N. p., 2016. Web. doi:10.1371/journal.pone.0161837.
Douglas, Sarah M., Chubiz, Lon M., Harcombe, William R., Ytreberg, F. Marty, Marx, Christopher J., & Brown, ed., Sam Paul. Parallel Mutations Result in a Wide Range of Cooperation and Community Consequences in a Two-Species Bacterial Consortium. United States. https://doi.org/10.1371/journal.pone.0161837
Douglas, Sarah M., Chubiz, Lon M., Harcombe, William R., Ytreberg, F. Marty, Marx, Christopher J., and Brown, ed., Sam Paul. Mon . "Parallel Mutations Result in a Wide Range of Cooperation and Community Consequences in a Two-Species Bacterial Consortium". United States. https://doi.org/10.1371/journal.pone.0161837.
@article{osti_1337793,
title = {Parallel Mutations Result in a Wide Range of Cooperation and Community Consequences in a Two-Species Bacterial Consortium},
author = {Douglas, Sarah M. and Chubiz, Lon M. and Harcombe, William R. and Ytreberg, F. Marty and Marx, Christopher J. and Brown, ed., Sam Paul},
abstractNote = {Multi-species microbial communities play a critical role in human health, industry, and waste remediation. Recently, the evolution of synthetic consortia in the laboratory has enabled adaptation to be addressed in the context of interacting species. Using an engineered bacterial consortium,we repeatedly evolved cooperative genotypes and examined both the predictability of evolution and the phenotypes that determinecommunity dynamics. Eight Salmonella enterica serovar Typhimurium strains evolved methionine excretion sufficient to support growth of an Escherichia coli methionine auxotroph, from whom they required excreted growth substrates. Non-synonymousmutations in metA, encoding homoserine trans-succinylase (HTS), were detected in each evolved S. enterica methionine cooperator and were shown to be necessary for cooperative consortia growth. Molecular modeling was used to predict that most of the non-synonymous mutations slightly increase the binding affinity for HTS homodimer formation. Despite this genetic parallelism and trend of increasing protein binding stability, these metA alleles gave rise to a wide range of phenotypic diversity in termsof individual versus group benefit. The cooperators with the highest methionine excretion permitted nearly two-fold faster consortia growth and supported the highest fraction of E. coli, yet also had the slowest individual growth rates compared to less cooperative strains. Thus, although the genetic basis of adaptation was quite similar across independent origins of cooperative phenotypes, quantitative measurements of metabolite production were required to predict either the individual-level growth consequences or how these propagate to community-level behavior.},
doi = {10.1371/journal.pone.0161837},
journal = {PLoS ONE},
number = 9,
volume = 11,
place = {United States},
year = {Mon Sep 12 00:00:00 EDT 2016},
month = {Mon Sep 12 00:00:00 EDT 2016}
}

Journal Article:
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https://doi.org/10.1371/journal.pone.0161837

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