Comparison of mcl-poly(3-hydroxyalkanoates) synthesis by different pseudomonas putida strains from crude glycerol: Citrate accumulates at high titer under PHA-producing conditions

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dc.contributor.authorPoblete-Castro, Ignacio
dc.contributor.authorBinger, Danielle
dc.contributor.authorOehlert, Rene
dc.contributor.authorRohde, Manfred
dc.date.accessioned2022-12-27T15:02:09Z
dc.date.available2022-12-27T15:02:09Z
dc.date.issued2014
dc.descriptionIndexación: Scopuses
dc.description.abstractBackground: Achieving a sustainable society requires, among other things, the use of renewable feedstocks to replace chemicals obtained from petroleum-derived compounds. Crude glycerol synthesized inexpensively as a byproduct of biodiesel production is currently considered a waste product, which can potentially be converted into value-added compounds by bacterial fermentation. This study aimed at evaluating several characterized P. putida strains to produce medium-chain-length poly(3-hydroxyalkanoates) (mcl-PHA) using raw glycerol as the only carbon/energy source. Results: Among all tested strains, P. putida KT2440 most efficiently synthesized mcl-PHA under nitrogen-limiting conditions, amassing more than 34% of its cell dry weight as PHA. Disruption of the PHA depolymerase gene (phaZ) in P. putida KT2440 enhanced the biopolymer titer up to 47% PHA (%wt/wt). The low biomass and PHA titer found in the mutant strain and the wild-type strain KT2440 seems to be triggered by the high production of the side-product citrate during the fermentation process which shows a high yield of 0.6 g/g. Conclusions: Overall, this work demonstrates the importance of choosing an appropriate microbe for the synthesis of mcl-PHA from waste materials, and a close inspection of the cell metabolism in order to identify undesired compounds that diminish the availability of precursors in the synthesis of biopolymers such as polyhydroxyalkanoates. Future metabolic engineering works should focus on reducing the production of citrate in order to modulate resource allocation in the cell's metabolism of P. putida, and finally increase the biopolymer production. © 2014 Poblete-Castro et al.; licensee BioMed Central.es
dc.identifier.citationBMC Biotechnology Volume 14, Issue 1December 23, 2014 Article number 962es
dc.identifier.doi10.1186/s12896-014-0110-z
dc.identifier.issn1472-6750
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/25557
dc.identifier.urihttps://bmcbiotechnol.biomedcentral.com/articles/10.1186/s12896-014-0110-z
dc.language.isoenes
dc.publisherBioMed Central Ltd.es
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectCitratees
dc.subjectMcl-polyhydroxyalkanoateses
dc.subjectMetabolic engineeringes
dc.subjectPHA depolymerasees
dc.subjectPseudomonas putida strainses
dc.subjectRaw glyceroles
dc.titleComparison of mcl-poly(3-hydroxyalkanoates) synthesis by different pseudomonas putida strains from crude glycerol: Citrate accumulates at high titer under PHA-producing conditionses
dc.typeArtículoes
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