Constitutive homologous expression of phosphoglucomutase and transaldolase increases the metabolic flux of Fusarium oxysporum

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Anasontzis, George E,1980Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Department of Chemical and Biological Engineering (författare)

Constitutive homologous expression of phosphoglucomutase and transaldolase increases the metabolic flux of Fusarium oxysporum

Artikel/kapitelEngelska2014

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2014-03-20
Springer Science and Business Media LLC,2014
electronicrdacarrier

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LIBRIS-ID:oai:research.chalmers.se:c3dac53a-6c29-4248-9e08-d52f856a292f
https://research.chalmers.se/publication/216399URI
https://doi.org/10.1186/1475-2859-13-43DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-9075URI

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Språk:engelska
Sammanfattning på:engelska

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Validerad; 2014; 20140315 (pauchr)
Background: Fusarium oxysporum is among the few filamentous fungi that have been reported of being able to directly ferment biomass to ethanol in a consolidated bioprocess. Understanding its metabolic pathways and their limitations can provide some insights on the genetic modifications required to enhance its growth and subsequent fermentation capability. In this study, we investigated the hypothesis reported previously that phosphoglucomutase and transaldolase are metabolic bottlenecks in the glycolysis and pentose phosphate pathway of the F. oxysporum metabolism.Results: Both enzymes were homologously overexpressed in F. oxysporum F3 using the gpdA promoter of Aspergillus nidulans for constitutive expression. Transformants were screened for their phosphoglucomutase and transaldolase genes expression levels with northern blot. The selected transformant exhibited high mRNA levels for both genes, as well as higher specific activities of the corresponding enzymes, compared to the wild type. It also displayed more than 20 and 15% higher specific growth rate upon aerobic growth on glucose and xylose, respectively, as carbon sources and 30% higher biomass to xylose yield. The determination of the relative intracellular amino and non-amino organic acid concentrations at the end of growth on glucose revealed higher abundance of most determined metabolites between 1.5- and 3-times in the recombinant strain compared to the wild type. Lower abundance of the determined metabolites of the Krebs cycle and an 68-fold more glutamate were observed at the end of the cultivation, when xylose was used as carbon source.Conclusions: Homologous overexpression of phosphoglucomutase and transaldolase in F. oxysporum was shown to enhance the growth characteristics of the strain in both xylose and glucose in aerobic conditions. The intracellular metabolites profile indicated how the changes in the metabolome could have resulted in the observed growth characteristics. © 2014 Anasontzis et al.; licensee BioMed Central Ltd.

Ämnesord och genrebeteckningar

MEDICIN OCH HÄLSOVETENSKAP Medicinsk bioteknologi Annan medicinsk bioteknologi hsv//swe
MEDICAL AND HEALTH SCIENCES Medical Biotechnology Other Medical Biotechnology hsv//eng
TEKNIK OCH TEKNOLOGIER Industriell bioteknik Bioprocessteknik hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bioprocess Technology hsv//eng
Metabolic engineering
Transaldolase
Fungi
Metabolic flux
Glycolysis
Phosphoglucomutase
PPP
Biokemisk processteknik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Kourtoglou, E.National Technical University of Athens (NTUA),BIOtechMASS Unit, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens (författare)
Mamma, D.National Technical University of Athens (NTUA),BIOtechMASS Unit, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens (författare)
Villas-Bôas, S.G.R.University of Auckland,Centre for Microbial Innovation, School of Biological Sciences, The University of Auckland (författare)
Hatzinikolaou, D.G.University of Athens,Microbial Biotechnology Unit, Sector of Botany, Department of Biology, National and Kapodistrian University of Athens (författare)
Christakopoulos, PaulLuleå tekniska universitet,Kemiteknik(Swepub:ltu)pauchr (författare)
Chalmers tekniska högskolaChalmers University of Technology, Department of Chemical and Biological Engineering (creator_code:org_t)

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Ingår i:Microbial Cell Factories: Springer Science and Business Media LLC13:11475-2859

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Av författaren/redakt...: Anasontzis, Geor ...; Kourtoglou, E.; Mamma, D.; Villas-Bôas, S.G ...; Hatzinikolaou, D ...; Christakopoulos, ...

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