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Co-expression of thermophilic pectinases in a single host for cost-effective pectin bioconversion into D-galacturonic acid

Flores-Fernández, Carol N; Cárdenas-Fernández, Max; Lye, Gary J; Ward, John M; (2023) Co-expression of thermophilic pectinases in a single host for cost-effective pectin bioconversion into D-galacturonic acid. Frontiers in Catalysis , 3 , Article 1112154. 10.3389/fctls.2023.1112154. Green open access

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Abstract

Co-expression of enzymes allow to produce multiple enzymes in a single host, representing a cost-effective alternative in biocatalytic processes which can be used for pectin bioconversion. Pectin-rich biomass is an abundant by-product from the fruit and sugar industries that is usually disposed in landfill or sold as a low value feedstock. The aim of this work was to co-express a thermophilic pectin methyl esterase (PME) and exo-polygalacturonases (exo-PGs) in a single host for pectin bioconversion into D-galacturonic acid (GalA) using different pectic substrates such as apple, citrus and sugar beet pectin. To achieve this, a PME from Bacillus licheniformis (BLI09) with either an exo-PG from Thermotoga maritima (TMA01) or from Bacillus licheniformis (BLI04) were cloned in pETDuet-1 and co-expressed in E. coli BL21 (DE3). Four co-expression plasmids containing both pectinases were constructed and factors such as the effect of the genes’ cloning order and their expression were evaluated. Co-expression constructs 3 and 4 (pETDuet-TMA01-BLI09 and pETDuet-BLI04-BLI09, respectively) showed better expression of both pectinases compared to co-expression constructs 1 and 2 (pETDuet-BLI09-TMA01 and pETDuet-BLI09-BLI04, respectively). Co-expression constructs 3 and 4 were the most efficient for pectin bioconversion into GalA reaching 3 and 2.5 mM GalA, respectively from apple and citrus pectin after 4 h reaction. In conclusion, this work demonstrates that the co-expression of pectinases can potentially contribute to reduce the cost associated to their production and purification as well as to increase their applicability for exploiting pectin-rich biomass to obtain bio-based chemicals.

Type: Article
Title: Co-expression of thermophilic pectinases in a single host for cost-effective pectin bioconversion into D-galacturonic acid
Open access status: An open access version is available from UCL Discovery
DOI: 10.3389/fctls.2023.1112154
Publisher version: https://doi.org/10.3389/fctls.2023.1112154
Language: English
Additional information: Copyright © 2023 Flores-Fernández, Cárdenas-Fernández, Lye and Ward. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (http://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Keywords: enzymes co-expression, thermophilic pectinases, pectin, D-galacturonic acid, pectin methyl esterases, exo-polygalacturonases
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10166136
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