1
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Zhang L, Wang D, Shi P, Li J, Niu J, Chen J, Wang G, Wu L, Chen L, Yang Z, Li S, Meng J, Ruan F, He Y, Zhao H, Ren Z, Wang Y, Liu Y, Shi X, Wang Y, Liu Q, Li J, Wang P, Wang J, Zhu Y, Cheng G. A naturally isolated symbiotic bacterium suppresses flavivirus transmission by Aedes mosquitoes. Science 2024; 384:eadn9524. [PMID: 38669573 DOI: 10.1126/science.adn9524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 03/15/2024] [Indexed: 04/28/2024]
Abstract
The commensal microbiota of the mosquito gut plays a complex role in determining the vector competence for arboviruses. In this study, we identified a bacterium from the gut of field Aedes albopictus mosquitoes named Rosenbergiella sp. YN46 (Rosenbergiella_YN46) that rendered mosquitoes refractory to infection with dengue and Zika viruses. Inoculation of 1.6 × 103 colony forming units (CFUs) of Rosenbergiella_YN46 into A. albopictus mosquitoes effectively prevents viral infection. Mechanistically, this bacterium secretes glucose dehydrogenase (RyGDH), which acidifies the gut lumen of fed mosquitoes, causing irreversible conformational changes in the flavivirus envelope protein that prevent viral entry into cells. In semifield conditions, Rosenbergiella_YN46 exhibits effective transstadial transmission in field mosquitoes, which blocks transmission of dengue virus by newly emerged adult mosquitoes. The prevalence of Rosenbergiella_YN46 is greater in mosquitoes from low-dengue areas (52.9 to ~91.7%) than in those from dengue-endemic regions (0 to ~6.7%). Rosenbergiella_YN46 may offer an effective and safe lead for flavivirus biocontrol.
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Affiliation(s)
- Liming Zhang
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
- Institute of Infectious Diseases, Shenzhen Bay Laboratory, Shenzhen 518000, China
- Institute of Pathogenic Organisms, Shenzhen Center for Disease Control and Prevention, Shenzhen 518055, China
| | - Daxi Wang
- Shenzhen Key Laboratory of Unknown Pathogen Identification, BGI Research, Shenzhen 518083, China
| | - Peibo Shi
- Shenzhen Key Laboratory of Unknown Pathogen Identification, BGI Research, Shenzhen 518083, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Juzhen Li
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
| | - Jichen Niu
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
| | - Jielong Chen
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
| | - Gang Wang
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
| | - Linjuan Wu
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
| | - Lu Chen
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
| | - Zhenxing Yang
- Yunnan Tropical and Subtropical Animal Viral Disease Laboratory, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650000, China
| | - Susheng Li
- Yunnan Tropical and Subtropical Animal Viral Disease Laboratory, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650000, China
| | - Jinxin Meng
- Yunnan Tropical and Subtropical Animal Viral Disease Laboratory, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650000, China
| | - Fangchao Ruan
- Kunming Medical University, Kunming, Yunnan 650000, China
| | - Yuwen He
- Yunnan Tropical and Subtropical Animal Viral Disease Laboratory, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650000, China
| | - Hailong Zhao
- Shenzhen Key Laboratory of Unknown Pathogen Identification, BGI Research, Shenzhen 518083, China
| | - Zirui Ren
- Shenzhen Key Laboratory of Unknown Pathogen Identification, BGI Research, Shenzhen 518083, China
| | - Yibaina Wang
- China National Center for Food Safety Risk Assessment, Beijing 100022, China
| | - Yang Liu
- Institute of Infectious Diseases, Shenzhen Bay Laboratory, Shenzhen 518000, China
| | - Xiaolu Shi
- Institute of Pathogenic Organisms, Shenzhen Center for Disease Control and Prevention, Shenzhen 518055, China
| | - Yunfu Wang
- Institute of Neuroscience, Hubei University of Medicine, Shiyan, Hubei 442000, China
| | - Qiyong Liu
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - Junhua Li
- Shenzhen Key Laboratory of Unknown Pathogen Identification, BGI Research, Shenzhen 518083, China
| | - Penghua Wang
- Department of Immunology, School of Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA
| | - Jinglin Wang
- Yunnan Tropical and Subtropical Animal Viral Disease Laboratory, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650000, China
| | - Yibin Zhu
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
- Institute of Pathogenic Organisms, Shenzhen Center for Disease Control and Prevention, Shenzhen 518055, China
| | - Gong Cheng
- New Cornerstone Science Laboratory, Tsinghua University-Peking University Joint Center for Life Sciences, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China
- Institute of Infectious Diseases, Shenzhen Bay Laboratory, Shenzhen 518000, China
- Institute of Pathogenic Organisms, Shenzhen Center for Disease Control and Prevention, Shenzhen 518055, China
- Southwest United Graduate School, Kunming 650092, China
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2
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Yu Y, Wei P, Zhu X, Huang L, Cai J, Xu Z. High-level production of soluble pyrroloquinoline quinone-dependent glucose dehydrogenase inEscherichia coli. Eng Life Sci 2012. [DOI: 10.1002/elsc.201100224] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Yi Yu
- Department of Chemical and Biological Engineering; Institute of Biological Engineering; Zhejiang University; Hangzhou; P. R. China
| | - Peilian Wei
- Department of Biochemical Engineering; Zhejiang University of Science and Technology; Hangzhou; P. R. China
| | - Xiangcheng Zhu
- Hunan Engineering Research Center of Combinatorial Biosynthesis and Natural Product Drug Discovery; Changsha; Hunan; P. R. China
| | - Lei Huang
- Department of Chemical and Biological Engineering; Institute of Biological Engineering; Zhejiang University; Hangzhou; P. R. China
| | - Jin Cai
- Department of Chemical and Biological Engineering; Institute of Biological Engineering; Zhejiang University; Hangzhou; P. R. China
| | - Zhinan Xu
- Department of Chemical and Biological Engineering; Institute of Biological Engineering; Zhejiang University; Hangzhou; P. R. China
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3
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Sashidhar B, Podile AR. Mineral phosphate solubilization by rhizosphere bacteria and scope for manipulation of the direct oxidation pathway involving glucose dehydrogenase. J Appl Microbiol 2009; 109:1-12. [PMID: 20070432 DOI: 10.1111/j.1365-2672.2009.04654.x] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Microbial biodiversity in the soil plays a significant role in metabolism of complex molecules, helps in plant nutrition and offers countless new genes, biochemical pathways, antibiotics and other metabolites, useful molecules for agronomic productivity. Phosphorus being the second most important macro-nutrient required by the plants, next to nitrogen, its availability in soluble form in the soils is of great importance in agriculture. Microbes present in the soil employ different strategies to make use of unavailable forms of phosphate and in turn also help plants making phosphate available for plant use. Azotobacter, a free-living nitrogen fixer, is known to increase the fertility of the soil and in turn the productivity of different crops. The glucose dehydrogenase gene, the first enzyme in the direct oxidation pathway, contributes significantly to mineral phosphate solubilization ability in several Gram-negative bacteria. It is possible to enhance further the biofertilizer potential of plant growth-promoting rhizobacteria by introducing the genes involved mineral phosphate solubilization without affecting their ability to fix nitrogen or produce phytohormones for dual benefit to agricultural crops. Glucose dehydrogenases from Gram-negative bacteria can be engineered to improve their ability to use different substrates, function at higher temperatures and EDTA tolerance, etc., through site-directed mutagenesis.
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Affiliation(s)
- B Sashidhar
- Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Central University, Hyderabad, Andhra Pradesh, India
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4
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Abstract
The similarity between the structural scaffold of PQQGDH and that of sialidase in the absence of any similarity in the primary structure, catalytic function and substrate recognition encouraged us to attempt a W-motif exchange between these enzymes. By substituting one W-motif in PQQGDH with one from sialidase, a chimeric PQQGDH was constructed, and its enzymatic properties were investigated. The overexpression of the chimeric enzyme resulted in the formation of an inclusion body. However, the refolding procedure resulted in a soluble chimeric enzyme with PQQGDH activity showing similar secondary-structure components as native PQQGDH. In contrast to native PQQGDH, the chimeric PQQGDH showed thermal instability and sensitivity to EDTA; this difference might have been due to the incomplete compatibility of the inserted W-motif. The potential of W-motif replacement was also discussed in view of the possible molecular evolution/engineering of beta-propeller structures.
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Affiliation(s)
- Atsushi Tachino
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
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5
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Tripura C, Podile AR. Properties of a chimeric glucose dehydrogenase improved by site directed mutagenesis. J Biotechnol 2007; 131:197-204. [PMID: 17669536 DOI: 10.1016/j.jbiotec.2007.06.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2007] [Revised: 05/31/2007] [Accepted: 06/20/2007] [Indexed: 11/20/2022]
Abstract
Glucose dehydrogenase, a membrane bound enzyme oxidizing glucose to gluconic acid in the periplasmic space of Gram-negative bacteria plays a key role in mineral phosphate solubilization and is also an industrially important enzyme, being used as a glucose biosensor. A chimeric glucose dehydrogenase (ES chimera) encoding the N-terminal transmembrane domain from Escherichia coli and the C-terminal periplasmic domain from Serratia marcescens was constructed and the expression was studied on MacConkey glucose medium. The phosphate solubilizing ability of the chimeric GDH was also evaluated, substantiating the role of GDH in mineral phosphate solubilization (MPS). Four mutants of ES chimeric GDH were generated by site directed mutagenesis and the enzyme properties studied. Though the substrate affinity was unaltered for E742K and Y771M, the affinity of H775A and EYH/KMA to glucose and galactose decreased marginally and the affinity to maltose increased. Though Y771M showed a decreased GDH activity there was an increase in the heat tolerance. All the mutants showed an increase in the EDTA tolerance. The triple mutant EYH/KMA showed improved heat and EDTA tolerance and also an increase in affinity to maltose over the ES chimeric GDH.
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Affiliation(s)
- Chaturvedula Tripura
- Department of Plant Sciences, University of Hyderabad, P.O. Central University, Hyderabad 500046, Andhra Pradesh, India
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6
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Igarashi S, Okuda J, Ikebukuro K, Sode K. Molecular engineering of PQQGDH and its applications. Arch Biochem Biophys 2004; 428:52-63. [PMID: 15234269 DOI: 10.1016/j.abb.2004.06.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2004] [Revised: 06/07/2004] [Indexed: 10/26/2022]
Affiliation(s)
- Satoshi Igarashi
- National Institute for Materials Science, 1-1, Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
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7
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Igarashi S, Hirokawa T, Sode K. Engineering PQQ glucose dehydrogenase with improved substrate specificity. ACTA ACUST UNITED AC 2004; 21:81-9. [PMID: 15113562 DOI: 10.1016/j.bioeng.2003.12.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2003] [Revised: 12/22/2003] [Accepted: 12/23/2003] [Indexed: 11/19/2022]
Abstract
Site-directed mutagenesis was carried out on the active site of water-soluble PQQ glucose dehydrogenase (PQQGDH-B) to improve its substrate specificity. Amino acid substitution of His168 resulted in a drastic decrease in the enzyme's catalytic activity, consistent with its putative catalytic role. Substitutions were also carried out in neighboring residues, Lys166, Asp167, and Gln169, in an attempt to alter the enzyme's substrate binding site. Lys166 and Gln169 mutants showed only minor changes in substrate specificity profiles. In sharp contrast, mutants of Asp167 showed considerably altered specificity profiles. Of the numerous Asp167 mutants characterized, Asp167Glu showed the best substrate specificity profile, while retaining most of its catalytic activity for glucose and stability. We also investigated the cumulative effect of combining the Asp167Glu substitution with the previously reported Asn452Thr mutation. Interpretation of the effect of the replacement of Asp167 to Glu on the alteration of substrate specificity in relation with the predicted 3D model of PQQGDH-B is also discussed.
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Affiliation(s)
- Satoshi Igarashi
- Department of Biotechnology, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
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8
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TAKAHASHI Y, IGARASHI S, NAKAZAWA Y, TSUGAWA W, SODE K. Construction and Characterization of Glucose Enzyme Sensor Employing Engineered Water Soluble PQQ Glucose Dehydrogenase with Improved Thermal Stability. ELECTROCHEMISTRY 2000. [DOI: 10.5796/electrochemistry.68.907] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Yuka TAKAHASHI
- Department of Biotechnology, Tokyo University of Agriculture and Technology
| | - Satoshi IGARASHI
- Department of Biotechnology, Tokyo University of Agriculture and Technology
| | - Yukie NAKAZAWA
- Department of Biotechnology, Tokyo University of Agriculture and Technology
| | - Wakako TSUGAWA
- Department of Biotechnology, Tokyo University of Agriculture and Technology
| | - Koji SODE
- Department of Biotechnology, Tokyo University of Agriculture and Technology
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9
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YAMAZAKI T, YASUTAKE N, SODE K. Surface Deposition Method; A Novel Protein Immobilization Procedure on a Sensor Surface. ELECTROCHEMISTRY 2000. [DOI: 10.5796/electrochemistry.68.882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Tomohiko YAMAZAKI
- Department of Biotechnology, Tokyo University of Agriculture and Technology
| | - Nozomu YASUTAKE
- Department of Biotechnology, Tokyo University of Agriculture and Technology
| | - Koji SODE
- Department of Biotechnology, Tokyo University of Agriculture and Technology
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10
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11
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Increasing the thermal stability of the water-soluble pyrroloquinoline quinone glucose dehydrogenase by single amino acid replacement. Enzyme Microb Technol 2000; 26:491-496. [PMID: 10771051 DOI: 10.1016/s0141-0229(99)00196-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Based on the characterization of a PCR mutation of water-soluble glucose dehydrogenase possessing pyrroloquinoline quinone (PQQ), PQQGDH-B, Ser231Cys, we have constructed a series of Ser231 variants. The replacement of Ser231 to Cys, Met, Leu, Asp, Asn, His, or Lys resulted in an increase in thermal stability. Among these variants, Ser231Lys showed the highest level of thermal stability and also showed high catalytic activity. Considering that Ser231Lys showed more than an 8-fold increase in its half-life during the thermal inactivation at 55 degrees C compared with the wild-type enzyme, and also retained catalytic activity similar to a wild-type enzyme, the application of this mutant enzyme as a glucose sensor constituent may develop into a stable glucose sensor construction.
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12
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Igarashi S, Ohtera T, Yoshida H, Witarto AB, Sode K. Construction and characterization of mutant water-soluble PQQ glucose dehydrogenases with altered K(m) values--site-directed mutagenesis studies on the putative active site. Biochem Biophys Res Commun 1999; 264:820-4. [PMID: 10544015 DOI: 10.1006/bbrc.1999.1157] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Based on a PCR mutant enzyme of water-soluble glucose dehydrogenase-harboring pyrroloquinoline quinone as the prosthetic group, PQQGDH-B, a site-directed mutagenesis study was carried out. The substitution of Glu277 residue with Gly resulted in a decrease in the K(m) value for glucose and altered the substrate specificity profile, compared with the wild-type enzyme. Mutational analyses on the neighboring amino acid residues of Glu277 were also carried out and constructed Asp275Glu, Asp276Glu, Ile278Phe, and Asn279His. Considering that Asp275Glu, Asp276Glu and also Glu277Gly showed drastic decreases in EDTA tolerance, this region may construct a PQQGDH-B putative active site, such as a binding site for Ca(2+), which is responsible for the binding PQQ. A series of Glu277 variants, Glu277 substituted by Ala, Val, Asp, Asn, His, Gln, or to Lys, was constructed and they all showed decreased K(m) values and altered substrate specificity profiles. Among them, Glu277Lys showed similar thermal stability with the wild-type enzyme, but its catalytic efficiency increased significantly, compared with the wild-type enzyme. The potential applications of Glu277Lys in analytical use are also discussed.
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Affiliation(s)
- S Igarashi
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei, Tokyo, 184-8588, Japan
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13
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Yoshida H, Kojima K, Witarto AB, Sode K. Engineering a chimeric pyrroloquinoline quinone glucose dehydrogenase: improvement of EDTA tolerance, thermal stability and substrate specificity. PROTEIN ENGINEERING 1999; 12:63-70. [PMID: 10065712 DOI: 10.1093/protein/12.1.63] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
An engineered Escherichia coli PQQ glucose dehydrogenase (PQQGDH) with improved enzymatic characteristics was constructed by substituting and combining the gene-encoding protein regions responsible for EDTA tolerance, thermal stability and substrate specificity. The protein region responsible for complete EDTA tolerance in Acinetobacter calcoaceticus, which is recognized as the indicator of high stability in co-factor binding, was elucidated. The region is located between 32 and 59% from the N-terminus of A. calcoaceticus PQQGDH(A27 region) and also corresponds to the same position from 32 to 59% from the N-terminus in E. coli PQQGDH, though E. coli PQQGDH is EDTA sensitive. We previously reported that the C-terminal 3% region of A. calcoaceticus (A3 region) played an important role in the increase of thermal stability, and that His775Asn substitution in E. coli PQQGDH resulted in an increase in the substrate specificity of E. coli PQQGDH towards glucose. Based on these findings, chimeric and/or mutated PQQGDHs, E97A3 H775N, E32A27E41 H782N, E32A27E38A3 and E32A27E38A3 H782N were constructed to investigate the compatibility of two protein regions and one amino acid substitution. His775 substitution to Asn corresponded to His782 substitution to Asn (H782N) in chimeric enzymes harbouring the A27 region. Since all the chimeric PQQGDHs harbouring the A27 region were EDTA tolerant, the A27 region was found to be compatible with the other region and substituted amino acid responsible for the improvement of enzymatic properties. The contribution of the A3 region to thermal stability complemented the decrease in the thermal stability due to the His775 or His782 substitution to Asn. E32A27E38A3 H782N, which harbours all the above mentioned three regions, showed improved EDTA tolerance, thermal stability and substrate specificity. These results suggested a strategy for the construction of a semi-artificial enzyme by substituting and combining the gene-encoding protein regions responsible for the improvement of enzyme characteristics. The characteristics of constructed chimeric PQQGDH are discussed based on the predicted model, beta-propeller structure.
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Affiliation(s)
- H Yoshida
- Department of Biotechnology, Faculty of Technology, Tokyo University of Agriculture and Technology, Koganei, Japan
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14
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Yamada M, Inbe H, Tanaka M, Sumi K, Matsushita K, Adachi O. Mutant isolation of the Escherichia coli quinoprotein glucose dehydrogenase and analysis of crucial residues Asp-730 and His-775 for its function. J Biol Chem 1998; 273:22021-7. [PMID: 9705344 DOI: 10.1074/jbc.273.34.22021] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Several mutants of quinoprotein glucose dehydrogenase (GDH) in Escherichia coli were obtained and characterized. Of these, significant mutants were further characterized by kinetic analysis after purification or by site-directed mutagenesis to introduce different amino acid substitutions. H775R and H775A showed a pronounced reduction of affinity for a prosthetic group, pyrroloquinoline quinone (PQQ), suggesting that His-775 may directly interact with PQQ. D730N and D730A showed low glucose oxidase activity without influence on the affinity for PQQ, Mg2+, or substrate, but D730R showed reduced affinity for PQQ. The spectrum of tryptophan fluorescence revealed that the local structure surrounding PQQ was not changed by D730N mutation. Based on these data, we assume that Asp-730 may occur close to PQQ and function as a proton (and also electron) donor to PQQ or acceptor from PQQH2. Substitutions of Gly-689, that are located at the end of a unique segment of GDH among homologous quinoprotein dehydrogenases, directed reduction of the affinity for PQQ or GDH activity. Therefore, the unique segment and Asp-730 may play a specific role for GDH, which might be related to the intramolecular electron transfer from PQQ to ubiquinone.
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Affiliation(s)
- M Yamada
- Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi 753-8515, Japan.
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15
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Sode K, Shimakita T, Ohuchi S, Yamazaki T. Stabilization of pyrroloquinoline quinone glucose dehydrogenase by cross-linking chemical modification. Biotechnol Lett 1996. [DOI: 10.1007/bf00129720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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16
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Sode K, Ito K, Witarto AB, Watanabe K, Yoshida H, Postma P. Increased production of recombinant pyrroloquinoline quinone (PQQ) glucose dehydrogenase by metabolically engineered Escherichia coli strain capable of PQQ biosynthesis. J Biotechnol 1996; 49:239-43. [PMID: 8879174 DOI: 10.1016/0168-1656(96)01540-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We have previously shown that the production of recombinant Escherichia coli PQQGDH was greatly improved by using a medium supplemented with the cofactor PQQ, which is not synthesized in E. coli. We show here that the increase in the accumulated PQQGDH is due to the increased stability of the holo-enzyme over apo-enzyme, using recombinant Acinetobacter calcoaceticus PQQGDH. In order to achieve cost-effective PQQGDH production, we incorporated the genes for PQQ biosynthetic pathway from Klebsiella pneumoniae into E. coli, which as a result allowed E. coli to produce PQQ. Using this metabolically engineered E. coli strain as a host, a 10-fold increase in the production of recombinant A. calcoaceticus PQQGDH was achieved, compared to the condition without PQQ and MgCl2.
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Affiliation(s)
- K Sode
- Department of Biotechnology, Faculty of Technology, Tokyo University of Agriculture and Technology, Japan
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17
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Sode K, Sugimoto S, Watanabe M, Tsugawa W. Effect of PQQ glucose dehydrogenase overexpression in Escherichia coli on sugar-dependent respiration. J Biotechnol 1995; 43:41-4. [PMID: 8573321 DOI: 10.1016/0168-1656(95)00112-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Pyrroloquinoline quinone glucose dehydrogenase (PQQGDH) was overexpressed in Escherichia coli, and its impact on sugar-dependent respiration was investigated. Sugar-dependent respiration patterns under PQQGDH overexpression can be devided into two types. The first type involves D-glucose and D-mannose, which are utilized by the phosphotransferase system (PTS) and are also the substrates of PQQGDH. As a result of PQQGDH overexpression, the apparent Km value of sugar-dependent respiration shifted to higher concentration compared with E. coli parental cells. The second type included D-xylose and D-galactose, which are the substrates of PQQGDH, but not the PTS sugars. PQQGDH overexpressing cells showed much higher respiration than parental cells. These results suggested that PQQGDH overexpression may alter sugar utilization preferences in E. coli, suggesting further possible applications in metabolic engineering for carbon source utilization.
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Affiliation(s)
- K Sode
- Department of Biotechnology, Faculty of Technology, Tokyo University of Agriculture and Technology, Japan
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18
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Abstract
The thermal stability of PQQ glucose dehydrogenases (PQQGDHs) which were chimeras with more than 95% made up of the N-terminal region of Escherichia coli PQQGDH and the rest made up of the C-terminal region of Acinetobacter calcoaceticus PQQGDH was investigated. Among the chimeric PQQGDHs, E97A3 (E. coli 97% and A. calcoaceticus 3%) and E95A5 were found to possess higher thermal stability than parental E. coli PQQGDH. Further detailed characterization of the thermal stability was carried out, focusing on E97A3. E97A3 showed a more than 3-fold and 12-fold increase in half life time at 40 degrees C, compared with the PQQGDHs of E. coli and A. calcoaceticus, respectively. Using transition state theory, the increase in the free energy of inactivation observed in E97A3 was compared with those of the E. coli and A. calcoaceticus parental enzymes. The region responsible for this stabilization was also discussed.
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Affiliation(s)
- K Sode
- Department of Biotechnology, Faculty of Technology, Tokyo University of Agriculture and Technology, Japan
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