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Luangthongkam P, Blinco JA, Dart P, Callaghan M, Speight R. Comparison of spray-drying and freeze-drying for inoculum production of the probiotic Bacillus amyloliquefaciens strain H57. Food and Bioproducts Processing 2021. [DOI: 10.1016/j.fbp.2021.09.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Navone L, Vogl T, Luangthongkam P, Blinco JA, Luna-Flores CH, Chen X, von Hellens J, Mahler S, Speight R. Disulfide bond engineering of AppA phytase for increased thermostability requires co-expression of protein disulfide isomerase in Pichia pastoris. Biotechnol Biofuels 2021; 14:80. [PMID: 33789740 PMCID: PMC8010977 DOI: 10.1186/s13068-021-01936-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 03/20/2021] [Indexed: 05/07/2023]
Abstract
BACKGROUND Phytases are widely used commercially as dietary supplements for swine and poultry to increase the digestibility of phytic acid. Enzyme development has focused on increasing thermostability to withstand the high temperatures during industrial steam pelleting. Increasing thermostability often reduces activity at gut temperatures and there remains a demand for improved phyases for a growing market. RESULTS In this work, we present a thermostable variant of the E. coli AppA phytase, ApV1, that contains an extra non-consecutive disulfide bond. Detailed biochemical characterisation of ApV1 showed similar activity to the wild type, with no statistical differences in kcat and KM for phytic acid or in the pH and temperature activity optima. Yet, it retained approximately 50% activity after incubations for 20 min at 65, 75 and 85 °C compared to almost full inactivation of the wild-type enzyme. Production of ApV1 in Pichia pastoris (Komagataella phaffi) was much lower than the wild-type enzyme due to the presence of the extra non-consecutive disulfide bond. Production bottlenecks were explored using bidirectional promoters for co-expression of folding chaperones. Co-expression of protein disulfide bond isomerase (Pdi) increased production of ApV1 by ~ 12-fold compared to expression without this folding catalyst and restored yields to similar levels seen with the wild-type enzyme. CONCLUSIONS Overall, the results show that protein engineering for enhanced enzymatic properties like thermostability may result in folding complexity and decreased production in microbial systems. Hence parallel development of improved production strains is imperative to achieve the desirable levels of recombinant protein for industrial processes.
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Affiliation(s)
- Laura Navone
- Faculty of Science, Queensland University of Technology, Brisbane, QLD, Australia.
- ARC Centre of Excellence in Synthetic Biology, Queensland University of Technology, Brisbane, QLD, Australia.
| | - Thomas Vogl
- Department of Computer Science and Applied Mathematics, Weizmann Institute of Science, Rehovot, Israel
| | | | - Jo-Anne Blinco
- Faculty of Science, Queensland University of Technology, Brisbane, QLD, Australia
| | - Carlos H Luna-Flores
- Faculty of Science, Queensland University of Technology, Brisbane, QLD, Australia
- Bioproton Pty Ltd, Brisbane, QLD, Australia
| | | | | | - Stephen Mahler
- ARC Training Centre for Biopharmaceutical Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Robert Speight
- Faculty of Science, Queensland University of Technology, Brisbane, QLD, Australia
- ARC Centre of Excellence in Synthetic Biology, Queensland University of Technology, Brisbane, QLD, Australia
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Navone L, Vogl T, Luangthongkam P, Blinco JA, Luna-Flores C, Chen X, von Hellens J, Speight R. Synergistic optimisation of expression, folding, and secretion improves E. coli AppA phytase production in Pichia pastoris. Microb Cell Fact 2021; 20:8. [PMID: 33494776 PMCID: PMC7836175 DOI: 10.1186/s12934-020-01499-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 12/18/2020] [Indexed: 01/09/2023] Open
Abstract
Background Pichia pastoris (Komagataella phaffii) is an important platform for heterologous protein production due to its growth to high cell density and outstanding secretory capabilities. Recent developments in synthetic biology have extended the toolbox for genetic engineering of P. pastoris to improve production strains. Yet, overloading the folding and secretion capacity of the cell by over-expression of recombinant proteins is still an issue and rational design of strains is critical to achieve cost-effective industrial manufacture. Several enzymes are commercially produced in P. pastoris, with phytases being one of the biggest on the global market. Phytases are ubiquitously used as a dietary supplement for swine and poultry to increase digestibility of phytic acid, the main form of phosphorous storage in grains. Results Potential bottlenecks for expression of E. coli AppA phytase in P. pastoris were explored by applying bidirectional promoters (BDPs) to express AppA together with folding chaperones, disulfide bond isomerases, trafficking proteins and a cytosolic redox metabolism protein. Additionally, transcriptional studies were used to provide insights into the expression profile of BDPs. A flavoprotein encoded by ERV2 that has not been characterised in P. pastoris was used to improve the expression of the phytase, indicating its role as an alternative pathway to ERO1. Subsequent AppA production increased by 2.90-fold compared to the expression from the state of the AOX1 promoter. Discussion The microbial production of important industrial enzymes in recombinant systems can be improved by applying newly available molecular tools. Overall, the work presented here on the optimisation of phytase production in P. pastoris contributes to the improved understanding of recombinant protein folding and secretion in this important yeast microbial production host.
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Affiliation(s)
- Laura Navone
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, Australia. .,ARC Centre of Excellence in Synthetic Biology, Queensland University of Technology, Brisbane, QLD, Australia.
| | - Thomas Vogl
- Department of Computer Science and Applied Mathematics, Weizmann Institute of Science, Rehovot, Israel
| | - Pawarisa Luangthongkam
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, Australia
| | - Jo-Anne Blinco
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, Australia
| | - Carlos Luna-Flores
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, Australia.,Bioproton Pty Ltd, Acacia Ridge, QLD, Australia
| | | | | | - Robert Speight
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, Australia.,ARC Centre of Excellence in Synthetic Biology, Queensland University of Technology, Brisbane, QLD, Australia
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Luangthongkam P, Strong PJ, Syed Mahamud SN, Evans P, Jensen P, Tyson G, Laycock B, Lant PA, Pratt S. The effect of methane and odd-chain fatty acids on 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV) synthesis by a Methylosinus-dominated mixed culture. BIORESOUR BIOPROCESS 2019. [DOI: 10.1186/s40643-019-0285-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
AbstractA methanotrophic community was enriched in a semi-continuous reactor under non-aseptic conditions with methane and ammonia as carbon and nitrogen source. After a year of operation, Methylosinus sp., accounted for 80% relative abundance of the total sequences identified from potential polyhydroxyalkanoates (PHAs) producers, dominated the methane-fed enrichment. Prior to induction of PHA accumulation, cells harvested from the parent reactor contained low level of PHA at 4.0 ± 0.3 wt%. The cells were later incubated in the absence of ammonia with various combinations of methane, propionic acid, and valeric acid to induce biosynthesis of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). Previous studies reported that methanotrophic utilization of odd-chain fatty acids for the production of PHAs requires reducing power from methane oxidation. However, our findings demonstrated that the PHB-containing methanotrophic enrichment does not require methane availability to generate 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV)—when odd-chain fatty acids are presented. The enrichment yielded up to 14 wt% PHA with various mole fractions of 3HV monomer depending on the availability of methane and odd-fatty acids. Overall, the addition of valeric acid resulted in a higher PHA content and a higher 3HV fraction. The highest 3HV fraction (up to 65 mol%) was obtained from the methane–valeric acid experiment, which is higher than those previously reported for PHA-producing methanotrophic mixed microbial cultures.
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Luangthongkam P, Laycock B, Evans P, Lant P, Pratt S. Thermophilic production of poly(3-hydroxybutyrate-co-3-hydrovalerate) by a mixed methane-utilizing culture. N Biotechnol 2019; 53:49-56. [PMID: 31276815 DOI: 10.1016/j.nbt.2019.06.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 06/23/2019] [Accepted: 06/30/2019] [Indexed: 11/24/2022]
Abstract
The production of polyhydroxyalkanoates (PHAs) from methane is limited to mesophiles and thus suffers from high energy requirements for cooling. To address this issue, the use of thermophilic processes is gaining interest, as this strategy may deliver improved economic feasibility for PHA production. This study reports the first thermophilic PHA-producing culture grown on methane at 55 °C in fill-and-draw batch reactors. Harvested cells were incubated with various combinations of methane, propionic acid and valeric acid to assess their capacity for the synthesis of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). Only PHB was produced when fed with methane alone. The addition of odd-carbon-number fatty acids resulted in higher PHA content with 3 HV fractions in the range of 15-99 mol%, depending on the types of fatty acids added. Acetic acid addition enhanced the synthesis of 3HB monomer, but not of 3 HV. On increasing the temperature to 58 °C, PHA productivity was not significantly affected.
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Affiliation(s)
- Pawarisa Luangthongkam
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Bronwyn Laycock
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Paul Evans
- The Australian Centre for Ecogenomics (ACE), The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Paul Lant
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia
| | - Steven Pratt
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland, 4072, Australia.
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Panlawan P, Luangthongkam P, Wiemann LO, Sieber V, Marie E, Durand A, Inprakhon P. Lipase-catalyzed interfacial polymerization of ω-pentadecalactone in aqueous biphasic medium: A mechanistic study. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcatb.2012.11.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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