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Hur DH, Lee J, Park SJ, Jeong KJ. Engineering of Pseudomonas putida to produce medium-chain-length polyhydroxyalkanoate from crude glycerol. Int J Biol Macromol 2024; 281:136411. [PMID: 39393726 DOI: 10.1016/j.ijbiomac.2024.136411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2024] [Revised: 09/14/2024] [Accepted: 10/06/2024] [Indexed: 10/13/2024]
Abstract
The development of biodegradable polymers is crucial for addressing environmental issues and waste management challenges, and a medium-chain-length polyhydroxyalkanoate(MCL-PHA) exhibits significant application potential in diverse industrial and environmental contexts owing to its versatility and biodegradability. Here, Pseudomonas putida was metabolically engineered to produce MCL-PHA from crude glycerol. To increase the precursor pool, we first deleted the phaC1ZC2 operon and introduced a plasmid-based overexpression of phaC2 and phaG, and the MCL-PHA content derived from glycerol increased to 18.27 wt% at 60 h. Subsequently, by optimizing the acoA expression through promoter selection and UTR design, the MCL-PHA content further increased to 19.93 wt% at 72 h. Additionally, a notable increase in MCL-PHA production was achieved using PhaC2 designed to have no substrate-trapping effect (PhaC2A477A478). This improvement was guided by filling structural data gaps using AlphaFold2 and docking simulations that revealed the substrate-trapping phenomenon. High-level production of MCL-PHA was achieved through fed-batch fermentation using the final engineered P. putida from refined glycerol, which yielded 34.9 g/L of MCL-PHA with 44.64 wt% at 180 h. Furthermore, using crude glycerol as the sole carbon source enabled the production of 49.5 g/L of MCL-PHA with 45.41 wt% at 180 h in fed-batch culture.
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Affiliation(s)
- Dong Hoon Hur
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Joonyoung Lee
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Si Jae Park
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea.
| | - Ki Jun Jeong
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea; Graduate School of Engineering Biology, KAIST, Daejeon 34141, Republic of Korea; KAIST Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
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2
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Casey D, Diaz-Garcia L, Yu M, Tee KL, Wong TS. From Knallgas Bacterium to Promising Biomanufacturing Host: The Evolution of Cupriavidus necator. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2024. [PMID: 39363001 DOI: 10.1007/10_2024_269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2024]
Abstract
The expanding field of synthetic biology requires diversification of microbial chassis to expedite the transition from a fossil fuel-dependent economy to a sustainable bioeconomy. Relying exclusively on established model organisms such as Escherichia coli and Saccharomyces cerevisiae may not suffice to drive the profound advancements needed in biotechnology. In this context, Cupriavidus necator, an extraordinarily versatile microorganism, has emerged as a potential catalyst for transformative breakthroughs in industrial biomanufacturing. This comprehensive book chapter offers an in-depth review of the remarkable technological progress achieved by C. necator in the past decade, with a specific focus on the fields of molecular biology tools, metabolic engineering, and innovative fermentation strategies. Through this exploration, we aim to shed light on the pivotal role of C. necator in shaping the future of sustainable bioprocessing and bioproduct development.
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Affiliation(s)
- Daniel Casey
- School of Chemical, Materials and Biological Engineering, The University of Sheffield, Sheffield, UK
| | - Laura Diaz-Garcia
- School of Chemical, Materials and Biological Engineering, The University of Sheffield, Sheffield, UK
| | - Mincen Yu
- School of Chemical, Materials and Biological Engineering, The University of Sheffield, Sheffield, UK
| | - Kang Lan Tee
- School of Chemical, Materials and Biological Engineering, The University of Sheffield, Sheffield, UK
- Evolutor Ltd, The Innovation Centre, Sheffield, UK
| | - Tuck Seng Wong
- School of Chemical, Materials and Biological Engineering, The University of Sheffield, Sheffield, UK.
- Evolutor Ltd, The Innovation Centre, Sheffield, UK.
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science & Technology Development Agency (NSTDA), Khlong Nueng, Khlong Luang, Pathum Thani, Thailand.
- School of Pharmacy, Bandung Institute of Technology, Bandung, West Java, Indonesia.
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3
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Oh SJ, Shin Y, Oh J, Kim S, Lee Y, Choi S, Lim G, Joo JC, Jeon JM, Yoon JJ, Bhatia SK, Ahn J, Kim HT, Yang YH. Strategic Use of Vegetable Oil for Mass Production of 5-Hydroxyvalerate-Containing Polyhydroxyalkanoate from δ-Valerolactone by Engineered Cupriavidus necator. Polymers (Basel) 2024; 16:2773. [PMID: 39408484 PMCID: PMC11478691 DOI: 10.3390/polym16192773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2024] [Revised: 09/25/2024] [Accepted: 09/26/2024] [Indexed: 10/20/2024] Open
Abstract
Although efforts have been undertaken to produce polyhydroxyalkanoates (PHA) with various monomers, the low yield of PHAs because of complex metabolic pathways and inhibitory substrates remains a major hurdle in their analyses and applications. Therefore, we investigated the feasibility of mass production of PHAs containing 5-hydroxyvalerate (5HV) using δ-valerolactone (DVL) without any pretreatment along with the addition of plant oil to achieve enough biomass. We identified that PhaCBP-M-CPF4, a PHA synthase, was capable of incorporating 5HV monomers and that C. necator PHB-4 harboring phaCBP-M-CPF4 synthesized poly(3HB-co-3HHx-co-5HV) in the presence of bean oil and DVL. In fed-batch fermentation, the supply of bean oil resulted in the synthesis of 49 g/L of poly(3HB-co-3.7 mol% 3HHx-co-5.3 mol%5HV) from 66 g/L of biomass. Thermophysical studies showed that 3HHx was effective in increasing the elongation, whereas 5HV was effective in decreasing the melting point. The contact angles of poly(3HB-co-3HHx-co-5HV) and poly(3HB-co-3HHx) were 109 and 98°, respectively. In addition, the analysis of microbial degradation confirmed that poly(3HB-co-3HHx-co-5HV) degraded more slowly (82% over 7 days) compared to poly(3HB-co-3HHx) (100% over 5 days). Overall, the oil-based fermentation strategy helped produce more PHA, and the mass production of novel PHAs could provide more opportunities to study polymer properties.
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Affiliation(s)
- Suk-Jin Oh
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
| | - Yuni Shin
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
| | - Jinok Oh
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
| | - Suwon Kim
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
| | - Yeda Lee
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
| | - Suhye Choi
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
| | - Gaeun Lim
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
| | - Jeong-Chan Joo
- Department of Chemical Engineering, Kyung Hee University, Yongin-si 17104, Gyeonggi-do, Republic of Korea;
| | - Jong-Min Jeon
- Department of Green & Sustainable Materials R&D, Research Institute of Clean Manufacturing System, Korea Institute of Industrial Technology (KITECH), Cheonan-si 31056, Chungcheongnam-do, Republic of Korea; (J.-M.J.); (J.-J.Y.)
| | - Jeong-Jun Yoon
- Department of Green & Sustainable Materials R&D, Research Institute of Clean Manufacturing System, Korea Institute of Industrial Technology (KITECH), Cheonan-si 31056, Chungcheongnam-do, Republic of Korea; (J.-M.J.); (J.-J.Y.)
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
- Institute for Ubiquitous Information Technology and Application, Konkuk University, Seoul 05029, Republic of Korea
| | - Jungoh Ahn
- Biotechnology Process Engineering Center, Korea Research Institute Bioscience Biotechnology (KRIBB), Cheongju-si 28116, Chungcheongbuk-do, Republic of Korea;
| | - Hee-Taek Kim
- Department of Food Science and Technology, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Yung-Hun Yang
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea; (S.-J.O.); (Y.S.); (J.O.); (S.K.); (Y.L.); (S.C.); (G.L.); (S.K.B.)
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Santolin L, Riedel SL, Brigham CJ. Synthetic biology toolkit of Ralstonia eutropha (Cupriavidus necator). Appl Microbiol Biotechnol 2024; 108:450. [PMID: 39207499 PMCID: PMC11362209 DOI: 10.1007/s00253-024-13284-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2024] [Revised: 08/09/2024] [Accepted: 08/12/2024] [Indexed: 09/04/2024]
Abstract
Synthetic biology encompasses many kinds of ideas and techniques with the common theme of creating something novel. The industrially relevant microorganism, Ralstonia eutropha (also known as Cupriavidus necator), has long been a subject of metabolic engineering efforts to either enhance a product it naturally makes (polyhydroxyalkanoate) or produce novel bioproducts (e.g., biofuels and other small molecule compounds). Given the metabolic versatility of R. eutropha and the existence of multiple molecular genetic tools and techniques for the organism, development of a synthetic biology toolkit is underway. This toolkit will allow for novel, user-friendly design that can impart new capabilities to R. eutropha strains to be used for novel application. This article reviews the different synthetic biology techniques currently available for modifying and enhancing bioproduction in R. eutropha. KEY POINTS: • R. eutropha (C. necator) is a versatile organism that has been examined for many applications. • Synthetic biology is being used to design more powerful strains for bioproduction. • A diverse synthetic biology toolkit is being developed to enhance R. eutropha's capabilities.
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Affiliation(s)
- Lara Santolin
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
| | - Sebastian L Riedel
- Berliner Hochschule Für Technik, Department VIII - Mechanical Engineering, Event Technology and Process Engineering, Environmental and Bioprocess Engineering Laboratory, Berlin, Germany.
| | - Christopher J Brigham
- Department of Bioengineering, University of Massachusetts Dartmouth, North Dartmouth, MA, USA.
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5
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Santolin L, Eichenroth RSJ, Cornehl P, Wortmann H, Forbrig C, Schulze A, Haq IU, Brantl S, Rappsilber J, Riedel SL, Neubauer P, Gimpel M. Elucidating regulation of polyhydroxyalkanoate metabolism in Ralstonia eutropha: Identification of transcriptional regulators from phasin and depolymerase genes. J Biol Chem 2024; 300:107523. [PMID: 38969063 PMCID: PMC11332829 DOI: 10.1016/j.jbc.2024.107523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 05/24/2024] [Accepted: 06/20/2024] [Indexed: 07/07/2024] Open
Abstract
Despite the ever-growing research interest in polyhydroxyalkanoates (PHAs) as green plastic alternatives, our understanding of the regulatory mechanisms governing PHA synthesis, storage, and degradation in the model organism Ralstonia eutropha remains limited. Given its importance for central carbon metabolism, PHA homeostasis is probably controlled by a complex network of transcriptional regulators. Understanding this fine-tuning is the key for developing improved PHA production strains thereby boosting the application of PHAs. We conducted promoter pull-down assays with crude protein extracts from R. eutropha Re2058/pCB113, followed by liquid chromatography with tandem mass spectrometry, to identify putative transcriptional regulators involved in the expression control of PHA metabolism, specifically targeting phasin phaP1 and depolymerase phaZ3 and phaZ5 genes. The impact on promoter activity was studied in vivo using β-galactosidase assays and the most promising candidates were heterologously produced in Escherichia coli, and their interaction with the promoters investigated in vitro by electrophoretic mobility shift assays. We could show that R. eutropha DNA-binding xenobiotic response element-family-like protein H16_B1672, specifically binds the phaP1 promoter in vitro with a KD of 175 nM and represses gene expression from this promoter in vivo. Protein H16_B1672 also showed interaction with both depolymerase promoters in vivo and in vitro suggesting a broader role in the regulation of PHA metabolism. Furthermore, in vivo assays revealed that the H-NS-like DNA-binding protein H16_B0227 and the peptidyl-prolyl cis-trans isomerase PpiB, strongly repress gene expression from PphaP1 and PphaZ3, respectively. In summary, this study provides new insights into the regulation of PHA metabolism in R. eutropha, uncovering specific interactions of novel transcriptional regulators.
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Affiliation(s)
- Lara Santolin
- Technische Universität Berlin, Chair of Bioprocess Engineering, Berlin, Germany
| | | | - Paul Cornehl
- Technische Universität Berlin, Chair of Bioprocess Engineering, Berlin, Germany
| | - Henrike Wortmann
- Technische Universität Berlin, Chair of Bioprocess Engineering, Berlin, Germany
| | - Christian Forbrig
- Technische Universität Berlin, Chair of Bioanalytics, Berlin, Germany
| | - Anne Schulze
- Technische Universität Berlin, Chair of Bioanalytics, Berlin, Germany
| | - Inam Ul Haq
- Matthias-Schleiden-Institut für Genetik, Bioinformatik und Molekulare Botanik, AG Bakteriengenetik, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - Sabine Brantl
- Matthias-Schleiden-Institut für Genetik, Bioinformatik und Molekulare Botanik, AG Bakteriengenetik, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - Juri Rappsilber
- Technische Universität Berlin, Chair of Bioanalytics, Berlin, Germany
| | - Sebastian Lothar Riedel
- Technische Universität Berlin, Chair of Bioprocess Engineering, Berlin, Germany; Berliner Hochschule für Technik, Environmental and Bioprocess Engineering Laboratory, Berlin, Germany
| | - Peter Neubauer
- Technische Universität Berlin, Chair of Bioprocess Engineering, Berlin, Germany
| | - Matthias Gimpel
- Technische Universität Berlin, Chair of Bioprocess Engineering, Berlin, Germany.
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6
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Thiele I, Santolin L, Detels S, Osele R, Neubauer P, Riedel SL. High-cell-density fed-batch strategy to manufacture tailor-made P(HB-co-HHx) by engineered Ralstonia eutropha at laboratory scale and pilot scale. Microb Biotechnol 2024; 17:e14488. [PMID: 38850269 PMCID: PMC11162103 DOI: 10.1111/1751-7915.14488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 05/06/2024] [Accepted: 05/12/2024] [Indexed: 06/10/2024] Open
Abstract
The transition towards a sustainable bioeconomy requires the development of highly efficient bioprocesses that enable the production of bulk materials at a competitive price. This is particularly crucial for driving the commercialization of polyhydroxyalkanoates (PHAs) as biobased and biodegradable plastic substitutes. Among these, the copolymer poly(hydroxybutyrate-co-hydroxyhexanoate) (P(HB-co-HHx)) shows excellent material properties that can be tuned by regulating its monomer composition. In this study, we developed a high-cell-density fed-batch strategy using mixtures of fructose and canola oil to modulate the molar composition of P(HB-co-HHx) produced by Ralstonia eutropha Re2058/pCB113 at 1-L laboratory scale up to 150-L pilot scale. With cell densities >100 g L-1 containing 70-80 wt% of PHA with tunable HHx contents in the range of 9.0-14.6 mol% and productivities of up to 1.5 g L-1 h-1, we demonstrate the tailor-made production of P(HB-co-HHx) at an industrially relevant scale. Ultimately, this strategy enables the production of PHA bioplastics with defined material properties on the kilogram scale, which is often required for testing and adapting manufacturing processes to target diverse applications.
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Affiliation(s)
- Isabel Thiele
- Chair of Bioprocess Engineering, Institute of BiotechnologyTechnische Universität BerlinBerlinGermany
| | - Lara Santolin
- Chair of Bioprocess Engineering, Institute of BiotechnologyTechnische Universität BerlinBerlinGermany
| | - Svea Detels
- Chair of Bioprocess Engineering, Institute of BiotechnologyTechnische Universität BerlinBerlinGermany
| | - Riccardo Osele
- Chair of Bioprocess Engineering, Institute of BiotechnologyTechnische Universität BerlinBerlinGermany
- Department of BiotechnologyUniversity of VeronaVeronaItaly
| | - Peter Neubauer
- Chair of Bioprocess Engineering, Institute of BiotechnologyTechnische Universität BerlinBerlinGermany
| | - Sebastian L. Riedel
- Chair of Bioprocess Engineering, Institute of BiotechnologyTechnische Universität BerlinBerlinGermany
- Environmental and Bioprocess Engineering Laboratory, Department VIII – Mechanical Engineering, Event Technology and Process EngineeringBerliner Hochschule für TechnikBerlinGermany
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7
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Fukala I, Kučera I. Natural Polyhydroxyalkanoates-An Overview of Bacterial Production Methods. Molecules 2024; 29:2293. [PMID: 38792154 PMCID: PMC11124392 DOI: 10.3390/molecules29102293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 05/05/2024] [Accepted: 05/10/2024] [Indexed: 05/26/2024] Open
Abstract
Polyhydroxyalkanoates (PHAs) are intracellular biopolymers that microorganisms use for energy and carbon storage. They are mechanically similar to petrochemical plastics when chemically extracted, but are completely biodegradable. While they have potential as a replacement for petrochemical plastics, their high production cost using traditional carbon sources remains a significant challenge. One potential solution is to modify heterotrophic PHA-producing strains to utilize alternative carbon sources. An alternative approach is to utilize methylotrophic or autotrophic strains. This article provides an overview of bacterial strains employed for PHA production, with a particular focus on those exhibiting the highest PHA content in dry cell mass. The strains are organized according to their carbon source utilization, encompassing autotrophy (utilizing CO2, CO) and methylotrophy (utilizing reduced single-carbon substrates) to heterotrophy (utilizing more traditional and alternative substrates).
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Affiliation(s)
| | - Igor Kučera
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 267/2, CZ-61137 Brno, Czech Republic;
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Riedel SL, Donicz EN, Ferré-Aparicio P, Santolin L, Marbà-Ardébol AM, Neubauer P, Junne S. Workflow for shake flask and plate cultivations with fats for polyhydroxyalkanoate bioproduction. Appl Microbiol Biotechnol 2023:10.1007/s00253-023-12599-w. [PMID: 37266584 DOI: 10.1007/s00253-023-12599-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/08/2023] [Accepted: 05/11/2023] [Indexed: 06/03/2023]
Abstract
Since natural resources for the bioproduction of commodity chemicals are scarce, waste animal fats (WAF) are an interesting alternative biogenic residual feedstock. They appear as by-product from meat production, but several challenges are related to their application: first, the high melting points (up to 60 °C); and second, the insolubility in the polar water phase of cultivations. This leads to film and clump formation in shake flasks and microwell plates, which inhibits microbial consumption. In this study, different flask and well designs were investigated to identify the most suitable experimental set-up and further to create an appropriate workflow to achieve the required reproducibility of growth and product synthesis. The dissolved oxygen concentration was measured in-line throughout experiments. It became obvious that the gas mass transfer differed strongly among the shake flask design variants in cultivations with the polyhydroxyalkanoate (PHA) accumulating organism Ralstonia eutropha. A high reproducibility was achieved for certain flask or well plate design variants together with tailored cultivation conditions. Best results were achieved with bottom baffled glass and bottom baffled single-use shake flasks with flat membranes, namely, >6 g L-1 of cell dry weight (CDW) with >80 wt% polyhydroxybutyrate (PHB) from 1 wt% WAF. Improved pre-emulsification conditions for round microwell plates resulted in a production of 14 g L-1 CDW with a PHA content of 70 wt% PHB from 3 wt% WAF. The proposed workflow allows the rapid examination of fat material as feedstock, in the microwell plate and shake flask scale, also beyond PHA production. KEY POINTS: • Evaluation of shake flask designs for cultivating with hydrophobic raw materials • Development of a workflow for microwell plate cultivations with hydrophobic raw materials • Production of polyhydroxyalkanoate in small scale experiments from waste animal fat.
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Affiliation(s)
- Sebastian L Riedel
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
- Department VIII - Mechanical Engineering, Event Technology and Process Engineering, Laboratory of Environmental and Bioprocess Engineering, Berliner Hochschule für Technik, Seestr. 64, Berlin, D-13347, Germany
| | - Ewelina N Donicz
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Paula Ferré-Aparicio
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Lara Santolin
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Anna-Maria Marbà-Ardébol
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Peter Neubauer
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Stefan Junne
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany.
- Department of Chemistry and Bioscience, Aalborg University Esbjerg, Niels Bohrs Vej 8, DK-6700, Esbjerg, Denmark.
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9
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Santolin L, Thiele I, Neubauer P, Riedel SL. Tailoring the HHx monomer content of P(HB- co-HHx) by flexible substrate compositions: scale-up from deep-well-plates to laboratory bioreactor cultivations. Front Bioeng Biotechnol 2023; 11:1081072. [PMID: 37214303 PMCID: PMC10193151 DOI: 10.3389/fbioe.2023.1081072] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 04/18/2023] [Indexed: 05/24/2023] Open
Abstract
The enhanced material properties exhibited by the microbially synthetized polyhydroxyalkanoate (PHA) copolymer poly(hydroxybutyrate-co-hydroxyhexanoate) [P(HB-co-HHx)] evidence that this naturally biodegrading biopolymer could replace various functionalities of established petrochemical plastics. In fact, the thermal processability, toughness and degradation rate of P(HB-co-HHx) can be tuned by modulating its HHx molar content enabling to manufacture polymers à-la-carte. We have developed a simple batch strategy to precisely control the HHx content of P(HB-co-HHx) to obtain tailor-made PHAs with defined properties. By adjusting the ratio of fructose to canola oil as substrates for the cultivation of recombinant Ralstonia eutropha Re2058/pCB113, the molar fraction of HHx in P(HB-co-HHx) could be adjusted within a range of 2-17 mol% without compromising polymer yields. The chosen strategy proved to be robust from the mL-scale in deep-well-plates to 1-L batch bioreactor cultivations.
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Affiliation(s)
- Lara Santolin
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
| | - Isabel Thiele
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
| | - Peter Neubauer
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
| | - Sebastian L. Riedel
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
- Berliner Hochschule für Technik, Department VIII – Mechanical Engineering, Event Technology and Process Engineering, Laboratory of Environmental and Bioprocess Engineering, Berlin, Germany
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10
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Gutschmann B, Huang B, Santolin L, Thiele I, Neubauer P, Riedel SL. Native feedstock options for the polyhydroxyalkanoate industry in Europe: A review. Microbiol Res 2022; 264:127177. [DOI: 10.1016/j.micres.2022.127177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/05/2022] [Accepted: 08/24/2022] [Indexed: 11/26/2022]
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Gutschmann B, Högl TH, Huang B, Maldonado Simões M, Junne S, Neubauer P, Grimm T, Riedel SL. Polyhydroxyalkanoate production from animal by-products: Development of a pneumatic feeding system for solid fat/protein-emulsions. Microb Biotechnol 2022; 16:286-294. [PMID: 36168730 PMCID: PMC9871516 DOI: 10.1111/1751-7915.14150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 09/02/2022] [Accepted: 09/10/2022] [Indexed: 01/27/2023] Open
Abstract
Fat-containing animal by-product streams are locally available in large quantities. Depending on their quality, they can be inexpensive substrates for biotechnological processes. To accelerate industrial polyhydroxyalkanoate (PHA) bioplastic production, the development of efficient bioprocesses that are based on animal by-product streams is a promising approach to reduce overall production costs. However, the solid nature of animal by-product streams requires a tailor-made process development. In this study, a fat/protein-emulsion (FPE), which is a by-product stream from industrial-scale pharmaceutical heparin production and of which several hundred tons are available annually, was evaluated for PHA production with Ralstonia eutropha. The FPE was used as the sole source of carbon and nitrogen in shake flask and bioreactor cultivations. A tailored pneumatic feeding system was built for laboratory bioreactors to facilitate fed-batch cultivations with the solid FPE. The process yielded up to 51 g L-1 cell dry weight containing 71 wt% PHA with a space-time yield of 0.6 gPHA L-1 h-1 without using any carbon or nitrogen sources other than FPE. The presented approach highlights the potential of animal by-product stream valorization into PHA and contributes to a transition towards a circular bioeconomy.
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Affiliation(s)
- Björn Gutschmann
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | - Thomas H. Högl
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | - Boyang Huang
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | | | - Stefan Junne
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | - Peter Neubauer
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
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12
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Optimization of Growth Conditions to Enhance PHA Production by Cupriavidus necator. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8090451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The accumulation of polyhydroxyalkanoates (PHAs) by microorganisms usually occurs in response to environmental stress conditions. Therefore, it is advantageous to choose two-step cultivation. The first phase is aimed at maximizing biomass production, and only in the second phase, after setting the suitable conditions, PHA production starts. The aim of this work was to optimize the composition of the minimal propagation medium used for biomass production of Cupriavidus necator DSM 545 using the response surface methodology (RSM). Based on the results from the search for optimization limits, the glucose concentration, the ammonium sulfate concentration and the phosphate buffer molarity were chosen as independent variables. The optimal values were found as follows: the glucose concentration 10.8 g/L; the ammonium sulfate concentration 0.95 g/L; and the phosphate buffer molarity 60.2 mmol/L. The predicted biomass concentration was 4.54 g/L, and the verified value was at 4.84 g/L. Although this work was primarily focused on determining the optimal composition of the propagation medium, we also evaluated the optimal composition of the production medium and found that the optimal glucose concentration was 6.7 g/L; the ammonium sulfate concentration 0.60 g/L; and the phosphate buffer molarity 20 mmol/L. The predicted PHB yield was 54.7% (w/w) of dry biomass, and the verified value was 49.1%.
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13
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Gutschmann B, Maldonado Simões M, Schiewe T, Schröter ES, Münzberg M, Neubauer P, Bockisch A, Riedel SL. Continuous feeding strategy for polyhydroxyalkanoate production from solid waste animal fat at laboratory- and pilot-scale. Microb Biotechnol 2022; 16:295-306. [PMID: 35921398 PMCID: PMC9871520 DOI: 10.1111/1751-7915.14104] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 06/03/2022] [Accepted: 06/05/2022] [Indexed: 01/27/2023] Open
Abstract
Bioconversion of waste animal fat (WAF) to polyhydroxyalkanoates (PHAs) is an approach to lower the production costs of these plastic alternatives. However, the solid nature of WAF requires a tailor-made process development. In this study, a double-jacket feeding system was built to thermally liquefy the WAF to employ a continuous feeding strategy. During laboratory-scale cultivations with Ralstonia eutropha Re2058/pCB113, 70% more PHA (45 gPHA L-1 ) and a 75% higher space-time yield (0.63 gPHA L-1 h-1 ) were achieved compared to previously reported fermentations with solid WAF. During the development process, growth and PHA formation were monitored in real-time by in-line photon density wave spectroscopy. The process robustness was further evaluated during scale-down fermentations employing an oscillating aeration, which did not alter the PHA yield although cells encountered periods of oxygen limitation. Flow cytometry with propidium iodide staining showed that more than two-thirds of the cells were viable at the end of the cultivation and viability was even little higher in the scale-down cultivations. Application of this feeding system at 150-L pilot-scale cultivation yielded in 31.5 gPHA L-1 , which is a promising result for the further scale-up to industrial scale.
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Affiliation(s)
- Björn Gutschmann
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany
| | | | | | - Edith S. Schröter
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany
| | | | - Peter Neubauer
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany
| | - Anika Bockisch
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany,Bio‐PAT e.VBerlinGermany
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14
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From Organic Wastes and Hydrocarbons Pollutants to Polyhydroxyalkanoates: Bioconversion by Terrestrial and Marine Bacteria. SUSTAINABILITY 2022. [DOI: 10.3390/su14148241] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The use of fossil-based plastics has become unsustainable because of the polluting production processes, difficulties for waste management sectors, and high environmental impact. Polyhydroxyalkanoates (PHA) are bio-based biodegradable polymers derived from renewable resources and synthesized by bacteria as intracellular energy and carbon storage materials under nutrients or oxygen limitation and through the optimization of cultivation conditions with both pure and mixed culture systems. The PHA properties are affected by the same principles of oil-derived polyolefins, with a broad range of compositions, due to the incorporation of different monomers into the polymer matrix. As a consequence, the properties of such materials are represented by a broad range depending on tunable PHA composition. Producing waste-derived PHA is technically feasible with mixed microbial cultures (MMC), since no sterilization is required; this technology may represent a solution for waste treatment and valorization, and it has recently been developed at the pilot scale level with different process configurations where aerobic microorganisms are usually subjected to a dynamic feeding regime for their selection and to a high organic load for the intracellular accumulation of PHA. In this review, we report on studies on terrestrial and marine bacteria PHA-producers. The available knowledge on PHA production from the use of different kinds of organic wastes, and otherwise, petroleum-polluted natural matrices coupling bioremediation treatment has been explored. The advancements in these areas have been significant; they generally concern the terrestrial environment, where pilot and industrial processes are already established. Recently, marine bacteria have also offered interesting perspectives due to their advantageous effects on production practices, which they can relieve several constraints. Studies on the use of hydrocarbons as carbon sources offer evidence for the feasibility of the bioconversion of fossil-derived plastics into bioplastics.
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15
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Sohn YJ, Son J, Jo SY, Park SY, Yoo JI, Baritugo KA, Na JG, Choi JI, Kim HT, Joo JC, Park SJ. Chemoautotroph Cupriavidus necator as a potential game-changer for global warming and plastic waste problem: A review. BIORESOURCE TECHNOLOGY 2021; 340:125693. [PMID: 34365298 DOI: 10.1016/j.biortech.2021.125693] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
Cupriavidus necator, a versatile microorganism found in both soil and water, can have both heterotrophic and lithoautotrophic metabolisms depending on environmental conditions. C. necator has been extensively examined for producing Polyhydroxyalkanoates (PHAs), the promising polyester alternatives to petroleum-based synthetic polymers because it has a superior ability for accumulating a considerable amount of PHAs from renewable resources. The development of metabolically engineered C. necator strains has led to their application for synthesizing biopolymers, biofuels and biochemicals such as ethanol, isobutanol and higher alcohols. Bio-based processes of recombinant C. necator have made much progress in production of these high-value products from biomass wastes, plastic wastes and even waste gases. In this review, we discuss the potential of C. necator as promising platform host strains that provide a great opportunity for developing a waste-based circular bioeconomy.
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Affiliation(s)
- Yu Jung Sohn
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Jina Son
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Seo Young Jo
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Se Young Park
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Jee In Yoo
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Kei-Anne Baritugo
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Jeong Geol Na
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Republic of Korea.
| | - Jong-Il Choi
- Department of Biotechnology and Bioengineering, Chonnam National University, Gwangju 61186, Korea.
| | - Hee Taek Kim
- Department of Food Science and Technology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 34134, Republic of Korea.
| | - Jeong Chan Joo
- Department of Biotechnology, The Catholic University of Korea, Gyeonggi-do, Republic of Korea.
| | - Si Jae Park
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea.
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