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Santoyo‐Garcia JH, Walls LE, Valdivia‐Cabrera M, Malcı K, Jonguitud‐Borrego N, Halliday KJ, Rios‐Solis L. The synergetic effect from the combination of different adsorption resins in batch and semi-continuous cultivations of S. Cerevisiae cell factories to produce acetylated Taxanes precursors of the anticancer drug Taxol. Biotechnol Bioeng 2023; 120:2160-2174. [PMID: 37428616 PMCID: PMC10952759 DOI: 10.1002/bit.28487] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 06/17/2023] [Accepted: 06/22/2023] [Indexed: 07/12/2023]
Abstract
In situ product recovery is an efficient way to intensify bioprocesses as it can perform adsorption of the desired natural products in the cultivation. However, it is common to use only one adsorbent (liquid or solid) to perform the product recovery. For this study, the use of an in situ product recovery method with three combined commercial resins (HP-20, XAD7HP, and HP-2MG) with different chemical properties was performed. A new yeast strain of Saccharomyces cerevisiae was engineered using CRISPR Cas9 (strain EJ2) to deliver heterologous expression of oxygenated acetylated taxanes that are precursors of the anticancer drug Taxol ® (paclitaxel). Microscale cultivations using a definitive screening design (DSD) were set to get the best resin combinations and concentrations to retrieve high taxane titers. Once the best resin treatment was selected by the DSD, semi-continuous cultivation in high throughput microscale was performed to increase the total taxanes yield up to 783 ± 33 mg/L. The best T5α-yl Acetate yield obtained was up to 95 ± 4 mg/L, the highest titer of this compound ever reported by a heterologous expression. It was also observed that by using a combination of the resins in the cultivation, 8 additional uncharacterized taxanes were found in the gas chromatograms compared to the dodecane overlay method. Lastly, the cell-waste reactive oxygen species concentrations from the yeast were 1.5-fold lower in the resin's treatment compared to the control with no adsorbent aid. The possible future implications of this method could be critical for bioprocess intensification, allowing the transition to a semi-continuous flow bioprocess. Further, this new methodology broadens the use of different organisms for natural product synthesis/discovery benefiting from clear bioprocess intensification advantages.
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Affiliation(s)
- Jorge H. Santoyo‐Garcia
- Institute for BioengineeringUniversity of EdinburghEdinburghUK
- Centre for Engineering BiologyUniversity of EdinburghEdinburghUK
| | - Laura E. Walls
- Institute for BioengineeringUniversity of EdinburghEdinburghUK
- Centre for Engineering BiologyUniversity of EdinburghEdinburghUK
| | - Marissa Valdivia‐Cabrera
- Institute of Molecular Plant SciencesSchool of Biological Sciences, University of EdinburghEdinburgh
| | - Koray Malcı
- Institute for BioengineeringUniversity of EdinburghEdinburghUK
- Centre for Engineering BiologyUniversity of EdinburghEdinburghUK
- Present address:
Koray MalcıDepartment of Bioengineering, Imperial College LondonLondonUK
| | - Nestor Jonguitud‐Borrego
- Institute for BioengineeringUniversity of EdinburghEdinburghUK
- Centre for Engineering BiologyUniversity of EdinburghEdinburghUK
| | - Karen J. Halliday
- Institute of Molecular Plant SciencesSchool of Biological Sciences, University of EdinburghEdinburgh
| | - Leonardo Rios‐Solis
- Institute for BioengineeringUniversity of EdinburghEdinburghUK
- Centre for Engineering BiologyUniversity of EdinburghEdinburghUK
- Division of Molecular Biology and BiotechnologySchool of Natural and Environmental Sciences, Newcastle UniversityNewcastle upon TyneUK
- Department of Biochemical Engineering, The Advanced Centre for Biochemical EngineeringUniversity College LondonLondonUnited Kingdom
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2
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Walls LE, Otoupal P, Ledesma-Amaro R, Velasquez-Orta SB, Gladden JM, Rios-Solis L. Bioconversion of cellulose into bisabolene using Ruminococcus flavefaciens and Rhodosporidium toruloides. Bioresour Technol 2023; 368:128216. [PMID: 36347482 DOI: 10.1016/j.biortech.2022.128216] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/24/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
In this study, organic acids were demonstrated as a promising carbon source for bisabolene production by the non-conventional yeast, Rhodosporidium toruloides, at microscale with a maximum titre of 1055 ± 7 mg/L. A 125-fold scale-up of the optimal process, enhanced bisabolene titres 2.5-fold to 2606 mg/L. Implementation of a pH controlled organic acid feeding strategy at this scale lead to a further threefold improvement in bisabolene titre to 7758 mg/L, the highest reported microbial titre. Finally, a proof-of-concept sequential bioreactor approach was investigated. Firstly, the cellulolytic bacterium Ruminococcus flavefaciens was employed to ferment cellulose, yielding 4.2 g/L of organic acids. R. toruloides was subsequently cultivated in the resulting supernatant, producing 318 ± 22 mg/L of bisabolene. This highlights the feasibility of a sequential bioprocess for the bioconversion of cellulose, into biojet fuel candidates. Future work will focus on enhancing organic acid yields and the use of real lignocellulosic feedstocks to further enhance bisabolene production.
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Affiliation(s)
- Laura E Walls
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh EH9 3BF, UK; Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh EH9 3BF, UK
| | - Peter Otoupal
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA 94608, USA; Agile BioFoundry, Department of Energy, Emeryville, CA 94608, USA; Biomaterials and Biomanufacturing Department, Sandia National Laboratories, Livermore, CA 94551, USA
| | - Rodrigo Ledesma-Amaro
- Department of Bioengineering and Imperial College Centre for Synthetic Biology, Imperial College London, London SW7 2AZ, UK
| | | | - John M Gladden
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA 94608, USA; Agile BioFoundry, Department of Energy, Emeryville, CA 94608, USA; Biomaterials and Biomanufacturing Department, Sandia National Laboratories, Livermore, CA 94551, USA
| | - Leonardo Rios-Solis
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh EH9 3BF, UK; Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh EH9 3BF, UK; School of Natural and Environmental Sciences, Molecular Biology and Biotechnology Division, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK.
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3
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Santoyo-Garcia JH, Walls LE, Nowrouzi B, Galindo-Rodriguez GR, Ochoa-Villarreal M, Loake GJ, Dimartino S, Rios-Solis L. In situ solid-liquid extraction enhances recovery of taxadiene from engineered Saccharomyces cerevisiae cell factories. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Abstract
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Simple
and effective molecular diagnostic methods have gained importance
due to the devastating effects of the COVID-19 pandemic. Various isothermal
one-pot COVID-19 detection methods have been proposed as favorable
alternatives to standard RT-qPCR methods as they do not require sophisticated
and/or expensive devices. However, as one-pot reactions are highly
complex with a large number of variables, determining the optimum
conditions to maximize sensitivity while minimizing diagnostic cost
can be cumbersome. Here, statistical design of experiments (DoE) was
employed to accelerate the development and optimization of a CRISPR/Cas12a-RPA-based
one-pot detection method for the first time. Using a definitive screening
design, factors with a significant effect on performance were elucidated
and optimized, facilitating the detection of two copies/μL of
full-length SARS-CoV-2 (COVID-19) genome using simple instrumentation.
The screening revealed that the addition of a reverse transcription
buffer and an RNase inhibitor, components generally omitted in one-pot
reactions, improved performance significantly, and optimization of
reverse transcription had a critical impact on the method’s
sensitivity. This strategic method was also applied in a second approach
involving a DNA sequence of the N gene from the COVID-19 genome. The
slight differences in optimal conditions for the methods using RNA
and DNA templates highlight the importance of reaction-specific optimization
in ensuring robust and efficient diagnostic performance. The proposed
detection method is automation-compatible, rendering it suitable for
high-throughput testing. This study demonstrated the benefits of DoE
for the optimization of complex one-pot molecular diagnostics methods
to increase detection sensitivity.
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Affiliation(s)
- Koray Malcı
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Kings Buildings, Edinburgh EH9 3BF, United Kingdom
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Kings Buildings, Edinburgh EH9 3BD, United Kingdom
| | - Laura E. Walls
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Kings Buildings, Edinburgh EH9 3BF, United Kingdom
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Kings Buildings, Edinburgh EH9 3BD, United Kingdom
| | - Leonardo Rios-Solis
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Kings Buildings, Edinburgh EH9 3BF, United Kingdom
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Kings Buildings, Edinburgh EH9 3BD, United Kingdom
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
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5
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Teworte S, Malcı K, Walls LE, Halim M, Rios-Solis L. Recent advances in fed-batch microscale bioreactor design. Biotechnol Adv 2021; 55:107888. [PMID: 34923075 DOI: 10.1016/j.biotechadv.2021.107888] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 08/31/2021] [Revised: 11/25/2021] [Accepted: 12/11/2021] [Indexed: 12/17/2022]
Abstract
Advanced fed-batch microbioreactors mitigate scale up risks and more closely mimic industrial cultivation practices. Recently, high throughput microscale feeding strategies have been developed which improve the accessibility of microscale fed-batch cultivation irrespective of experimental budget. This review explores such technologies and their role in accelerating bioprocess development. Diffusion- and enzyme-controlled feeding achieve a continuous supply of substrate while being simple and affordable. More complex feed profiles and greater process control require additional hardware. Automated liquid handling robots may be programmed to predefined feed profiles and have the sensitivity to respond to deviations in process parameters. Microfluidic technologies have been shown to facilitate both continuous and precise feeding. Holistic approaches, which integrate automated high-throughput fed-batch cultivation with strategic design of experiments and model-based optimisation, dramatically enhance process understanding whilst minimising experimental burden. The incorporation of real-time data for online optimisation of feed conditions can further refine screening. Although the technologies discussed in this review hold promise for efficient, low-risk bioprocess development, the expense and complexity of automated cultivation platforms limit their widespread application. Future attention should be directed towards the development of open-source software and reducing the exclusivity of hardware.
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Affiliation(s)
- Sarah Teworte
- Institute for Bioengineering, School of Engineering, University of Edinburgh, The King's Buildings, Edinburgh EH9 3DW, Scotland, United Kingdom
| | - Koray Malcı
- Institute for Bioengineering, School of Engineering, University of Edinburgh, The King's Buildings, Edinburgh EH9 3DW, Scotland, United Kingdom; Centre for Synthetic and Systems Biology, University of Edinburgh, The King's Buildings, Edinburgh EH9 3DW, Scotland, United Kingdom
| | - Laura E Walls
- Institute for Bioengineering, School of Engineering, University of Edinburgh, The King's Buildings, Edinburgh EH9 3DW, Scotland, United Kingdom; Centre for Synthetic and Systems Biology, University of Edinburgh, The King's Buildings, Edinburgh EH9 3DW, Scotland, United Kingdom
| | - Murni Halim
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - Leonardo Rios-Solis
- Institute for Bioengineering, School of Engineering, University of Edinburgh, The King's Buildings, Edinburgh EH9 3DW, Scotland, United Kingdom; Centre for Synthetic and Systems Biology, University of Edinburgh, The King's Buildings, Edinburgh EH9 3DW, Scotland, United Kingdom.
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6
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Walls LE, Martinez JL, Del Rio Chanona EA, Rios-Solis L. Definitive screening accelerates Taxol biosynthetic pathway optimization and scale up in Saccharomyces cerevisiae cell factories. Biotechnol J 2021; 17:e2100414. [PMID: 34649302 DOI: 10.1002/biot.202100414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 08/04/2021] [Revised: 10/08/2021] [Accepted: 10/11/2021] [Indexed: 12/22/2022]
Abstract
BACKGROUND Recent technological advancements in synthetic and systems biology have enabled the construction of microbial cell factories expressing diverse heterologous pathways in unprecedentedly short time scales. However, the translation of such laboratory scale breakthroughs to industrial bioprocesses remains a major bottleneck. METHODS AND MAJOR RESULTS In this study, an accelerated bioprocess development approach was employed to optimize the biosynthetic pathway of the blockbuster chemotherapy drug, Taxol. Statistical design of experiments approaches were coupled with an industrially relevant high-throughput microbioreactor system to optimize production of key Taxol intermediates, Taxadien-5α-ol and Taxadien-5α-yl-acetate, in engineered yeast cell factories. The optimal factor combination was determined via data driven statistical modelling and validated in 1 L bioreactors leading to a 2.1-fold improvement in taxane production compared to a typical defined media. Elucidation and mitigation of nutrient limitation enhanced product titers a further two-fold and titers of the critical Taxol precursors, Taxadien-5α-ol and Taxadien-5α-yl-acetate were improved to 34 and 11 mg L-1 , representing a three-fold improvement compared to the highest literature titers in S. cerevisiae. Comparable titers were obtained when the process was scaled up a further five-fold using 5 L bioreactors. CONCLUSIONS The results of this study highlight the benefits of a holistic design of experiments guided approach to expedite early stage bioprocess development.
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Affiliation(s)
- Laura E Walls
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh, UK.,Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK.,Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens Lyngby, Denmark
| | - José L Martinez
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens Lyngby, Denmark
| | - E Antonio Del Rio Chanona
- Sargent Centre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, UK
| | - Leonardo Rios-Solis
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh, UK.,Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK
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7
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Walls LE, Malcı K, Nowrouzi B, Li RA, d'Espaux L, Wong J, Dennis JA, Semião AJC, Wallace S, Martinez JL, Keasling JD, Rios-Solis L. Optimizing the biosynthesis of oxygenated and acetylated Taxol precursors in Saccharomyces cerevisiae using advanced bioprocessing strategies. Biotechnol Bioeng 2021; 118:279-293. [PMID: 32936453 DOI: 10.1002/bit.27569] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/27/2020] [Accepted: 09/12/2020] [Indexed: 11/09/2022]
Abstract
Taxadien-5α-hydroxylase and taxadien-5α-ol O-acetyltransferase catalyze the oxidation of taxadiene to taxadien-5α-ol and subsequent acetylation to taxadien-5α-yl-acetate in the biosynthesis of the blockbuster anticancer drug, paclitaxel (Taxol®). Despite decades of research, the promiscuous and multispecific CYP725A4 enzyme remains a major bottleneck in microbial biosynthetic pathway development. In this study, an interdisciplinary approach was applied for the construction and optimization of the early pathway in Saccharomyces cerevisiae, across a range of bioreactor scales. High-throughput microscale optimization enhanced total oxygenated taxane titer to 39.0 ± 5.7 mg/L and total taxane product titers were comparable at micro and minibioreactor scale at 95.4 ± 18.0 and 98.9 mg/L, respectively. The introduction of pH control successfully mitigated a reduction of oxygenated taxane production, enhancing the potential taxadien-5α-ol isomer titer to 19.2 mg/L, comparable with the 23.8 ± 3.7 mg/L achieved at microscale. A combination of bioprocess optimization and increased gas chromatography-mass spectrometry resolution at 1 L bioreactor scale facilitated taxadien-5α-yl-acetate detection with a final titer of 3.7 mg/L. Total oxygenated taxane titers were improved 2.7-fold at this scale to 78 mg/L, the highest reported titer in yeast. Critical parameters affecting the productivity of the engineered strain were identified across a range of scales, providing a foundation for the development of robust integrated bioprocess control systems.
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Affiliation(s)
- Laura E Walls
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh, UK
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Koray Malcı
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh, UK
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK
| | - Behnaz Nowrouzi
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh, UK
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK
| | - Rachel A Li
- DOE Joint BioEnergy Institute, Emeryville, California, USA
- Division of Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Leo d'Espaux
- DOE Joint BioEnergy Institute, Emeryville, California, USA
- Division of Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Jeff Wong
- DOE Joint BioEnergy Institute, Emeryville, California, USA
- Division of Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Jonathan A Dennis
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK
- Institute of Quantitative Biology, Biochemistry, and Biotechnology, School of Biological Sciences, University of Edinburgh, Edinburgh, UK
| | - Andrea J C Semião
- Institute for Infrastructure and Environment, School of Engineering, University of Edinburgh, Edinburgh, UK
| | - Stephen Wallace
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK
- Institute of Quantitative Biology, Biochemistry, and Biotechnology, School of Biological Sciences, University of Edinburgh, Edinburgh, UK
| | - José L Martinez
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Jay D Keasling
- DOE Joint BioEnergy Institute, Emeryville, California, USA
- Division of Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, California, USA
- Center for Biosustainability, Danish Technical University, Lyngby, Denmark
- Center for Synthetic Biochemistry, Institute for Synthetic Biology, Shenzhen Institutes for Advanced Technologies, Shenzhen, China
- Departments of Chemical and Biomolecular Engineering and of Bioengineering, University of California, Berkeley, Berkeley, California, USA
| | - Leonardo Rios-Solis
- Institute for Bioengineering, School of Engineering, University of Edinburgh, Edinburgh, UK
- Centre for Synthetic and Systems Biology (SynthSys), University of Edinburgh, Edinburgh, UK
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8
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Malcı K, Walls LE, Rios-Solis L. Multiplex Genome Engineering Methods for Yeast Cell Factory Development. Front Bioeng Biotechnol 2020; 8:589468. [PMID: 33195154 PMCID: PMC7658401 DOI: 10.3389/fbioe.2020.589468] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 07/30/2020] [Accepted: 10/07/2020] [Indexed: 12/12/2022] Open
Abstract
As biotechnological applications of synthetic biology tools including multiplex genome engineering are expanding rapidly, the construction of strategically designed yeast cell factories becomes increasingly possible. This is largely due to recent advancements in genome editing methods like CRISPR/Cas tech and high-throughput omics tools. The model organism, baker's yeast (Saccharomyces cerevisiae) is an important synthetic biology chassis for high-value metabolite production. Multiplex genome engineering approaches can expedite the construction and fine tuning of effective heterologous pathways in yeast cell factories. Numerous multiplex genome editing techniques have emerged to capitalize on this recently. This review focuses on recent advancements in such tools, such as delta integration and rDNA cluster integration coupled with CRISPR-Cas tools to greatly enhance multi-integration efficiency. Examples of pre-placed gate systems which are an innovative alternative approach for multi-copy gene integration were also reviewed. In addition to multiple integration studies, multiplexing of alternative genome editing methods are also discussed. Finally, multiplex genome editing studies involving non-conventional yeasts and the importance of automation for efficient cell factory design and construction are considered. Coupling the CRISPR/Cas system with traditional yeast multiplex genome integration or donor DNA delivery methods expedites strain development through increased efficiency and accuracy. Novel approaches such as pre-placing synthetic sequences in the genome along with improved bioinformatics tools and automation technologies have the potential to further streamline the strain development process. In addition, the techniques discussed to engineer S. cerevisiae, can be adapted for use in other industrially important yeast species for cell factory development.
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Affiliation(s)
- Koray Malcı
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, United Kingdom
| | - Laura E Walls
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, United Kingdom
| | - Leonardo Rios-Solis
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, United Kingdom
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9
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Nowrouzi B, Li RA, Walls LE, d'Espaux L, Malcı K, Liang L, Jonguitud-Borrego N, Lerma-Escalera AI, Morones-Ramirez JR, Keasling JD, Rios-Solis L. Enhanced production of taxadiene in Saccharomyces cerevisiae. Microb Cell Fact 2020; 19:200. [PMID: 33138820 PMCID: PMC7607689 DOI: 10.1186/s12934-020-01458-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [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: 06/19/2020] [Accepted: 10/17/2020] [Indexed: 12/30/2022] Open
Abstract
Background Cost-effective production of the highly effective anti-cancer drug, paclitaxel (Taxol®), remains limited despite growing global demands. Low yields of the critical taxadiene precursor remains a key bottleneck in microbial production. In this study, the key challenge of poor taxadiene synthase (TASY) solubility in S. cerevisiae was revealed, and the strains were strategically engineered to relieve this bottleneck. Results Multi-copy chromosomal integration of TASY harbouring a selection of fusion solubility tags improved taxadiene titres 22-fold, up to 57 ± 3 mg/L at 30 °C at microscale, compared to expressing a single episomal copy of TASY. The scalability of the process was highlighted through achieving similar titres during scale up to 25 mL and 250 mL in shake flask and bioreactor cultivations, respectively at 20 and 30 °C. Maximum taxadiene titres of 129 ± 15 mg/L and 127 mg/L were achieved through shake flask and bioreactor cultivations, respectively, of the optimal strain at a reduced temperature of 20 °C. Conclusions The results of this study highlight the benefit of employing a combination of molecular biology and bioprocess tools during synthetic pathway development, with which TASY activity was successfully improved by 6.5-fold compared to the highest literature titre in S. cerevisiae cell factories.
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Affiliation(s)
- Behnaz Nowrouzi
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, EH9 3BF, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, EH9 3BD, United Kingdom
| | - Rachel A Li
- DOE Joint BioEnergy Institute, Emeryville, CA, 94608, USA.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Laura E Walls
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, EH9 3BF, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, EH9 3BD, United Kingdom
| | - Leo d'Espaux
- DOE Joint BioEnergy Institute, Emeryville, CA, 94608, USA.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Koray Malcı
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, EH9 3BF, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, EH9 3BD, United Kingdom
| | - Lungang Liang
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, EH9 3BF, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, EH9 3BD, United Kingdom
| | - Nestor Jonguitud-Borrego
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, EH9 3BF, United Kingdom.,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, EH9 3BD, United Kingdom
| | - Albert I Lerma-Escalera
- Centro de Investigación en Biotecnología y Nanotecnología, Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Apodaca, Mexico
| | - Jose R Morones-Ramirez
- Centro de Investigación en Biotecnología y Nanotecnología, Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Apodaca, Mexico
| | - Jay D Keasling
- DOE Joint BioEnergy Institute, Emeryville, CA, 94608, USA.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.,Departments of Chemical & Biomolecular Engineering and of Bioengineering, University of California, Berkeley, Berkeley, CA, 94720, USA.,Center for Biosustainability, Danish Technical University, Lyngby, Denmark.,Center for Synthetic Biochemistry, Institute for Synthetic Biology, Shenzhen Institutes for Advanced Technologies, Shenzhen, China
| | - Leonardo Rios-Solis
- Institute for Bioengineering, School of Engineering, The University of Edinburgh, Edinburgh, EH9 3BF, United Kingdom. .,Centre for Synthetic and Systems Biology (SynthSys), The University of Edinburgh, Edinburgh, EH9 3BD, United Kingdom.
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