Repository logo
 

Modelā€guided development of an evolutionarily stable yeast chassis

Published version
Peer-reviewed

Change log

Authors

Meyer, Britta 
Nocon, Justyna 

Abstract

Abstract: Firstā€principle metabolic modelling holds potential for designing microbial chassis that are resilient against phenotype reversal due to adaptive mutations. Yet, the theory of modelā€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 genomeā€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 productā€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, multiā€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 reā€routing predicted by the model. Taken together, our modelling and experimental results have implications for the computerā€aided design of microbial cell factories.

Description

Funder: European Molecular Biology Laboratory (EMBL); Id: http://dx.doi.org/10.13039/100013060

Keywords

EMBO41, EMBO21, EMBO23, Article, Articles, adaptive laboratory evolution, chassis cell, metabolic engineering, multiā€objective optimization, systems biology

Journal Title

Molecular Systems Biology

Conference Name

Journal ISSN

1744-4292

Volume Title

17

Publisher

Sponsorship
Bundesministerium fĆ¼r Bildung und Forschung (BMBF) (031A343A)
The Foundation for Science and Technology (FCT), Portugal (ERAā€IBā€2/0003/2013, POCIā€01ā€0145ā€FEDERā€00668, FCOMPā€01ā€0124ā€FEDERā€027462, PD/BD/52336/2013)