Conversion of Glycerol to 3-Hydroxypropanoic Acid by Genetically Engineered Bacillus subtilis
Artikel i vetenskaplig tidskrift, 2017

3-Hydroxypropanoic acid (3-HP) is an important biomass-derivable platform chemical that can be converted into a number of industrially relevant compounds. There have been several attempts to produce 3-HP from renewable sources in cell factories, focusing mainly on Escherichia coli, Klebsiella pneumoniae, and Saccharomyces cerevisiae. Despite the significant progress made in this field, commercially exploitable large-scale production of 3-HP in microbial strains has still not been achieved. In this study, we investigated the potential of Bacillus subtilis as a microbial platform for bioconversion of glycerol into 3-HP. Our recombinant B. subtilis strains overexpress the two-step heterologous pathway containing glycerol dehydratase and aldehyde dehydrogenase from K. pneumoniae. Genetic engineering, driven by in silico optimization, and optimization of cultivation conditions resulted in a 3-HP titer of 10 g/L, in a standard batch cultivation. Our findings provide the first report of successful introduction of the biosynthetic pathway for conversion of glycerol into 3-HP in B. subtilis. With this relatively high titer in batch, and the robustness of B. subtilis in high density fermentation conditions, we expect that our production strains may constitute a solid basis for commercial production of 3-HP.

glycerol kinase knock-out

3-hydroxypropanoic acid

Bacillus subtilis

metabolic engineering

glycerol

Författare

Aida Kalantari

Chalmers, Biologi och bioteknik, Systembiologi

Tao Chen

Chalmers, Biologi och bioteknik, Systembiologi

Boyang Ji

Chalmers, Biologi och bioteknik, Systembiologi

Ivan Andreas Stancik

Chalmers, Biologi och bioteknik, Systembiologi

Vaishnavi Ravikumar

Chalmers, Biologi och bioteknik, Systembiologi

D. Franjevic

Sveuciliste U Zagrebu, Prirodoslovno Matematicki Fakultet

C. Saulou-Berion

Universite Paris Saclay

A. Goelzer

Universite Paris Saclay

Ivan Mijakovic

Chalmers, Biologi och bioteknik, Systembiologi

Frontiers in Microbiology

1664-302X (ISSN)

Vol. 8 638

Drivkrafter

Hållbar utveckling

Ämneskategorier

Kemiska processer

Bioenergi

DOI

10.3389/fmicb.2017.00638