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Millan F, Hanik N. Degradation kinetics of medium chain length Polyhydroxyalkanoate degrading enzyme: a quartz crystal microbalance study. Front Bioeng Biotechnol 2023; 11:1303267. [PMID: 38162181 PMCID: PMC10756687 DOI: 10.3389/fbioe.2023.1303267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 12/01/2023] [Indexed: 01/03/2024] Open
Abstract
This study investigates the enzymatic degradation processes of different classes of polyhydroxyalkanoates (PHAs), a group of biopolymers naturally synthesized by various microorganisms. Medium chain length PHAs (mcl-PHAs) are distinguished biopolymers due to their biodegradability and diverse material properties. Using quartz crystal microbalance measurements as a valuable tool for accurate real-time monitoring of the enzymatic degradation process, the research provides detailed kinetic data, describing the interaction between enzymes and substrates during the enzymatic degradation process. Thin films of poly-3-hydroxybutyrate (PHB) and polyhydroxyoctanoate copolymer (PHO), containing molar fractions of about 84% 3-hydroxyoctanoate and 16% 3-hydroxyhexanoate, were exposed to scl-depolymerases from Pseudomonas lemoignei LMG 2207 and recombinant mcl-depolymerase produced in Escherichia coli DH5α harboring the plasmid pMAD8, respectively. Analyses based on a heterogeneous kinetic model for the polymer degradation indicated a six-fold stronger adsorption equilibrium constant of mcl-depolymerase to PHO. Conversely, the degradation rate constant was approximately twice as high for scl-depolymerases acting on PHB. Finally, the study highlights the differences in enzyme-substrate interactions and degradation mechanisms between the investigated scl- and mcl-PHAs.
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Affiliation(s)
| | - Nils Hanik
- Institute of Life Technologies, School of Engineering, University of Applied Science and Arts Western Switzerland, Sion, Switzerland
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Rapid synthesis of sustainable poly(ethylene 2,5-furandicarboxylate)-block-poly(tetramethylene oxide) multiblock copolymers with tailor-made properties via a cascade polymerization route. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Greene AF, Vaidya A, Collet C, Wade KR, Patel M, Gaugler M, West M, Petcu M, Parker K. 3D-Printed Enzyme-Embedded Plastics. Biomacromolecules 2021; 22:1999-2009. [PMID: 33870685 DOI: 10.1021/acs.biomac.1c00105] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A simple and environmentally friendly approach toward the thermoplastic processing of rapidly degradable plastic-enzyme composites using three-dimensional (3D) printing techniques is described. Polycaprolactone/Amano lipase (PCL/AL) composite films (10 mm × 10 mm; height [h] = ∼400 μm) with an AL loading of 0.1, 1.0, and 5.0% were prepared via 3D printing techniques that entail direct mixing in the solid state and thermal layer-by-layer extrusion. It was found that AL can tolerate in situ processing temperatures up to 130 °C in the solid-state for 60 min without loss of enzymatic activity. The composites were degraded in phosphate buffer (8 mg/mL, composite to buffer) for 7 days at 37 °C and the resulting average percent total weight loss (WLavg %) was found to be 5.2, 92.9, and 100%, for the 0.1, 1.0, and 5.0% films, respectively. The degradation rates of PCL/AL composites were found to be faster than AL applied externally in the buffer. Thicker PCL/AL 1.0% films (10 mm × 10 mm; h = ∼500 μm) were also degraded over a 7 day period to examine how the weight loss occurs over time with 3.0, 18.1, 36.4, 46.4, and 70.2% weight loss for days 1, 2, 3, 4, and 7, respectively. Differential scanning calorimetry (DSC) analysis shows that the film's percent crystallinity (Dxtal%) increases over time with Dxtal% = 46.5 for day 0 and 53.1% for day 7. Scanning electron microscopy (SEM) analysis found that film erosion begins at the surface and that water can penetrate the interior via surface pores activating the enzymes embedded in the film. Controlled release experiments utilizing dye-loaded PCL/AL/dye (AL = 1.0%; dye = 0.1%) composites were degraded over a 7 day period with the bulk of the dye released by the fourth day. The PCL/AL multimaterial objects containing AL-resistant polylactic acid (PLA) were also printed and degraded to demonstrate the application of this material on more complex structures.
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Affiliation(s)
- Angelique F Greene
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Alankar Vaidya
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Christophe Collet
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Kelly R Wade
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Meeta Patel
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Marc Gaugler
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Mark West
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Miruna Petcu
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
| | - Kate Parker
- Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand
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Mozes-Koch R, Tanne E, Brodezki A, Yehuda R, Gover O, Rabinowitch HD, Sela I. Expression of the entire polyhydroxybutyrate operon of Ralstonia eutropha in plants. J Biol Eng 2017; 11:44. [PMID: 29201140 PMCID: PMC5696724 DOI: 10.1186/s13036-017-0062-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 05/22/2017] [Indexed: 11/24/2022] Open
Abstract
Background Previously we demonstrated that an entire bacterial operon (the PRN operon) is expressible in plants when driven by the Tomato -yellow-leaf-curl-virus (TYLCV) -derived universal vector IL-60. Petroleum-derived plastics are not degradable, and are therefore harmful to the environment. Fermentation of bacteria carrying operons for polyhydroxyalkanoates (PHAs) produces degradable bioplastics which are environmentally friendly. However, bacterial production of bioplastics is not cost-effective, and attention is turning to their production in plants. Such “green” plastics would be less expensive and environmentally friendly. Hence, attempts are being made to substitute petroleum-derived plastics with “green” plastics. However, transformation of plants with genes of operons producing bioplastics has deleterious effects. Transformation of plastids does not cause deleterious effects, however it is a complicated procedures. Results We have developed another TYLCV-based vector (SE100) and show that yet another bacterial operon (the phaCAB operon) when driven by SE100 is also expressed in plants. We employed the combination of SE100 and the phaCAB operon to drive the operon to the plastids and produce in plants a biodegradable plastic [polyhydroxybutyrate (PHB)]. Here we indicate that the bacterial operon (phaCAB), when driven by the newly developed universal plant vector SE100 is directed to chloroplasts and produces in plants PHB, a leading PHA. The PHB-producing plants circumvent the need for complicated technical procedures. Conclusion The viral vector system SE100 facilitated the production of the bio-plastic poly-3-hydroxybutyrate. This was achieved by using the full pha-CAB operon indicating that TYLCV based system can transcribe and translate genes from bacterial operons controlled by a single cis element. Our data hints to the participation of the chloroplasts in these processes.
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Affiliation(s)
- Rita Mozes-Koch
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100 Rehovot, Israel
| | - Edna Tanne
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100 Rehovot, Israel
| | - Alexandra Brodezki
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100 Rehovot, Israel
| | - Ran Yehuda
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100 Rehovot, Israel
| | - Ofer Gover
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100 Rehovot, Israel
| | - Haim D Rabinowitch
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100 Rehovot, Israel
| | - Ilan Sela
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100 Rehovot, Israel
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Gonçalves C, Gonçalves IC, Magalhães FD, Pinto AM. Poly(lactic acid) Composites Containing Carbon-Based Nanomaterials: A Review. Polymers (Basel) 2017; 9:E269. [PMID: 30970948 PMCID: PMC6431974 DOI: 10.3390/polym9070269] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 06/30/2017] [Accepted: 07/04/2017] [Indexed: 11/27/2022] Open
Abstract
Poly(lactic acid) (PLA) is a green alternative to petrochemical commodity plastics, used in packaging, agricultural products, disposable materials, textiles, and automotive composites. It is also approved by regulatory authorities for several biomedical applications. However, for some uses it is required that some of its properties be improved, namely in terms of thermo-mechanical and electrical performance. The incorporation of nanofillers is a common approach to attain this goal. The outstanding properties of carbon-based nanomaterials (CBN) have caused a surge in research works dealing with PLA/CBN composites. The available information is compiled and reviewed, focusing on PLA/CNT (carbon nanotubes) and PLA/GBM (graphene-based materials) composites. The production methods, and the effects of CBN loading on PLA properties, namely mechanical, thermal, electrical, and biological, are discussed.
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Affiliation(s)
- Carolina Gonçalves
- LEPABE-Faculdade de Engenharia, Universidade do Porto, rua Dr. Roberto Frias, Porto 4200-465, Portugal.
| | - Inês C Gonçalves
- INEB-National Institute of Biomedical Engineering, University of Porto, Rua do Campo Alegre, 823, Porto 4150-180, Portugal.
- i3S-Institute for Innovation and Health Research, University of Porto, Rua Alfredo Allen, 208, Porto 4200-135, Portugal.
| | - Fernão D Magalhães
- LEPABE-Faculdade de Engenharia, Universidade do Porto, rua Dr. Roberto Frias, Porto 4200-465, Portugal.
| | - Artur M Pinto
- LEPABE-Faculdade de Engenharia, Universidade do Porto, rua Dr. Roberto Frias, Porto 4200-465, Portugal.
- INEB-National Institute of Biomedical Engineering, University of Porto, Rua do Campo Alegre, 823, Porto 4150-180, Portugal.
- i3S-Institute for Innovation and Health Research, University of Porto, Rua Alfredo Allen, 208, Porto 4200-135, Portugal.
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Basu T, Tarafdar S. Influence of gamma irradiation on the electrical properties of LiClO 4 -gelatin solid polymer electrolytes: Modelling anomalous diffusion through generalized calculus. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2016.04.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Wu H, Fan Z, Jiang X, Chen J, Chen GQ. Enhanced production of polyhydroxybutyrate by multiple dividing E. coli. Microb Cell Fact 2016; 15:128. [PMID: 27465264 PMCID: PMC4964105 DOI: 10.1186/s12934-016-0531-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/21/2016] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Most bacteria are grown in a binary fission way meaning a bacterial cell is equally divided into two. Polyhydroxyalkanoates (PHA) can be accumulated as inclusion bodies by bacteria. The cell division way and morphology have been shown to play an important role in regulating the bacterial growth and PHA storages. RESULTS The common growth pattern of Escherichia coli was changed to multiple fission patterns by deleting fission related genes minC and minD together, allowing the formation of multiple fission rings (Z-rings) in several positions of an elongated cell, thus a bacterial cell was observed to be divided into more than two daughter cells at same time. To further improve cell growth and PHA production, some genes related with division process including ftsQ, ftsL, ftsW, ftsN and ftsZ, together with the cell shape control gene mreB, were all overexpressed in E. coli JM109 ∆minCD. The changing pattern of E. coli cell growth and morphology resulted in more cell dry weights (CDW) and more than 80 % polyhydroxybutyrate (PHB) accumulation increases compared to its binary fission control grown under the same conditions. CONCLUSIONS This study clearly demonstrated that combined over-expression genes ftsQ, ftsW, ftsN, ftsL and ftsZ together with shape control gene mreB in multiple division bacterial E. coli JM109 ∆minCD benefited PHA accumulation. Our study provides useful information on increasing the yield of PHA by changing the cell division pattern and cell morphology of E. coli.
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Affiliation(s)
- Hong Wu
- School of Life Sciences, Tsinghua University, Beijing, 100084, China.,Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Zhongyun Fan
- School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Xiaoran Jiang
- School of Life Sciences, Tsinghua University, Beijing, 100084, China.,Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Jinchun Chen
- School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Guo-Qiang Chen
- School of Life Sciences, Tsinghua University, Beijing, 100084, China. .,Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China. .,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, 100084, China. .,Center for Nano and Micro Mechanics, MOE, Tsinghua University, Beijing, 100084, China. .,MOE Key Lab of Industrial Biocatalysis, Dept Chemical Engineering, Tsinghua University, Beijing, 100084, China.
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Rheological, thermal, and mechanical properties of P (3HB- co-4HB) and P (3HB- co-4HB)/EVA blends. J Appl Polym Sci 2014. [DOI: 10.1002/app.41206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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9
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Stamboliev G, Milicevic D, Micic M, Suljovrujic E. Polyethylene crosslinked in different media: structural changes versus dielectric behaviour. Polym Bull (Berl) 2014. [DOI: 10.1007/s00289-014-1279-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Tsujii A, Namba M, Okamura H, Matsumoto A. Radical Alternating Copolymerization of Twisted 1,3-Butadienes with Maleic Anhydride as a New Approach for Degradable Thermosetting Resin. Macromolecules 2014. [DOI: 10.1021/ma501555n] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Asuka Tsujii
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai-shi, Osaka 599-8531, Japan
| | - Mami Namba
- Department
of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku,
Osaka 558-8585, Japan
| | - Haruyuki Okamura
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai-shi, Osaka 599-8531, Japan
| | - Akikazu Matsumoto
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai-shi, Osaka 599-8531, Japan
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