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Craig K, Johnson BR, Grunden A. Leveraging Pseudomonas Stress Response Mechanisms for Industrial Applications. Front Microbiol 2021; 12:660134. [PMID: 34040596 PMCID: PMC8141521 DOI: 10.3389/fmicb.2021.660134] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 04/12/2021] [Indexed: 12/25/2022] Open
Abstract
Members of the genus Pseudomonas are metabolically versatile and capable of adapting to a wide variety of environments. Stress physiology of Pseudomonas strains has been extensively studied because of their biotechnological potential in agriculture as well as their medical importance with regards to pathogenicity and antibiotic resistance. This versatility and scientific relevance led to a substantial amount of information regarding the stress response of a diverse set of species such as Pseudomonas chlororaphis, P. fluorescens, P. putida, P. aeruginosa, and P. syringae. In this review, environmental and industrial stressors including desiccation, heat, and cold stress, are cataloged along with their corresponding mechanisms of survival in Pseudomonas. Mechanisms of survival are grouped by the type of inducing stress with a focus on adaptations such as synthesis of protective substances, biofilm formation, entering a non-culturable state, enlisting chaperones, transcription and translation regulation, and altering membrane composition. The strategies Pseudomonas strains utilize for survival can be leveraged during the development of beneficial strains to increase viability and product efficacy.
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Affiliation(s)
- Kelly Craig
- AgBiome Inc., Research Triangle Park, NC, United States
| | | | - Amy Grunden
- Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC, United States
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2
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Woodcock SD, Syson K, Little RH, Ward D, Sifouna D, Brown JKM, Bornemann S, Malone JG. Trehalose and α-glucan mediate distinct abiotic stress responses in Pseudomonas aeruginosa. PLoS Genet 2021; 17:e1009524. [PMID: 33872310 PMCID: PMC8084333 DOI: 10.1371/journal.pgen.1009524] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/29/2021] [Accepted: 03/30/2021] [Indexed: 11/29/2022] Open
Abstract
An important prelude to bacterial infection is the ability of a pathogen to survive independently of the host and to withstand environmental stress. The compatible solute trehalose has previously been connected with diverse abiotic stress tolerances, particularly osmotic shock. In this study, we combine molecular biology and biochemistry to dissect the trehalose metabolic network in the opportunistic human pathogen Pseudomonas aeruginosa PAO1 and define its role in abiotic stress protection. We show that trehalose metabolism in PAO1 is integrated with the biosynthesis of branched α-glucan (glycogen), with mutants in either biosynthetic pathway significantly compromised for survival on abiotic surfaces. While both trehalose and α-glucan are important for abiotic stress tolerance, we show they counter distinct stresses. Trehalose is important for the PAO1 osmotic stress response, with trehalose synthesis mutants displaying severely compromised growth in elevated salt conditions. However, trehalose does not contribute directly to the PAO1 desiccation response. Rather, desiccation tolerance is mediated directly by GlgE-derived α-glucan, with deletion of the glgE synthase gene compromising PAO1 survival in low humidity but having little effect on osmotic sensitivity. Desiccation tolerance is independent of trehalose concentration, marking a clear distinction between the roles of these two molecules in mediating responses to abiotic stress. Author summary To survive outside their host, pathogenic bacteria must withstand various environmental stresses. The sugar molecule trehalose is associated with a range of abiotic stress tolerances, particularly osmotic shock. In this study, we analyse the trehalose metabolic network in the human pathogen Pseudomonas aeruginosa PAO1 and define its role in abiotic stress protection. We show that trehalose metabolism in PAO1 is intimately connected to the biosynthesis of branched α-glucan, or glycogen. Disruption of either trehalose or glycogen biosynthesis significantly reduces the ability of PAO1 to survive on steel work surfaces. While both trehalose and glycogen are important for stress tolerance, they counter very different stresses. Trehalose is important for the osmotic stress response, and survival in conditions of elevated salt. On the other hand, glycogen is responsible for desiccation tolerance and survival in low humidity environments. Trehalose does not apparently contribute to desiccation tolerance, marking a clear distinction between the roles of trehalose and glycogen in mediating abiotic stress responses in P. aeruginosa.
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Affiliation(s)
- Stuart D. Woodcock
- Department of Molecular Microbiology, John Innes Centre, Norwich, United Kingdom
| | - Karl Syson
- Department of Biological Chemistry, John Innes Centre, Norwich, United Kingdom
| | - Richard H. Little
- Department of Molecular Microbiology, John Innes Centre, Norwich, United Kingdom
| | - Danny Ward
- Department of Molecular Microbiology, John Innes Centre, Norwich, United Kingdom
| | - Despoina Sifouna
- School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
| | - James K. M. Brown
- Department of Crop Genetics, John Innes Centre, Norwich, United Kingdom
| | - Stephen Bornemann
- Department of Biological Chemistry, John Innes Centre, Norwich, United Kingdom
| | - Jacob G. Malone
- Department of Molecular Microbiology, John Innes Centre, Norwich, United Kingdom
- School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
- * E-mail:
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3
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Orozco-Mosqueda MDC, Duan J, DiBernardo M, Zetter E, Campos-García J, Glick BR, Santoyo G. The Production of ACC Deaminase and Trehalose by the Plant Growth Promoting Bacterium Pseudomonas sp. UW4 Synergistically Protect Tomato Plants Against Salt Stress. Front Microbiol 2019; 10:1392. [PMID: 31275294 PMCID: PMC6594411 DOI: 10.3389/fmicb.2019.01392] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 06/03/2019] [Indexed: 11/21/2022] Open
Abstract
Soil salinity is a major problem in agriculture. However, crop growth and productivity can be improved by the inoculation of plants with beneficial bacteria that promote plant growth under stress conditions such as high salinity. Here, we evaluated 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity and trehalose accumulation of the plant growth promoting bacterium Pseudomonas sp. UW4. Mutant strains (mutated at acdS, treS, or both) and a trehalose over-expressing strain (OxtreS) were constructed. The acdS mutant was ACC deaminase minus; the treS- strain significantly decreased its accumulation of trehalose, and the double mutant was affected in both characteristics. The OxtreS strain accumulated more trehalose than the wild-type strain UW4. Inoculating tomato plants subjected to salt stress with these strains significantly impacted root and shoot length, total dry weight, and chlorophyll content. The evaluated parameters in the single acdS and treS mutants were impaired. The double acdS/treS mutant was negatively affected to a greater extent than the single-gene mutants, suggesting a synergistic action of these activities in the protection of plants against salt stress. Finally, the OxtreS overproducing strain protected tomato plants to a greater extent under stress conditions than the wild-type strain. Taken together, these results are consistent with the synergistic action of ACC deaminase and trehalose in Pseudomonas sp. UW4 in the protection of tomato plants against salt stress.
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Affiliation(s)
- Ma Del Carmen Orozco-Mosqueda
- Department of Biology, University of Waterloo, Waterloo, ON, Canada.,Facultad de Agrobiología "Presidente Juárez," Universidad Michoacana de San Nicolás de Hidalgo, Uruapan, Mexico
| | - Jin Duan
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
| | | | - Elizabeth Zetter
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mexico
| | - Jesús Campos-García
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mexico
| | - Bernard R Glick
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
| | - Gustavo Santoyo
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mexico
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Liu H, Yang S, Wang X, Wang T. Production of trehalose with trehalose synthase expressed and displayed on the surface of Bacillus subtilis spores. Microb Cell Fact 2019; 18:100. [PMID: 31159804 PMCID: PMC6547511 DOI: 10.1186/s12934-019-1152-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 05/28/2019] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Bacillus subtilis spores have been commonly used for the surface display of various food-related or human antigens or enzymes. For successful display, the target protein needs to be fused with an anchor protein. The preferred anchored proteins are the outer-coat proteins of spores; outer-coat proteins G (CotG) and C (CotC) are commonly used. In this study, mutant trehalose synthase (V407M/K490L/R680E TreS) was displayed on the surface of B. subtilis WB800n spores using CotG and CotC individually or in combination as an anchoring protein. RESULTS Western blotting, immunofluorescence, dot blot, and enzymatic-activity assays detected TreS on the spore surface. The TreS activity with CotC and CotG together as the anchor protein was greater than the sum of the enzymatic activities with CotC or CotG alone. The TreS displayed on the spore surface with CotC and CotG together as the anchoring protein showed elevated and stable specific activity. To ensure spore stability and prevent spore germination in the trehalose preparation system, two germination-specific lytic genes, sleB and cwlJ, were deleted from the B. subtilis WB800n genome. It was demonstrated that this deletion did not affect the growth and spore formation of B. subtilis WB800n but strongly inhibited germination of the spores during transformation. The conversion rate of trehalose from 300 g/L maltose by B. subtilis strain WB800n(ΔsleB, ΔcwlJ)/cotC-treS-cotG-treS was 74.1% at 12 h (350 U/[g maltose]), and its enzymatic activity was largely retained, with a conversion rate of 73% after four cycles. CONCLUSIONS The spore surface display system based on food-grade B. subtilis with CotC and CotG as a combined carrier appears to be a powerful technology for TreS expression, which may be used for the biotransformation of D-maltose into D-trehalose.
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Affiliation(s)
- Hongling Liu
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), No. 3501, University Road, Changqing District, Jinan, 250353, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, People's Republic of China.,Key Laboratory of Industrial Fermentation Microbiology, Tianjin University of Science & Technology, Ministry of Education, Tianjin, 300457, People's Republic of China.,Tianjin Key Lab of Industrial Microbiology, Tianjin University of Science and Technology, Tianjin, 300457, People's Republic of China
| | - Shaojie Yang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), No. 3501, University Road, Changqing District, Jinan, 250353, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, People's Republic of China
| | - Xihui Wang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), No. 3501, University Road, Changqing District, Jinan, 250353, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, People's Republic of China
| | - Tengfei Wang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), No. 3501, University Road, Changqing District, Jinan, 250353, Shandong, People's Republic of China. .,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, People's Republic of China.
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Liu H, Wang X, Yang S, Wang R, Wang T. Saturation mutagenesis and self-inducible expression of trehalose synthase in Bacillus subtilis. Biotechnol Prog 2019; 35:e2826. [PMID: 31021505 DOI: 10.1002/btpr.2826] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 02/12/2019] [Accepted: 04/19/2019] [Indexed: 01/27/2023]
Abstract
Trehalose is a nonreducing disaccharide synthesized by trehalose synthase (TreS), which catalyzes the reversible interconversion of maltose and trehalose. We aimed to enhance the catalytic conversion of maltose to trehalose by saturation mutagenesis, and constructed a self-inducible TreS expression system by generating a robust Bacillus subtilis recombinant. We found that the conversion yield and enzymatic activity of TreS was enhanced by saturation mutations, especially by the combination of V407M and K490L mutations. At the same time, these saturation mutations were contributing to reducing by-products in the reaction. Compared to WT TreS, the conversion yield of maltose to trehalose was increased by 11.9%, and the kcat /Km toward trehalose was 1.33 times higher in the reaction catalyzed by treSV407M-K490L . treSV407M-K490L expression was further observed in the recombinant B. subtilis W800N(ΔσF ) under the influence of PsrfA , Pcry3Aa , and PsrfA-cry3Aa promoters without an inducer. It was shown that PsrfA-cry3Aa was evidently a stronger promoter for treSV407M-K490L expression, with the intracellular enzymatic activity of recombinant treSV407M-K490L being over 5,800 U/g at 35 hr in TB medium. These results suggested the combination of two mutations, V407M and K490L, was conducive for the production of trehalose. In addition, the self-inducible TreSV407M/K490L mutant in the B. subtilis host provides a low-cost choice for the industrial production of endotoxin-free trehalose with high yields.
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Affiliation(s)
- Hongling Liu
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, School of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China.,Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin, People's Republic of China
| | - Xihui Wang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, School of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China
| | - Shaojie Yang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, School of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China
| | - Ruiming Wang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, School of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China
| | - Tengfei Wang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China.,Key Laboratory of Shandong Microbial Engineering, School of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China
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6
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Liu H, Liu H, Yang S, Wang R, Wang T. Improved Expression and Optimization of Trehalose Synthase by Regulation of P glv in Bacillus subtilis. Sci Rep 2019; 9:6585. [PMID: 31036837 PMCID: PMC6488592 DOI: 10.1038/s41598-019-43172-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 04/08/2019] [Indexed: 01/08/2023] Open
Abstract
Trehalose synthase (TreS) converts maltose to trehalose, which has several important functions; therefore, enhancing TreS expression is desirable. Here, a recombinant Bacillus subtilis W800N (ΔamyE)-Pglv strain was constructed to achieve enhanced expression of TreS. Process optimization strategies were developed to improve the expression level of TreS in B. subtilis W800N (ΔamyE)-Pglv. Intracellular activity of TreS was induced using 60 g/L of maltose in shake flask culture. The protein activity reached 5211 ± 134 U/g at 33 °C and pH 7.0 in Luria-Bertani medium. A fed-batch fermentation strategy was applied in a 30 L fermenter containing 18 L terrific broth to achieve high cell density by replacing glycerol with high maltose syrup as a carbon source and an inducer. After 32 h of fermentation, recombinant B. subtilis W800N (ΔamyE)-Pglv activity reached 6850 ± 287 U/g dry cell weight. Our results demonstrate the efficiency of the Pglv promoter in increasing the expression of TreS in B. subtilis W800N (ΔamyE)-Pglv.
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Affiliation(s)
- Hongling Liu
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology(Shandong Academy of Sciences), Jinan, Shandong, 250353, China.,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, 250353, China.,Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin, 300457, China
| | - Hao Liu
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin, 300457, China
| | - Shaojie Yang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology(Shandong Academy of Sciences), Jinan, Shandong, 250353, China.,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, 250353, China
| | - Ruiming Wang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology(Shandong Academy of Sciences), Jinan, Shandong, 250353, China.,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, 250353, China
| | - Tengfei Wang
- State Key Laboratory of Biobased Material and Green Papermaking (LBMP), Qilu University of Technology(Shandong Academy of Sciences), Jinan, Shandong, 250353, China. .,Key Laboratory of Shandong Microbial Engineering, College of Bioengineering, QiLu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, 250353, China.
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7
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Xu C, Xu Q, Huang H, Jiang L. Enhancing the stability of trehalose synthase via SpyTag/SpyCatcher cyclization to improve its performance in industrial biocatalysts. Biosci Biotechnol Biochem 2018; 82:1473-1479. [DOI: 10.1080/09168451.2018.1475212] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
ABSTRACT
SpyTag and SpyCatcher can spontaneously and rapidly conjugate to form an irreversible and stable covalent bond. The trehalose synthase (TreS) from Thermomonospora curvata was successfully cyclized after the fusion of a SpyTag to its C-terminus and SpyCatcher to the N-terminus. Cyclized TreS retained more than 85% of its activity at temperatures ranging from 40 to 50°C and more than 95% at a pH range of 8 to 10, while the wild type kept only 60 and 80% of its activity under the same conditions. These results demonstrated that cyclized TreS had better resistance to high temperature and alkali than the wild type. Furthermore, structural analysis revealed that cyclized TreS had better conformational stability and was able to fold correctly at a higher temperature than the wild type. Our findings indicate that the use of SpyTag and SpyCatcher to cyclize enzymes is a promising strategy to increase their stability.
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Affiliation(s)
- Chao Xu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Qing Xu
- College of Pharmaceutical Sciences, Nanjing Tech University, Nanjing, China
| | - He Huang
- College of Pharmaceutical Sciences, Nanjing Tech University, Nanjing, China
| | - Ling Jiang
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing, China
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8
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Yang S, Lv X, Wang X, Wang J, Wang R, Wang T. Cell-Surface Displayed Expression of Trehalose Synthase from Pseudomonas putida ATCC 47054 in Pichia Pastoris Using Pir1p as an Anchor Protein. Front Microbiol 2017; 8:2583. [PMID: 29312257 PMCID: PMC5742630 DOI: 10.3389/fmicb.2017.02583] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 12/11/2017] [Indexed: 01/29/2023] Open
Abstract
Yeast cell-surface display technologies have been widely applied in the fields of food, medicine, and feed enzyme production, including lipase, α-amylase, and endoglucanase. In this study, a treS gene was fused with the yeast cell-surface anchor protein gene Pir1p by overlap PCR, the Pir1p-treS fusion gene was ligated into pPICZαA and pGAPZαA and transformed into P. pastoris GS115 to obtain recombinant yeast strains that displays trehalose synthase(TreS) on its cell surface as an efficient and recyclable whole-cell biocatalyst. Firstly, the enhanced green fluorescence protein gene (egfp) was used as the reporter protein to fusion the Pir1p gene and treS gene to construct the recombinant plasmids containing treS-egfg-Pir1p fusion gene, and electrotransformed into P. pastoris GS115 to analyze the surface display characteristics of fusion gene by Western blot, fluorescence microscopy and flow cytometry. The analysis shown that the treS-egfg-Pir1p fusion protein can be successfully displayed on the surface of yeast cell, and the expression level increased with the extension of fermentation time. These results implied that the Pir1p-treS fusion gene can be well displayed on the cell surface. Secondly, in order to obtain surface active cells with high enzyme activity, the enzymatic properties of TreS displayed on the cell surface was analyzed, and the fermentation process of recombinant P. patoris GS115 containing pPICZαA-Pir1p-treS and pGAPZαA-Pir1p-treS was studied respectively. The cell surface display TreS was stable over a broad range of temperatures (10-45°C) and pH (6.0-8.5). The activity of TreS displayed on cell surface respectively reached 1,108 Ug-1 under PAOX1 control for 150 h, and 1,109 Ug-1 under PGAP control for 75h in a 5 L fermenter, respectively. Lastly, the cell-surface displayed TreS was used to product trehalose using high maltose syrup as substrate at pH 8.0 and 15°C. The surface display TreS cells can be recycled for three times and the weight conversion rate of trehalose was more than 60%. This paper revealed that the TreS can display on the P. pastoris cell surface and still had a higher catalytic activity after recycled three times, which was suitable for industrial application, especially the preparation of pharmaceutical grade trehalose products.
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Affiliation(s)
- Shaojie Yang
- Key Laboratory of Shandong Microbial Engineering, Qilu University of Technology (ShanDong Academy of Sciences), Jinan, China
| | - Xin Lv
- Key Laboratory of Shandong Microbial Engineering, Qilu University of Technology (ShanDong Academy of Sciences), Jinan, China
| | - Xihui Wang
- Key Laboratory of Shandong Microbial Engineering, Qilu University of Technology (ShanDong Academy of Sciences), Jinan, China
| | - Junqing Wang
- Key Laboratory of Shandong Microbial Engineering, Qilu University of Technology (ShanDong Academy of Sciences), Jinan, China
| | - Ruiming Wang
- Key Laboratory of Shandong Microbial Engineering, Qilu University of Technology (ShanDong Academy of Sciences), Jinan, China
| | - Tengfei Wang
- Key Laboratory of Shandong Microbial Engineering, Qilu University of Technology (ShanDong Academy of Sciences), Jinan, China
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9
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Fu J, Sharma P, Spicer V, Krokhin OV, Zhang X, Fristensky B, Cicek N, Sparling R, Levin DB. Quantitative 'Omics Analyses of Medium Chain Length Polyhydroxyalkanaote Metabolism in Pseudomonas putida LS46 Cultured with Waste Glycerol and Waste Fatty Acids. PLoS One 2015; 10:e0142322. [PMID: 26544181 PMCID: PMC4636370 DOI: 10.1371/journal.pone.0142322] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 10/19/2015] [Indexed: 12/19/2022] Open
Abstract
Transcriptomes and proteomes of Pseudomonas putida LS46 cultured with biodiesel-derived waste glycerol or waste free fatty acids, as sole carbon sources, were compared under conditions that were either permissive or non-permissive for synthesis of medium chain length polyhydroxyalkanoates (mcl-PHA). The objectives of this study were to elucidate mechanisms that influence activation of biopolymer synthesis, intra-cellular accumulation, and monomer composition, and determine if these were physiologically specific to the carbon sources used for growth of P. putida LS46. Active mcl-PHA synthesis by P. putida LS46 was associated with high expression levels of key mcl-PHA biosynthesis genes and/or gene products including monomer-supplying proteins, PHA synthases, and granule-associated proteins. 'Omics data suggested that expression of these genes were regulated by different genetic mechanisms in P. putida LS46 cells in different physiological states, when cultured on the two waste carbon sources. Optimal polymer production by P. putida LS46 was primarily limited by less efficient glycerol metabolism during mcl-PHA synthesis on waste glycerol. Mapping the 'Omics data to the mcl-PHA biosynthetic pathway revealed significant variations in gene expression, primarily involved in: 1) glycerol transportation; 2) enzymatic reactions that recycle reducing equivalents and produce key mcl-PHA biosynthesis pathway intermediates (e.g. NADH/NADPH, acetyl-CoA). Active synthesis of mcl-PHAs was observed during exponential phase in cultures with waste free fatty acids, and was associated with the fatty acid beta-oxidation pathway. A putative Thioesterase in the beta-oxidation pathway that may regulate the level of fatty acid beta-oxidation intermediates, and thus carbon flux to mcl-PHA biosynthesis, was highly up-regulated. Finally, the data suggested that differences in expression of selected fatty acid metabolism and mcl-PHA monomer-supplying enzymes may play a role in determining the monomer composition of mcl-PHA polymers. Understanding the relationships between genome content, gene and gene product expression, and how these factors influence polymer synthesis, will aid in optimization of mcl-PHA production by P. putida LS46 using biodiesel waste streams.
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Affiliation(s)
- Jilagamazhi Fu
- Department of Biosystem Engineering, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Parveen Sharma
- Department of Biosystem Engineering, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Vic Spicer
- Department of Internal Medicine & Manitoba Centre for Proteomics and Systems Biology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Oleg V. Krokhin
- Department of Internal Medicine & Manitoba Centre for Proteomics and Systems Biology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Xiangli Zhang
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Brian Fristensky
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Nazim Cicek
- Department of Biosystem Engineering, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Richard Sparling
- Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - David. B. Levin
- Department of Biosystem Engineering, University of Manitoba, Winnipeg, Manitoba, Canada
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10
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Zheng Z, Xu Y, Sun Y, Mei W, Ouyang J. Biocatalytic Production of Trehalose from Maltose by Using Whole Cells of Permeabilized Recombinant Escherichia coli. PLoS One 2015; 10:e0140477. [PMID: 26462117 PMCID: PMC4603892 DOI: 10.1371/journal.pone.0140477] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 09/25/2015] [Indexed: 11/23/2022] Open
Abstract
Trehalose is a non-reducing disaccharide, which can protect proteins, lipid membranes, and cells from desiccation, refrigeration, dehydration, and other harsh environments. Trehalose can be produced by different pathways and trehalose synthase pathway is a convenient, practical, and low-cost pathway for the industrial production of trehalose. In this study, 3 candidate treS genes were screened from genomic databases of Pseudomonas and expressed in Escherichia coli. One of them from P. stutzeri A1501 exhibited the best transformation ability from maltose into trehalose and the least byproduct. Thus, whole cells of this recombinant E. coli were used as biocatalyst for trehalose production. In order to improve the conversion rate of maltose to trehalose, optimization of the permeabilization and biotransformation were carried out. Under optimal conditions, 92.2 g/l trehalose was produced with a high productivity of 23.1 g/(l h). No increase of glucose was detected during the whole course. The biocatalytic process developed in this study might serve as a candidate for the large scale production of trehalose.
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Affiliation(s)
- Zhaojuan Zheng
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People’s Republic of China
- Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing 210037, People’s Republic of China
| | - Ying Xu
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People’s Republic of China
| | - Ye Sun
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People’s Republic of China
| | - Wending Mei
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People’s Republic of China
| | - Jia Ouyang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People’s Republic of China
- Key Laboratory of Forest Genetics and Biotechnology of the Ministry of Education, Nanjing 210037, People’s Republic of China
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