Engineering of artificial microbial consortia of Ralstonia eutropha and Bacillus subtilis for poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymer production from sugarcane sugar without precursor feeding.

Ralstonia eutropha is a well-known microbe reported for polyhydroxyalkonate (PHA) production, and unable to utilize sucrose as carbon source. Two strains, Ralstonia eutropha H16 and Ralstonia eutropha 5119 were co-cultured with sucrose hydrolyzing microbes (Bacillus subtilis and Bacillus amyloliquefaciens) for PHA production. Co-culture of B. subtilis:R. eutropha 5119 (BS:RE5) resulted in best PHA production (45% w/w dcw). Optimization of the PHA production process components through response surface resulted in sucrose: NH4Cl:B. subtilis: R. eutropha (3.0:0.17:0.10:0.190). Along with the hydrolysis of sucrose, B. subtilis also ferments sugars into organic acid (propionic acid), which acts as a precursor for HV monomer unit. Microbial consortia of BS:RE5 when cultured in optimized media led to the production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(3HB-co-3HV) with 66% w/w of dcw having 16 mol% HV fraction. This co-culture strategy overcomes the need for metabolic engineering of R. eutropha for sucrose utilization, and addition of precursor for copolymer production.

• Publication year

  2018

• Venue

  Bioresource Technology

• Publication date

  2018-06-01

• Fields of study

  Medicine, Chemistry, Engineering, Environmental Science

• Identifiers
  DOI 10.1016/j.biortech.2018.02.056PMID 29486411
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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