Model‐guided development of an evolutionarily stable yeast chassis


Change log
Authors
Meyer, Britta 
Nocon, Justyna 
Abstract

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

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, multi‐objective optimization, systems biology
Journal Title
Molecular Systems Biology
Conference Name
Journal ISSN
1744-4292
Volume Title
17
Publisher
Sponsorship
Bundesministerium für Bildung und Forschung (BMBF) (031A343A)
The Foundation for Science and Technology (FCT), Portugal (ERA‐IB‐2/0003/2013, POCI‐01‐0145‐FEDER‐00668, FCOMP‐01‐0124‐FEDER‐027462, PD/BD/52336/2013)