Development of engineered Candida tropicalis strain for efficient corncob-based xylitol-ethanol biorefinery.
C. tropicalis
Corncob
Strain development
XDH
Xylitol
Journal
Microbial cell factories
ISSN: 1475-2859
Titre abrégé: Microb Cell Fact
Pays: England
ID NLM: 101139812
Informations de publication
Date de publication:
06 Oct 2023
06 Oct 2023
Historique:
received:
02
08
2023
accepted:
30
08
2023
medline:
1
11
2023
pubmed:
7
10
2023
entrez:
6
10
2023
Statut:
epublish
Résumé
Xylitol has a wide range of applications in the pharmaceuticals, cosmetic, food and beverage industry. Microbial xylitol production reduces the risk of contamination and is considered as environment friendly and sustainable compared to the chemical method. In this study, random mutagenesis and genetic engineering approaches were employed to develop Candida tropicalis strains with reduced xylitol dehydrogenase (XDH) activity to eliminate co-substrate requirement for corn cob-based xylitol-ethanol biorefinery. The results suggest that when pure xylose (10% w/v) was fermented in bioreactor, the Ethyl methane sulfonate (EMS) mutated strain (C. tropicalis K2M) showed 9.2% and XYL2 heterozygous (XYL2/xyl2Δ::FRT) strain (C. tropicalis K21D) showed 16% improvement in xylitol production compared to parental strain (C. tropicalis K2). Furthermore, 1.5-fold improvement (88.62 g/L to 132 g/L) in xylitol production was achieved by C. tropicalis K21D after Response Surface Methodology (RSM) and one factor at a time (OFAT) applied for media component optimization. Finally, corncob hydrolysate was tested for xylitol production in biorefinery mode, which leads to the production of 32.6 g/L xylitol from hemicellulosic fraction, 32.0 g/L ethanol from cellulosic fraction and 13.0 g/L animal feed. This work, for the first time, illustrates the potential of C. tropicalis K21D as a microbial cell factory for efficient production of xylitol and ethanol via an integrated biorefinery framework by utilising lignocellulosic biomass with minimum waste generation.
Sections du résumé
BACKGROUND
BACKGROUND
Xylitol has a wide range of applications in the pharmaceuticals, cosmetic, food and beverage industry. Microbial xylitol production reduces the risk of contamination and is considered as environment friendly and sustainable compared to the chemical method. In this study, random mutagenesis and genetic engineering approaches were employed to develop Candida tropicalis strains with reduced xylitol dehydrogenase (XDH) activity to eliminate co-substrate requirement for corn cob-based xylitol-ethanol biorefinery.
RESULTS
RESULTS
The results suggest that when pure xylose (10% w/v) was fermented in bioreactor, the Ethyl methane sulfonate (EMS) mutated strain (C. tropicalis K2M) showed 9.2% and XYL2 heterozygous (XYL2/xyl2Δ::FRT) strain (C. tropicalis K21D) showed 16% improvement in xylitol production compared to parental strain (C. tropicalis K2). Furthermore, 1.5-fold improvement (88.62 g/L to 132 g/L) in xylitol production was achieved by C. tropicalis K21D after Response Surface Methodology (RSM) and one factor at a time (OFAT) applied for media component optimization. Finally, corncob hydrolysate was tested for xylitol production in biorefinery mode, which leads to the production of 32.6 g/L xylitol from hemicellulosic fraction, 32.0 g/L ethanol from cellulosic fraction and 13.0 g/L animal feed.
CONCLUSIONS
CONCLUSIONS
This work, for the first time, illustrates the potential of C. tropicalis K21D as a microbial cell factory for efficient production of xylitol and ethanol via an integrated biorefinery framework by utilising lignocellulosic biomass with minimum waste generation.
Identifiants
pubmed: 37803395
doi: 10.1186/s12934-023-02190-3
pii: 10.1186/s12934-023-02190-3
pmc: PMC10557352
doi:
Substances chimiques
Xylitol
VCQ006KQ1E
Ethanol
3K9958V90M
Xylose
A1TA934AKO
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
201Subventions
Organisme : Science and Engineering Research Board
ID : PDF/2020/002290
Organisme : Indian Council of Medical Research
ID : Myco/Fell/3/2022 ECD-II
Organisme : DBT-Pan IIT Centre for Bioenergy
ID : BT/PB/Centre/03/ICGEB/2011 Phase II
Informations de copyright
© 2023. BioMed Central Ltd., part of Springer Nature.
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