Open microbiome dominated by Clostridium and Eubacterium converts methanol into i-butyrate and n-butyrate

Shengle Huang, Robbert Kleerebezem, Korneel Rabaey, Ramon Ganigué

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Isobutyrate (i-butyrate) is a versatile platform chemical, whose acid form is used as a precursor of plastic and emulsifier. It can be produced microbially either using genetically engineered organisms or via microbiomes, in the latter case starting from methanol and short-chain carboxylates. This opens the opportunity to produce i-butyrate from non-sterile feedstocks. Little is known on the ecology and process conditions leading to i-butyrate production. In this study, we steered i-butyrate production in a bioreactor fed with methanol and acetate under various conditions, achieving maximum i-butyrate productivity of 5.0 mM day−1, with a concurrent production of n-butyrate of 7.9 mM day−1. The production of i-butyrate was reversibly inhibited by methanogenic inhibitor 2-bromoethanesulfonate. The microbial community data revealed the co-dominance of two major OTUs during co-production of i-butyrate and n-butyrate in two distinctive phases throughout a period of 54 days and 28 days, respectively. The cross-comparison of product profile with microbial community composition suggests that the relative abundance of Clostridium sp. over Eubacterium sp. is correlated with i-butyrate productivity over n-butyrate productivity.

Original languageEnglish
Pages (from-to)5119-5131
Number of pages13
JournalApplied Microbiology and Biotechnology
Volume104
Issue number11
DOIs
Publication statusPublished - 2020

Keywords

  • Carboxylate platform
  • Chain elongation
  • Isobutyrate production
  • Methanol
  • Mixed culture fermentation

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