Modelāguided development of an evolutionarily stable yeast chassis
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Abstract: Firstāprinciple metabolic modelling holds potential for designing microbial chassis that are resilient against phenotype reversal due to adaptive mutations. Yet, the theory of modelābased chassis design has rarely been put to rigorous experimental test. Here, we report the development of Saccharomyces cerevisiae chassis strains for dicarboxylic acid production using genomeāscale metabolic modelling. The chassis strains, albeit geared for higher flux towards succinate, fumarate and malate, do not appreciably secrete these metabolites. As predicted by the model, introducing productāspecific TCA cycle disruptions resulted in the secretion of the corresponding acid. Adaptive laboratory evolution further improved production of succinate and fumarate, demonstrating the evolutionary robustness of the engineered cells. In the case of malate, multiāomics analysis revealed a flux bypass at peroxisomal malate dehydrogenase that was missing in the yeast metabolic model. In all three cases, flux balance analysis integrating transcriptomics, proteomics and metabolomics data confirmed the flux reārouting predicted by the model. Taken together, our modelling and experimental results have implications for the computerāaided design of microbial cell factories.
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Funder: European Molecular Biology Laboratory (EMBL); Id: http://dx.doi.org/10.13039/100013060
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The Foundation for Science and Technology (FCT), Portugal (ERAāIBā2/0003/2013, POCIā01ā0145āFEDERā00668, FCOMPā01ā0124āFEDERā027462, PD/BD/52336/2013)