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  4. Large-scale kinetic metabolic models of Pseudomonas putida KT2440 for consistent design of metabolic engineering strategies
 
research article

Large-scale kinetic metabolic models of Pseudomonas putida KT2440 for consistent design of metabolic engineering strategies

Tokic, Milenko  
•
Hatzimanikatis, Vassily  
•
Miskovic, Ljubisa  
February 28, 2020
Biotechnology for Biofuels

Background: Pseudomonas putida is a promising candidate for the industrial production of biofuels and biochemicals because of its high tolerance to toxic compounds and its ability to grow on a wide variety of substrates. Engineering this organism for improved performances and predicting metabolic responses upon genetic perturbations requires reliable descriptions of its metabolism in the form of stoichiometric and kinetic models. Results: In this work, we developed kinetic models of P. putida to predict the metabolic phenotypes and design metabolic engineering interventions for the production of biochemicals. The developed kinetic models contain 775 reactions and 245 metabolites. Furthermore, we introduce here a novel set of constraints within thermodynamics-based flux analysis that allow for considering concentrations of metabolites that exist in several compartments as separate entities. We started by a gap-filling and thermodynamic curation of iJN1411, the genome-scale model of P. putida KT2440. We then systematically reduced the curated iJN1411 model, and we created three core stoichiometric models of different complexity that describe the central carbon metabolism of P. putida. Using the medium complex-ity core model as a scaffold, we generated populations of large-scale kinetic models for two studies. In the first study, the developed kinetic models successfully captured the experimentally observed metabolic responses to several single-gene knockouts of a wild-type strain of P. putida KT2440 growing on glucose. In the second study, we used the developed models to propose metabolic engineering interventions for improved robustness of this organism to the stress condition of increased ATP demand. Conclusions: The study demonstrates the potential and predictive capabilities of the kinetic models that allow for rational design and optimization of recombinant P. putida strains for improved production of biofuels and biochemi-cals. The curated genome-scale model of P. putida together with the developed large-scale stoichiometric and kinetic models represents a significant resource for researchers in industry and academia.

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Type
research article
DOI
10.1186/s13068-020-1665-7
Author(s)
Tokic, Milenko  
Hatzimanikatis, Vassily  
Miskovic, Ljubisa  
Date Issued

2020-02-28

Published in
Biotechnology for Biofuels
Volume

13

Issue

33

Start page

1

End page

19

Subjects

Pseudomonas putida

•

Large-scale and genome-scale kinetic models

•

Nonlinearity

•

Metabolism

•

Thermodynamics

•

Kinetic parameters

•

Uncertainty

•

Metabolic engineering

•

Stress conditions

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCSB  
RelationURL/DOI

IsSupplementedBy

https://zenodo.org/record/3528197#.XllBhEN7nUI

IsSupplementedBy

10.5281/zenodo.3528197
Available on Infoscience
February 28, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/166566
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