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Model-guided development of an evolutionarily stable yeast chassis.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Meyer, Britta 
Nocon, Justyna 

Abstract

First-principle metabolic modelling holds potential for designing microbial chassis that are resilient against phenotype reversal due to adaptive mutations. Yet, the theory of model-based 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 genome-scale 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 product-specific 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, multi-omics 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 re-routing predicted by the model. Taken together, our modelling and experimental results have implications for the computer-aided design of microbial cell factories.

Description

Keywords

adaptive laboratory evolution, chassis cell, metabolic engineering, multi-objective optimization, systems biology, Citric Acid Cycle, Metabolic Engineering, Metabolomics, Saccharomyces cerevisiae, Succinic Acid

Journal Title

Mol Syst Biol

Conference Name

Journal ISSN

1744-4292
1744-4292

Volume Title

17

Publisher

Springer Science and Business Media LLC