Metabolic resource allocation in individual microbes determines ecosystem interactions and spatial dynamics.

Metabolic resource allocation in individual microbes determines ecosystem interactions and spatial dynamics.
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DOI:
10.1016/j.celrep.2014.03.070
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发表时间:
2014-05-22
期刊:
影响因子:
8.8
通讯作者:
Segrè D
Segrè D
中科院分区:
生物学1区
文献类型:
--
作者:
Harcombe WR;Riehl WJ;Dukovski I;Granger BR;Betts A;Lang AH;Bonilla G;Kar A;Leiby N;Mehta P;Marx CJ;Segrè D

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The inter-species exchange of metabolites plays a key role in the spatio-temporal dynamics of microbial communities. This raises the question whether ecosystem-level behavior of structured communities can be predicted using genome-scale models of metabolism for multiple organisms. We developed a modeling framework that integrates dynamic flux balance analysis with diffusion on a lattice, and applied it to engineered consortia. First, we predicted, and experimentally confirmed, the species-ratio to which a 2-species mutualistic consortium converges, and the equilibrium composition of a newly engineered 3-member community. We next identified a specific spatial arrangement of colonies, which gives rise to what we term the “eclipse dilemma”: does a competitor placed between a colony and its cross-feeding partner benefit or hurt growth of the original colony? Our experimentally validated finding, that the net outcome is beneficial, highlights the complex nature of metabolic interactions in microbial communities, while at the same time demonstrating their predictability.
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