1
|
Immobilization of Actinobacillus succinogenes on nano- and micro-fiber membranes for efficient and robust production of succinic acid. Bioprocess Biosyst Eng 2023; 46:611-620. [PMID: 36735093 DOI: 10.1007/s00449-023-02848-7] [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: 05/17/2022] [Accepted: 01/13/2023] [Indexed: 02/04/2023]
Abstract
This work aimed to study the efficiency of nano- and micro- fiber membranes in immobilizing Actinobacillus succinogenes CCTCC M2012036 for succinic acid production. Among the four kinds of electrospun nanofiber membranes of cellulose acetate, chitosan, poly(vinyl alcohol) (PVA) and chitosan-PVA, the cellulose acetate nanofiber membrane-immobilized cells performed the best with a succinic acid concentration and yield to be 27.3 ± 3.5 g/L and 70.9 ± 5.8%. The cell-immobilized viscose microfiber membrane presented good reuse stability, and 17 batches of fermentation without activity loss were realized with the highest succinic acid yield of 83.20%. A microfiber membrane bioreactor was further constructed with the cell-immobilized viscose microfiber membrane to perform fermentation on a larger scale, and the concentration, yield and productivity of succinic acid were 73.20 g/L, 86.50% and 1.49 g/(L⋅h) using a fed-batch strategy, which were 124.30%, 127.60% and 124.2% of those obtained in the traditional fermenter. This study provided an approach for improving the practicality of biological succinic acid production.
Collapse
|
2
|
Son J, Sohn YJ, Baritugo KA, Jo SY, Song HM, Park SJ. Recent advances in microbial production of diamines, aminocarboxylic acids, and diacids as potential platform chemicals and bio-based polyamides monomers. Biotechnol Adv 2023; 62:108070. [PMID: 36462631 DOI: 10.1016/j.biotechadv.2022.108070] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/16/2022] [Accepted: 11/24/2022] [Indexed: 12/03/2022]
Abstract
Recently, bio-based manufacturing processes of value-added platform chemicals and polymers in biorefineries using renewable resources have extensively been developed for sustainable and carbon dioxide (CO2) neutral-based industry. Among them, bio-based diamines, aminocarboxylic acids, and diacids have been used as monomers for the synthesis of polyamides having different carbon numbers and ubiquitous and versatile industrial polymers and also as precursors for further chemical and biological processes to afford valuable chemicals. Until now, these platform bio-chemicals have successfully been produced by biorefinery processes employing enzymes and/or microbial host strains as main catalysts. In this review, we discuss recent advances in bio-based production of diamines, aminocarboxylic acids, and diacids, which has been developed and improved by systems metabolic engineering strategies of microbial consortia and optimization of microbial conversion processes including whole cell bioconversion and direct fermentative production.
Collapse
Affiliation(s)
- Jina Son
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Yu Jung Sohn
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, 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, 52 Ewhayeodae-gil, Seodaemun-gu, 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, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Hye Min Song
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Si Jae Park
- Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea.
| |
Collapse
|
3
|
Genome Shuffling Mutant of Streptomyces diastatochromogenes for Substantial Improvement of Toyocamycin Production. FERMENTATION 2022. [DOI: 10.3390/fermentation8100535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Toyocamycin, a nucleoside antibiotic, is a fungicide with the potential to control plant pathogens. In this study, three rounds of genome shuffling screening were applied to enhance the toyocamycin production in Streptomyces diastatochromogenes 1628. After three rounds of genome-shuffling screening, the toyocamycin production increased by 10.8-fold that of wild-type, and 2.64-fold of its parental strain. By optimization of its nutrition condition in medium, the highest production of toyocamycin reached 1173.6 mg/L in TY-producing medium. In addition, the mechanism for the improvement of shuffled strains was investigated. Recombinants with increased toyocamycin production exhibited higher transcriptional level of the toy cluster and product resistance. Furthermore, the rise of ATP hydrolysis rate indicated that intracellular ATP exhibit a significant role in tuning the toy cluster by an ATP-binding pathway-specific regulator. In all, we obtained S. diastatochromogenes mutants with enhanced toyocamycin production, and provided a valuable clue for the activation of secondary metabolites.
Collapse
|
4
|
Narisetty V, Okibe MC, Amulya K, Jokodola EO, Coulon F, Tyagi VK, Lens PNL, Parameswaran B, Kumar V. Technological advancements in valorization of second generation (2G) feedstocks for bio-based succinic acid production. BIORESOURCE TECHNOLOGY 2022; 360:127513. [PMID: 35772717 DOI: 10.1016/j.biortech.2022.127513] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 06/21/2022] [Accepted: 06/22/2022] [Indexed: 06/15/2023]
Abstract
Succinic acid (SA) is used as a commodity chemical and as a precursor in chemical industry to produce other derivatives such as 1,4-butaneidol, tetrahydrofuran, fumaric acid, and bio-polyesters. The production of bio-based SA from renewable feedstocks has always been in the limelight owing to the advantages of renewability, abundance and reducing climate change by CO2 capture. Considering this, the current review focuses on various 2G feedstocks such as lignocellulosic biomass, crude glycerol, and food waste for cost-effective SA production. It also highlights the importance of producing SA via separate enzymatic hydrolysis and fermentation, simultaneous saccharification and fermentation, and consolidated bioprocessing. Furthermore, recent advances in genetic engineering, and downstream SA processing are thoroughly discussed. It also elaborates on the techno-economic analysis and life cycle assessment (LCA) studies carried out to understand the economics and environmental effects of bio-based SA synthesis.
Collapse
Affiliation(s)
- Vivek Narisetty
- School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK
| | | | - K Amulya
- National University of Ireland Galway, University Road, H91TK33 Galway, Ireland
| | | | - Frederic Coulon
- School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK
| | - Vinay Kumar Tyagi
- Environmental Hydrology Division, National Institute of Hydrology (NIH), Roorkee 247667, Uttarakhand, India
| | - Piet N L Lens
- National University of Ireland Galway, University Road, H91TK33 Galway, Ireland
| | - Binod Parameswaran
- Microbial Processes and Technology Division, CSIR - National Institute for Interdisciplinary Science and Technology, Trivandrum, Kerala 695019, India
| | - Vinod Kumar
- School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK.
| |
Collapse
|
5
|
Stylianou E, Pateraki C, Ladakis D, Damala C, Vlysidis A, Latorre-Sánchez M, Coll C, Lin CSK, Koutinas A. Bioprocess development using organic biowaste and sustainability assessment of succinic acid production with engineered Yarrowia lipolytica strain. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2021.108099] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
6
|
Hospet R, Thangadurai D, Cruz-Martins N, Sangeetha J, Anu Appaiah KA, Chowdhury ZZ, Bedi N, Soytong K, Al Tawahaj ARM, Jabeen S, Tallur MM. Genome shuffling for phenotypic improvement of industrial strains through recursive protoplast fusion technology. Crit Rev Food Sci Nutr 2021:1-10. [PMID: 34592865 DOI: 10.1080/10408398.2021.1983763] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Strains' improvement technology plays an essential role in enhancing the quality of industrial strains. Several traditional methods and modern techniques have been used to further improve strain engineering programs. The advances stated in strain engineering and the increasing demand for microbial metabolites leads to the invention of the genome shuffling technique, which ensures a specific phenotype improvement through inducing mutation and recursive protoplast fusion. In such technique, the selection of multi-parental strains with distinct phenotypic traits is crucial. In addition, as this evolutionary strain improvement technique involves combinative approaches, it does not require any gene sequence data for genome alteration and, therefore, strains developed by this elite technique will not be considered as genetically modified organisms. In this review, the different stages involved in the genome shuffling technique and its wide applications in various phenotype improvements will be addressed. Taken together, data discussed here highlight that the use of genome shuffling for strain improvement will be a plus for solving complex phenotypic traits and in promoting the rapid development of other industrially important strains.
Collapse
Affiliation(s)
| | | | - Natália Cruz-Martins
- Faculty of Medicine, University of Porto, Porto, Portugal.,Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal.,Institute of Research and Advanced Training in Health Sciences and Technologies (CESPU), Gandra PRD, Portugal
| | - Jeyabalan Sangeetha
- Department of Environmental Science, Central University of Kerala, Kasaragod, Kerala, India
| | - Konerira Aiyappa Anu Appaiah
- Department of Microbiology and Fermentation Technology, Central Food Technological Research Institute (CSIR), Mysore, Karnataka, India
| | - Zaira Zaman Chowdhury
- Nanotechnology and Catalysis Research Center (NANOCAT), Institute of Advanced Studies (IAS), University of Malaya, Kuala Lumpur, Malaysia
| | - Namita Bedi
- Amity Institute of Biotechnology, Amity University, Noida, Uttar Pradesh, India
| | - Kasem Soytong
- Department of Plant Production Technology, King Mongkut's Institute of Technology Ladkrabang (KMITL), Ladkrabang, Bangkok, Thailand
| | | | - Shoukat Jabeen
- Department of Botany, Karnatak University, Dharwad, Karnataka, India
| | | |
Collapse
|
7
|
Zhang W, Tao Y, Wu M, Xin F, Dong W, Zhou J, Gu J, Ma J, Jiang M. Adaptive evolution improves acid tolerance and succinic acid production in Actinobacillus succinogenes. Process Biochem 2020. [DOI: 10.1016/j.procbio.2020.08.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
|
8
|
Yu P, Wang X, Ren Q, Huang X, Yan T. Genome shuffling for improving the activity of alkaline pectinase in Bacillus subtilis FS105 and its molecular mechanism. World J Microbiol Biotechnol 2019; 35:165. [PMID: 31641866 DOI: 10.1007/s11274-019-2749-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 10/15/2019] [Indexed: 11/25/2022]
Abstract
Genome shuffling for improving the activity of alkaline pectinase in Bacillus subtilis FS105 and its molecular mechanism were investigated. The fused strain B. subtilis FS105 with the highest activity of alkaline pectinase was obtained after two rounds of genome shuffling. The activity of alkaline pectinase in B. subtilis FS105 was 499 U/ml, which was improved by 1.6 times compared to that in original strain. To elucidate its molecular mechanism, rpsL gene sequences from original and fused strains were cloned and aligned, and the space structure of their coding proteins were also analyzed and compared. The alignment of the rpsL gene sequences indicated that three bases G, G and C were respectively replaced by A, A and G in the positions 52, 408 and 409 after genome shuffling. This resulted in the substitution of two amino acid residues in ribosomal protein S12: D18N and P137A, and therefore improving the biosynthesis of alkaline pectinase. This study lays a foundation for improving the activity of alkaline pectinase by genome shuffling and understanding its molecular mechanism.
Collapse
Affiliation(s)
- Ping Yu
- College of Food Science and Biotechnology, Zhejiang Gongshang University, 149 Jiaogong Road, Hangzhou, 310035, Zhejiang, People's Republic of China.
| | - Xinxin Wang
- College of Food Science and Biotechnology, Zhejiang Gongshang University, 149 Jiaogong Road, Hangzhou, 310035, Zhejiang, People's Republic of China
| | - Qian Ren
- College of Food Science and Biotechnology, Zhejiang Gongshang University, 149 Jiaogong Road, Hangzhou, 310035, Zhejiang, People's Republic of China
| | - Xingxing Huang
- College of Food Science and Biotechnology, Zhejiang Gongshang University, 149 Jiaogong Road, Hangzhou, 310035, Zhejiang, People's Republic of China
| | - Tingting Yan
- College of Food Science and Biotechnology, Zhejiang Gongshang University, 149 Jiaogong Road, Hangzhou, 310035, Zhejiang, People's Republic of China
| |
Collapse
|
9
|
Ferone M, Raganati F, Olivieri G, Marzocchella A. Bioreactors for succinic acid production processes. Crit Rev Biotechnol 2019; 39:571-586. [DOI: 10.1080/07388551.2019.1592105] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Mariateresa Ferone
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Napoli, Italy
- UCD School of Agriculture & Food Science, University College Dublin, Dublin, Ireland
| | - Francesca Raganati
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Napoli, Italy
| | - Giuseppe Olivieri
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Napoli, Italy
- Department of Agrotechnology and Food Sciences, Wageningen University and Research Centre, Wageningen, The Netherlands
| | - Antonio Marzocchella
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Napoli, Italy
| |
Collapse
|
10
|
Opportunities, challenges, and future perspectives of succinic acid production by Actinobacillus succinogenes. Appl Microbiol Biotechnol 2018; 102:9893-9910. [PMID: 30259101 DOI: 10.1007/s00253-018-9379-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/04/2018] [Accepted: 09/06/2018] [Indexed: 12/21/2022]
Abstract
Due to environmental issues and the depletion of fossil-based resources, ecofriendly sustainable biomass-based chemical production has been given more attention recently. Succinic acid (SA) is one of the top value added bio-based chemicals. It can be synthesized through microbial fermentation using various waste steam bioresources. Production of chemicals from waste streams has dual function as it alleviates environmental concerns; they could have caused because of their improper disposal and transform them into valuable products. To date, Actinobacillus succinogenes is termed as the best natural SA producer. However, few reviews regarding SA production by A. succinogenes were reported. Herewith, pathways and metabolic engineering strategies, biomass pretreatment and utilization, and process optimization related with SA fermentation by A. succinogenes were discussed in detail. In general, this review covered vital information including merits, achievements, progresses, challenges, and future perspectives in SA production using A. succinogenes. Therefore, it is believed that this review will provide platform to understand the potential of the strain and tackle existing hurdles so as to develop superior strain for industrial applications. It will also be used as a baseline for identification, isolation, and improvement of other SA-producing microbes.
Collapse
|
11
|
Continuous Succinic Acid Fermentation by Actinobacillus Succinogenes: Assessment of Growth and Succinic Acid Production Kinetics. Appl Biochem Biotechnol 2018; 187:782-799. [DOI: 10.1007/s12010-018-2846-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 07/16/2018] [Indexed: 11/30/2022]
|
12
|
Genome shuffling and high-throughput screening of Brevibacterium flavum MDV1 for enhanced l-valine production. World J Microbiol Biotechnol 2018; 34:121. [DOI: 10.1007/s11274-018-2502-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 07/10/2018] [Indexed: 11/25/2022]
|
13
|
Evolutionary engineering of industrial microorganisms-strategies and applications. Appl Microbiol Biotechnol 2018; 102:4615-4627. [DOI: 10.1007/s00253-018-8937-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 03/13/2018] [Accepted: 03/13/2018] [Indexed: 10/17/2022]
|
14
|
Tong QQ, Zhou YH, Chen XS, Wu JY, Wei P, Yuan LX, Yao JM. Genome shuffling and ribosome engineering of Streptomyces virginiae for improved virginiamycin production. Bioprocess Biosyst Eng 2018; 41:729-738. [DOI: 10.1007/s00449-018-1906-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 01/31/2018] [Indexed: 10/18/2022]
|
15
|
Ferone M, Raganati F, Ercole A, Olivieri G, Salatino P, Marzocchella A. Continuous succinic acid fermentation by Actinobacillus succinogenes in a packed-bed biofilm reactor. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:138. [PMID: 29785205 PMCID: PMC5950251 DOI: 10.1186/s13068-018-1143-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 05/03/2018] [Indexed: 05/23/2023]
Abstract
BACKGROUND Succinic acid is one of the most interesting platform chemicals that can be produced in a biorefinery approach. In this study, continuous succinic acid production by Actinobacillus succinogenes fermentation in a packed-bed biofilm reactor (PBBR) was investigated. RESULTS The effects of the operating conditions tested, dilution rate (D), and medium composition (mixture of glucose, xylose, and arabinose-that simulate the composition of a lignocellulosic hydrolysate)-on the PBBR performances were investigated. The maximum succinic acid productivity of 35.0 g L-1 h-1 and the maximum SA concentration were achieved at a D = 1.9 h-1. The effect of HMF and furfural on succinic acid production was also investigated. HMF resulted to reduce succinic acid production by 22.6%, while furfural caused a reduction of 16% in SA production at the same dilution rate. CONCLUSION Succinic acid production by A. succinogenes fermentation in a packed-bed reactor (PBBR) was successfully carried out for more than 5 months. The optimal results were obtained at the dilution rate 0.5 h-1: 43.0 g L-1 of succinic acid were produced, glucose conversion was 88%; and the volumetric productivity was 22 g L-1 h-1.
Collapse
Affiliation(s)
- Mariateresa Ferone
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Francesca Raganati
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Alessia Ercole
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Giuseppe Olivieri
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
- Wageningen University and Research Centre, Droevendaalsesteeg 1, P.O. Box 8129, 6708 PB Wageningen, The Netherlands
| | - Piero Salatino
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Antonio Marzocchella
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| |
Collapse
|
16
|
Construction of fibrous bed bioreactor for enhanced succinic acid production using wastewater of dextran fermentation. Bioprocess Biosyst Eng 2017; 40:1859-1866. [DOI: 10.1007/s00449-017-1839-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 09/06/2017] [Indexed: 10/18/2022]
|
17
|
Metabolic Engineering of Actinobacillus succinogenes Provides Insights into Succinic Acid Biosynthesis. Appl Environ Microbiol 2017. [PMID: 28625987 DOI: 10.1128/aem.00996-17] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Actinobacillus succinogenes, a Gram-negative facultative anaerobe, exhibits the native capacity to convert pentose and hexose sugars to succinic acid (SA) with high yield as a tricarboxylic acid (TCA) cycle intermediate. In addition, A. succinogenes is capnophilic, incorporating CO2 into SA, making this organism an ideal candidate host for conversion of lignocellulosic sugars and CO2 to an emerging commodity bioproduct sourced from renewable feedstocks. In this work, we report the development of facile metabolic engineering capabilities in A. succinogenes, enabling examination of SA flux determinants via knockout of the primary competing pathways-namely, acetate and formate production-and overexpression of the key enzymes in the reductive branch of the TCA cycle leading to SA. Batch fermentation experiments with the wild-type and engineered strains using pentose-rich sugar streams demonstrate that the overexpression of the SA biosynthetic machinery (in particular, the enzyme malate dehydrogenase) enhances flux to SA. Additionally, removal of competitive carbon pathways leads to higher-purity SA but also triggers the generation of by-products not previously described from this organism (e.g., lactic acid). The resultant engineered strains also lend insight into energetic and redox balance and elucidate mechanisms governing organic acid biosynthesis in this important natural SA-producing microbe.IMPORTANCE Succinic acid production from lignocellulosic residues is a potential route for enhancing the economic feasibility of modern biorefineries. Here, we employ facile genetic tools to systematically manipulate competing acid production pathways and overexpress the succinic acid-producing machinery in Actinobacillus succinogenes Furthermore, the resulting strains are evaluated via fermentation on relevant pentose-rich sugar streams representative of those from corn stover. Overall, this work demonstrates genetic modifications that can lead to succinic acid production improvements and identifies key flux determinants and new bottlenecks and energetic needs when removing by-product pathways in A. succinogenes metabolism.
Collapse
|
18
|
Preparation of A. succinogenes immobilized microfiber membrane for repeated production of succinic acid. Enzyme Microb Technol 2017; 98:34-42. [DOI: 10.1016/j.enzmictec.2016.12.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/07/2016] [Accepted: 12/19/2016] [Indexed: 11/19/2022]
|
19
|
Zhu LW, Xia ST, Wei LN, Li HM, Yuan ZP, Tang YJ. Enhancing succinic acid biosynthesis in Escherichia coli by engineering its global transcription factor, catabolite repressor/activator (Cra). Sci Rep 2016; 6:36526. [PMID: 27811970 PMCID: PMC5109907 DOI: 10.1038/srep36526] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Accepted: 10/17/2016] [Indexed: 11/09/2022] Open
Abstract
This study was initiated to improve E. coli succinate production by engineering the E. coli global transcription factor, Cra (catabolite repressor/activator). Random mutagenesis libraries were generated through error-prone PCR of cra. After re-screening and mutation site integration, the best mutant strain was Tang1541, which provided a final succinate concentration of 79.8 ± 3.1 g/L: i.e., 22.8% greater than that obtained using an empty vector control. The genes and enzymes involved in phosphoenolpyruvate (PEP) carboxylation and the glyoxylate pathway were activated, either directly or indirectly, through the mutation of Cra. The parameters for interaction of Cra and DNA indicated that the Cra mutant was bound to aceBAK, thereby activating the genes involved in glyoxylate pathway and further improving succinate production even in the presence of its effector fructose-1,6-bisphosphate (FBP). It suggested that some of the negative effect of FBP on Cra might have been counteracted through the enhanced binding affinity of the Cra mutant for FBP or the change of Cra structure. This work provides useful information about understanding the transcriptional regulation of succinate biosynthesis.
Collapse
Affiliation(s)
- Li-Wen Zhu
- School of Public Health, Wuhan University, Wuhan 430071 China.,Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, Hubei University of Technology, Wuhan 430068 China
| | - Shi-Tao Xia
- Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, Hubei University of Technology, Wuhan 430068 China
| | - Li-Na Wei
- Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, Hubei University of Technology, Wuhan 430068 China
| | - Hong-Mei Li
- Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, Hubei University of Technology, Wuhan 430068 China
| | - Zhan-Peng Yuan
- School of Public Health, Wuhan University, Wuhan 430071 China
| | - Ya-Jie Tang
- Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, Hubei University of Technology, Wuhan 430068 China
| |
Collapse
|
20
|
Pateraki C, Patsalou M, Vlysidis A, Kopsahelis N, Webb C, Koutinas AA, Koutinas M. Actinobacillus succinogenes : Advances on succinic acid production and prospects for development of integrated biorefineries. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2016.04.005] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
21
|
Salvachúa D, Smith H, St John PC, Mohagheghi A, Peterson DJ, Black BA, Dowe N, Beckham GT. Succinic acid production from lignocellulosic hydrolysate by Basfia succiniciproducens. BIORESOURCE TECHNOLOGY 2016; 214:558-566. [PMID: 27179951 DOI: 10.1016/j.biortech.2016.05.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2016] [Revised: 05/05/2016] [Accepted: 05/06/2016] [Indexed: 05/03/2023]
Abstract
The production of chemicals alongside fuels will be essential to enhance the feasibility of lignocellulosic biorefineries. Succinic acid (SA), a naturally occurring C4-diacid, is a primary intermediate of the tricarboxylic acid cycle and a promising building block chemical that has received significant industrial attention. Basfia succiniciproducens is a relatively unexplored SA-producing bacterium with advantageous features such as broad substrate utilization, genetic tractability, and facultative anaerobic metabolism. Here B. succiniciproducens is evaluated in high xylose-content hydrolysates from corn stover and different synthetic media in batch fermentation. SA titers in hydrolysate at an initial sugar concentration of 60g/L reached up to 30g/L, with metabolic yields of 0.69g/g, and an overall productivity of 0.43g/L/h. These results demonstrate that B. succiniciproducens may be an attractive platform organism for bio-SA production from biomass hydrolysates.
Collapse
Affiliation(s)
- Davinia Salvachúa
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
| | - Holly Smith
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
| | - Peter C St John
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
| | - Ali Mohagheghi
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
| | - Darren J Peterson
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
| | - Brenna A Black
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
| | - Nancy Dowe
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA
| | - Gregg T Beckham
- National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA.
| |
Collapse
|
22
|
Chen P, Tao S, Zheng P. Efficient and repeated production of succinic acid by turning sugarcane bagasse into sugar and support. BIORESOURCE TECHNOLOGY 2016; 211:406-13. [PMID: 27035471 DOI: 10.1016/j.biortech.2016.03.108] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 03/17/2016] [Accepted: 03/19/2016] [Indexed: 05/22/2023]
Abstract
Here we reported an endeavor in making full use of sugarcane bagasse for biological production of succinic acid. Through NaOH pre-treatment and multi-enzyme hydrolysis, a reducing sugar solution mainly composed of glucose and xylose was obtained from the sugarcane bagasse. By optimizing portions of cellulase, xylanase, β-glucanase and pectinase in the multi-enzyme "cocktail", the hydrolysis percentage of the total cellulose in pre-treated sugarcane bagasse can be as high as 88.5%. A. succinogenes CCTCC M2012036 was used for converting reducing sugars into succinic acid in a 3-L bioreactor with a sugar-fed strategy to prevent cell growth limitation. Importantly, cells were found to be adaptive on the sugarcane bagasse residue, offering possibilities of repeated batch fermentation and replacement for MgCO3 with soluble NaHCO3 in pH modulation. Three cycles of fermentation without activity loss were realized with the average succinic acid yield and productivity to be 80.5% and 1.65g·L(-1)·h(-1).
Collapse
Affiliation(s)
- Pengcheng Chen
- Jiangnan University, The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Wuxi 214122, China
| | - Shengtao Tao
- Jiangnan University, The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Wuxi 214122, China
| | - Pu Zheng
- Jiangnan University, The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Wuxi 214122, China.
| |
Collapse
|
23
|
Sadhukhan S, Villa R, Sarkar U. Microbial production of succinic acid using crude and purified glycerol from a Crotalaria juncea based biorefinery. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2016; 10:84-93. [PMID: 28352528 PMCID: PMC5040874 DOI: 10.1016/j.btre.2016.03.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 02/08/2016] [Accepted: 03/31/2016] [Indexed: 11/23/2022]
Abstract
Microbial conversion of crude and purified glycerol obtained in the process of biorefining Crotalaria juncea is carried out to produce succinic acid using Escherichia coli. Batch tests are performed for nine different substrate concentrations of commercial, purified and crude glycerol, in order to observe cell growth and substrate utilization rate. Inhibitory (Halden-Andrew, Aiba-Edward, Tessier type and Andrews) as well as non-inhibitory (Monod, Moser and Tessier) models are fitted to the relationship between specific growth rate and substrate concentration obtained from the growth curves. Considering the inhibition effect, Aiba-Edward model ranked 1 out of 7 in case of two samples and Haldane-Andrew model ranked 1 in case of one sample. Aiba-Edward model gave the best fitment for a large range of concentrations of all the three types of glycerol, crude, purified and laboratory grade. Maximum production of succinic acid is obtained from commercial glycerol at pH 7 and 37.5 °C.
Collapse
Affiliation(s)
- Suvra Sadhukhan
- Department of Chemical Engineering, Jadavpur University, Kolkata 700032, India
| | - Raffaella Villa
- School of Energy, Environment and Agrifood, Cranfield University, Beds MK43 0AL, United Kingdom
| | - Ujjaini Sarkar
- Department of Chemical Engineering, Jadavpur University, Kolkata 700032, India
| |
Collapse
|
24
|
Sosa PA, Roca C, Velizarov S. Membrane assisted recovery and purification of bio-based succinic acid for improved process sustainability. J Memb Sci 2016. [DOI: 10.1016/j.memsci.2015.12.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
25
|
Li SB, Qian Y, Liang ZW, Guo Y, Zhao MM, Pang ZW. Enhanced butanol production from cassava with Clostridium acetobutylicum by genome shuffling. World J Microbiol Biotechnol 2016; 32:53. [DOI: 10.1007/s11274-016-2022-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 01/29/2016] [Indexed: 11/29/2022]
|
26
|
Zhang G, Lin Y, Qi X, Wang L, He P, Wang Q, Ma Y. Genome shuffling of the nonconventional yeast Pichia anomala for improved sugar alcohol production. Microb Cell Fact 2015; 14:112. [PMID: 26246027 PMCID: PMC4527335 DOI: 10.1186/s12934-015-0303-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 07/22/2015] [Indexed: 08/30/2023] Open
Abstract
Background Sugar alcohols have been widely applied in the fields of food and medicine owing to their unique properties. Compared to chemical production, microbial production of sugar alcohols has become attractive because of its environmentally friendly and sustainable characteristics. Our previous study identified the nonconventional yeast Pichia anomala TIB-x229 as a potential producer of sugar alcohols from glucose. To further improve strain performance, we combined genome shuffling with optimized high throughput screening methods for the directed improvement of nonconventional yeast and complex phenotypes. Results To accelerate strain improvement, a practical genome shuffling procedure was developed and successfully applied in the nonconventional yeast P. anomala to increase sugar alcohol production. Through two rounds of genome shuffling, an improved P. anomala isolate GS2-3 could produce 47.1 g/L total sugar alcohols from 100 g/L glucose, which was 32.3% higher than the original strain. In this process, a simple and accurate colorimetric assay was optimized and used for high throughput screening of sugar alcohol-producing strains. Moreover, a fluorescence-activated cell sorting method was developed to efficiently screen protoplast fusions for genome shuffling of nonconventional yeast. Conclusion An efficient genome shuffling procedure was developed and applied to enhance the sugar alcohol production of the nonconventional yeast P. anomala. Our results provide a general platform for strain improvement of polyol-producing microorganisms or nonconventional microorganisms in the future. Electronic supplementary material The online version of this article (doi:10.1186/s12934-015-0303-8) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Guoqiang Zhang
- Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 XiQiDao, Tianjin Airport Economic Area, Tianjin, 300308, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Yuping Lin
- Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 XiQiDao, Tianjin Airport Economic Area, Tianjin, 300308, China.
| | - Xianni Qi
- Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 XiQiDao, Tianjin Airport Economic Area, Tianjin, 300308, China.
| | - Lixian Wang
- Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 XiQiDao, Tianjin Airport Economic Area, Tianjin, 300308, China.
| | - Peng He
- Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Qinhong Wang
- Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 XiQiDao, Tianjin Airport Economic Area, Tianjin, 300308, China.
| | - Yanhe Ma
- Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 XiQiDao, Tianjin Airport Economic Area, Tianjin, 300308, China.
| |
Collapse
|
27
|
Enhancement of ε-poly-lysine production in ε-poly-lysine-tolerant Streptomyces sp. by genome shuffling. Bioprocess Biosyst Eng 2015; 38:1705-13. [DOI: 10.1007/s00449-015-1410-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 04/29/2015] [Indexed: 10/23/2022]
|
28
|
Rafieenia R. Metabolic capabilities of Actinobacillus succinogenes for succinic acid production. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2014. [DOI: 10.1590/0104-6632.20140314s00002997] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
29
|
Yan Q, Zheng P, Tao ST, Dong JJ. Fermentation process for continuous production of succinic acid in a fibrous bed bioreactor. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2014.08.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
30
|
Succinic acid production with Actinobacillus succinogenes: rate and yield analysis of chemostat and biofilm cultures. Microb Cell Fact 2014. [PMID: 25259880 DOI: 10.1186/s12934-014-0111-6.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Succinic acid is well established as bio-based platform chemical with production quantities expecting to increase exponentially within the next decade. Actinobacillus succinogenes is by far the most studied wild organism for producing succinic acid and is known for high yield and titre during production on various sugars in batch culture. At low shear conditions continuous fermentation with A. succinogenes results in biofilm formation. In this study, a novel shear controlled fermenter was developed that enabled: 1) chemostat operation where self-immobilisation was opposed by high shear rates and, 2) in-situ removal of biofilm by increasing shear rates and subsequent analysis thereof. RESULTS The volumetric productivity of the biofilm fermentations were an order of magnitude more than the chemostat runs. In addition the biofilm runs obtained substantially higher yields. Succinic acid to acetic acid ratios for chemostat runs were 1.28±0.2 g.g(-1), while the ratios for biofilm runs started at 2.4 g.g(-1) and increased up to 3.3 g.g(-1) as glucose consumption increased. This corresponded to an overall yield on glucose of 0.48±0.05 g.g(-1) for chemostat runs, while the yields varied between 0.63 g.g(-1) and 0.74 g.g(-1) for biofilm runs. Specific growth rates (μ) were shown to be severely inhibited by the formation of organic acids, with μ only 12% of μ(max) at a succinic acid titre of 7 g.L(-1). Maintenance production of succinic acid was shown to be dominant for the biofilm runs with cell based production rates (extracellular polymeric substance removed) decreasing as SA titre increases. CONCLUSIONS The novel fermenter allowed for an in-depth bioreaction analysis of A. succinogenes. Biofilm cells achieve higher SA yields than suspended cells and allow for operation at higher succinic acid titre. Both growth and maintenance rates were shown to drastically decrease with succinic acid titre. The A. succinogenes biofilm process has vast potential, where self-induced high cell densities result in higher succinic acid productivity and yield.
Collapse
|
31
|
Succinic acid production with Actinobacillus succinogenes: rate and yield analysis of chemostat and biofilm cultures. Microb Cell Fact 2014; 13:111. [PMID: 25259880 PMCID: PMC4154526 DOI: 10.1186/s12934-014-0111-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Accepted: 07/23/2014] [Indexed: 01/11/2023] Open
Abstract
Background Succinic acid is well established as bio-based platform chemical with production quantities expecting to increase exponentially within the next decade. Actinobacillus succinogenes is by far the most studied wild organism for producing succinic acid and is known for high yield and titre during production on various sugars in batch culture. At low shear conditions continuous fermentation with A. succinogenes results in biofilm formation. In this study, a novel shear controlled fermenter was developed that enabled: 1) chemostat operation where self-immobilisation was opposed by high shear rates and, 2) in-situ removal of biofilm by increasing shear rates and subsequent analysis thereof. Results The volumetric productivity of the biofilm fermentations were an order of magnitude more than the chemostat runs. In addition the biofilm runs obtained substantially higher yields. Succinic acid to acetic acid ratios for chemostat runs were 1.28±0.2 g.g-1, while the ratios for biofilm runs started at 2.4 g.g-1 and increased up to 3.3 g.g-1 as glucose consumption increased. This corresponded to an overall yield on glucose of 0.48±0.05 g.g-1 for chemostat runs, while the yields varied between 0.63 g.g-1 and 0.74 g.g-1 for biofilm runs. Specific growth rates (μ) were shown to be severely inhibited by the formation of organic acids, with μ only 12% of μmax at a succinic acid titre of 7 g.L-1. Maintenance production of succinic acid was shown to be dominant for the biofilm runs with cell based production rates (extracellular polymeric substance removed) decreasing as SA titre increases. Conclusions The novel fermenter allowed for an in-depth bioreaction analysis of A. succinogenes. Biofilm cells achieve higher SA yields than suspended cells and allow for operation at higher succinic acid titre. Both growth and maintenance rates were shown to drastically decrease with succinic acid titre. The A. succinogenes biofilm process has vast potential, where self-induced high cell densities result in higher succinic acid productivity and yield.
Collapse
|
32
|
Zhao Y, Jiang C, Yu H, Fang F, Yang J. Genome shuffling of Aspergillus glaucus HGZ-2 for enhanced cellulase production. Appl Biochem Biotechnol 2014; 174:1246-1259. [PMID: 25099375 DOI: 10.1007/s12010-014-1102-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 07/22/2014] [Indexed: 01/01/2023]
Abstract
The production of cellulase from Aspergillus glaucus HGZ-2 was improved by using genome shuffling. The starting populations, obtained by UV irradiation, were subjected to recursive protoplast fusion. The optimal conditions for protoplast formation and regeneration were 7 mg/ml snailase and 5 mg/ml cellulase at 34 °C for 3.0 h using 0.7 M NaCl as an osmotic stabilizer. The protoplasts were inactivated under UV for 30 min or heated at 50 °C for 50 min, and a fusant probability of about 100 % was observed. The positive colonies were created by fusing the inactivated protoplasts. The optimal conditions for protoplast fusion were PEG6000 concentration of 35 %, CaCl2 concentration of 0.02 M, and incubation time of 12 min. After two rounds of genome shuffling, one strain (Y) was obtained. Its filter paper cellulase (FPase) and carboxymethyl cellulase (CMCase) activity reached 71 and 70 U/ml, respectively, which were increased by 1.95-fold and 1.72-fold in comparison with that of its ancestor strain. The results indicated that genome shuffling was an efficient means for the improved production of cellulases by A. glaucus HGZ-2.
Collapse
Affiliation(s)
- Yuping Zhao
- School of Life Science and Chemical Engineering, Huaiyin Institute of Technology, Huaian, 223003, Jiangsu, People's Republic of China. .,Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, Jiangsu, People's Republic of China. .,Jiangsu Provincial Engineering Laboratory for Biomass Conversion and Process Integration, Huaiyin Institute of Technology, Huaian, 223003, Jiangsu, People's Republic of China.
| | - Changxing Jiang
- School of Life Science and Chemical Engineering, Huaiyin Institute of Technology, Huaian, 223003, Jiangsu, People's Republic of China.,Jiangsu Provincial Engineering Laboratory for Biomass Conversion and Process Integration, Huaiyin Institute of Technology, Huaian, 223003, Jiangsu, People's Republic of China
| | - Hupeng Yu
- School of Life Science and Chemical Engineering, Huaiyin Institute of Technology, Huaian, 223003, Jiangsu, People's Republic of China
| | - Fang Fang
- School of Life Science and Chemical Engineering, Huaiyin Institute of Technology, Huaian, 223003, Jiangsu, People's Republic of China
| | - Jingzhu Yang
- School of Life Science and Chemical Engineering, Huaiyin Institute of Technology, Huaian, 223003, Jiangsu, People's Republic of China
| |
Collapse
|
33
|
Evolutionary engineering by genome shuffling. Appl Microbiol Biotechnol 2014; 98:3877-87. [PMID: 24595425 DOI: 10.1007/s00253-014-5616-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 02/11/2014] [Accepted: 02/12/2014] [Indexed: 01/28/2023]
Abstract
An upsurge in the bioeconomy drives the need for engineering microorganisms with increasingly complex phenotypes. Gains in productivity of industrial microbes depend on the development of improved strains. Classical strain improvement programmes for the generation, screening and isolation of such mutant strains have existed for several decades. An alternative to traditional strain improvement methods, genome shuffling, allows the directed evolution of whole organisms via recursive recombination at the genome level. This review deals chiefly with the technical aspects of genome shuffling. It first presents the diversity of organisms and phenotypes typically evolved using this technology and then reviews available sources of genetic diversity and recombination methodologies. Analysis of the literature reveals that genome shuffling has so far been restricted to microorganisms, both prokaryotes and eukaryotes, with an overepresentation of antibiotics- and biofuel-producing microbes. Mutagenesis is the main source of genetic diversity, with few studies adopting alternative strategies. Recombination is usually done by protoplast fusion or sexual recombination, again with few exceptions. For both diversity and recombination, prospective methods that have not yet been used are also presented. Finally, the potential of genome shuffling for gaining insight into the genetic basis of complex phenotypes is also discussed.
Collapse
|
34
|
Chain elongation in anaerobic reactor microbiomes to recover resources from waste. Curr Opin Biotechnol 2014; 27:115-22. [PMID: 24487179 DOI: 10.1016/j.copbio.2014.01.003] [Citation(s) in RCA: 212] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 12/30/2013] [Accepted: 01/06/2014] [Indexed: 01/17/2023]
Abstract
Different microbial pathways can elongate the carbon chains of molecules in open cultures of microbial populations (i.e. reactor microbiomes) under anaerobic conditions. Here, we discuss three such pathways: 1. homoacetogenesis to combine two carbon dioxide molecules into acetate; 2. succinate formation to elongate glycerol with one carbon from carbon dioxide; and 3. reverse β oxidation to elongate short-chain carboxylates with two carbons into medium-chain carboxylates, leading to more energy-dense and insoluble products (e.g. easier to separate from solution). The ability to use reactor microbiomes to treat complex substrates can simultaneously address two pressing issues: 1. providing proper waste management; and 2. producing renewable chemicals and fuels.
Collapse
|