Kinetic model of Clostridium beijerinckii's Acetone-Butanol-Ethanol fermentation considering metabolically diverse cell types

Marcelo Rivas-Astroza, Iván Paredes, Karlo Guerrero, Silvia Mau, Julián Quintero, Juan Carlos Gentina, Raúl Conejeros, Germán Aroca

Research output: Contribution to journalArticlepeer-review

Abstract

Clostridium beijerinckii population branches into metabolically diverse cell types in batch cultures. Here, we present a new kinetic model of C. beijerinckii's Acetone-Butanol-Ethanol fermentation that considers three cell types: producers of acids (acidogenic), consumer of acids and producers of solvents (solventogenic), and spores cells. The model accurately recapitulates batch culture data. Also, the model estimates cell type-specific kinetic parameters, which can be helpful to improve the operation of the ABE fermentation and give a framework to study acidogenic and solventogenic metabolic pathways. To exemplify the latter, we used a constraint-based model to study how the ABE pathways are used among acidogenic and solventogenic cell types. We found that among both cell types, glycolytic production of ATP and consumption of NAD+ varies widely during the fermentation, with their maximum production/consumption rates happening when acidogenic and solventogenic growth rates were at their highest. However, acidogenic cells use the ABE pathway to contribute with an extra 12.5% of the total production of ATP, whereas solventogenic cell types use the ABE pathway to supply more than 75% of the demand for NAD+, alternating between the production of lactate and butyrate, being both coupled to the production of NAD+.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalJournal of Biotechnology
Volume342
DOIs
StatePublished - 10 Dec 2021
Externally publishedYes

Keywords

  • ABE fermentation
  • Clostridium beijerinckii
  • Fermentation modelling
  • Flux balance analysis

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