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Marcos-García M, García-Fraile P, Filipová A, Menéndez E, Mateos PF, Velázquez E, Cajthaml T, Rivas R. Mesorhizobium bacterial strains isolated from the legume Lotus corniculatus are an alternative source for the production of polyhydroxyalkanoates (PHAs) to obtain bioplastics. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:17436-17445. [PMID: 28593540 DOI: 10.1007/s11356-017-9319-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 05/19/2017] [Indexed: 06/07/2023]
Abstract
Polyhydroxyalkanoic acids (PHAs) are natural polyesters that can be used to produce bioplastics which are biodegradable. Numerous microorganisms accumulate PHAs as energy reserves. Combinations of different PHAs monomers lead to the production of bioplastics with very different properties. In the present work, we show the capability of strains belonging to various phylogenetic lineages within the genus Mesorhizobium, isolated from Lotus corniculatus nodules, to produce different PHA monomers. Among our strains, we found the production of 3-hydroxybutyrate, 3-hydroxyvalerate, 3-hydroxydodecanoate, and 3-hydroxyhexadecanoate. Most of the PHA-positive strains were phylogenetically related to the species M. jarvisii. However, our findings suggest that the ability to produce different monomers forming PHAs is strain-dependent.
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Affiliation(s)
- Marta Marcos-García
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Salamanca, Spain
| | - Paula García-Fraile
- Mikrobiologický ústav, Akademie věd České republiky, Prague, Czech Republic.
| | - Alena Filipová
- Mikrobiologický ústav, Akademie věd České republiky, Prague, Czech Republic
- Přírodovědecká fakulta, Univerzita Karlova, Prague, Czech Republic
| | - Esther Menéndez
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Universidade de Évora, Évora, Portugal
| | - Pedro F Mateos
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Salamanca, Spain
- Unidad Asociada Universidad de Salamanca-CSIC (IRNASA), Salamanca, Spain
| | - Encarna Velázquez
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Salamanca, Spain
- Unidad Asociada Universidad de Salamanca-CSIC (IRNASA), Salamanca, Spain
| | - Tomáš Cajthaml
- Mikrobiologický ústav, Akademie věd České republiky, Prague, Czech Republic
- Přírodovědecká fakulta, Univerzita Karlova, Prague, Czech Republic
| | - Raúl Rivas
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Salamanca, Spain
- Unidad Asociada Universidad de Salamanca-CSIC (IRNASA), Salamanca, Spain
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52
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Im DK, Yun SH, Jung JY, Lee J, Oh MK. Comparison of metabolite profiling of Ralstonia eutropha H16 phaBCA mutants grown on different carbon sources. KOREAN J CHEM ENG 2017. [DOI: 10.1007/s11814-016-0333-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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53
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Panaitescu DM, Nicolae CA, Frone AN, Chiulan I, Stanescu PO, Draghici C, Iorga M, Mihailescu M. Plasticized poly(3-hydroxybutyrate) with improved melt processing and balanced properties. J Appl Polym Sci 2017. [DOI: 10.1002/app.44810] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Cristian Andi Nicolae
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Adriana Nicoleta Frone
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Ioana Chiulan
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Paul Octavian Stanescu
- Advanced Polymers Materials Group, Politehnica University of Bucharest; 1-7 Polizu Street Bucharest 011061 Romania
| | - Constantin Draghici
- C. D. Nenitescu Organic Chemistry Center of Romanian Academy; 202 B Splaiul Independentei Bucharest 060023 Romania
| | - Michaela Iorga
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Mona Mihailescu
- Physics Department, Faculty of Applied Sciences; Politehnica University of Bucharest; 313 Splaiul Independentei Bucharest 060042 Romania
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Alsafadi D, Al-Mashaqbeh O. A one-stage cultivation process for the production of poly-3-(hydroxybutyrate-co-hydroxyvalerate) from olive mill wastewater by Haloferax mediterranei. N Biotechnol 2017; 34:47-53. [DOI: 10.1016/j.nbt.2016.05.003] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 04/28/2016] [Accepted: 05/10/2016] [Indexed: 11/16/2022]
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55
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Becker J, Wittmann C. Systems metabolic engineering of Escherichia coli for the heterologous production of high value molecules — a veteran at new shores. Curr Opin Biotechnol 2016; 42:178-188. [DOI: 10.1016/j.copbio.2016.05.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 05/19/2016] [Accepted: 05/21/2016] [Indexed: 12/13/2022]
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56
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Li T, Ye J, Shen R, Zong Y, Zhao X, Lou C, Chen GQ. Semirational Approach for Ultrahigh Poly(3-hydroxybutyrate) Accumulation in Escherichia coli by Combining One-Step Library Construction and High-Throughput Screening. ACS Synth Biol 2016; 5:1308-1317. [PMID: 27133230 DOI: 10.1021/acssynbio.6b00083] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
As a product of a multistep enzymatic reaction, accumulation of poly(3-hydroxybutyrate) (PHB) in Escherichia coli (E. coli) can be achieved by overexpression of the PHB synthesis pathway from a native producer involving three genes phbC, phbA, and phbB. Pathway optimization by adjusting expression levels of the three genes can influence properties of the final product. Here, we reported a semirational approach for highly efficient PHB pathway optimization in E. coli based on a phbCAB operon cloned from the native producer Ralstonia entropha (R. entropha). Rationally designed ribosomal binding site (RBS) libraries with defined strengths for each of the three genes were constructed based on high or low copy number plasmids in a one-pot reaction by an oligo-linker mediated assembly (OLMA) method. Strains with desired properties were evaluated and selected by three different methodologies, including visual selection, high-throughput screening, and detailed in-depth analysis. Applying this approach, strains accumulating 0%-92% PHB contents in cell dry weight (CDW) were achieved. PHB with various weight-average molecular weights (Mw) of 2.7-6.8 × 106 were also efficiently produced in relatively high contents. These results suggest that the semirational approach combining library design, construction, and proper screening is an efficient way to optimize PHB and other multienzyme pathways.
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Affiliation(s)
- Teng Li
- MOE
Key Lab of Bioinformatics, Department of Biological Science and Biotechnology,
School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jianwen Ye
- MOE
Key Lab of Bioinformatics, Department of Biological Science and Biotechnology,
School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Rui Shen
- MOE
Key Lab of Bioinformatics, Department of Biological Science and Biotechnology,
School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Yeqing Zong
- Key
Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Xuejin Zhao
- Key
Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Chunbo Lou
- Key
Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Guo-Qiang Chen
- MOE
Key Lab of Bioinformatics, Department of Biological Science and Biotechnology,
School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
- Center
for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China
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Sathiyanarayanan G, Saibaba G, Kiran GS, Yang YH, Selvin J. Marine sponge-associated bacteria as a potential source for polyhydroxyalkanoates. Crit Rev Microbiol 2016; 43:294-312. [DOI: 10.1080/1040841x.2016.1206060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Ganesan Sathiyanarayanan
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
| | - Ganesan Saibaba
- Centre for Pheromone Technology, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli, India
| | - George Seghal Kiran
- Department of Food Science and Technology, Pondicherry University, Kalapet, India
| | - Yung-Hun Yang
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, South Korea
- Microbial Carbohydrate Resource Bank, Konkuk University, Seoul, South Korea
| | - Joseph Selvin
- Department of Microbiology, Pondicherry University, Kalapet, India
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58
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Large-scale bioprocess competitiveness: the potential of dynamic metabolic control in two-stage fermentations. Curr Opin Chem Eng 2016. [DOI: 10.1016/j.coche.2016.09.008] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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59
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Millán M, Segura D, Galindo E, Peña C. Molecular mass of poly-3-hydroxybutyrate (P3HB) produced by Azotobacter vinelandii is determined by the ratio of synthesis and degradation under fixed dissolved oxygen tension. Process Biochem 2016. [DOI: 10.1016/j.procbio.2016.04.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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60
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Bonartsev A, Bonartseva GA, Myshkina VL, Voinova VV, Mahina TK, Zharkova II, Yakovlev SG, Zernov AL, Ivanova EV, Akoulina EA, Kuznetsova ES, Zhuikov VA, Alekseeva SG, Podgorskii VV, Bessonov IV, Kopitsyna MN, Morozov AS, Milanovskiy EY, Tyugay ZN, Bykova GS, Kirpichnikov MP, Shaitan KV. Biosynthesis of poly(3-hydroxybutyrateco-3-hydroxy-4-methylvalerate) by Strain Azotobacter chroococcum 7B. Acta Naturae 2016; 8:77-87. [PMID: 27795846 PMCID: PMC5081702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Indexed: 11/06/2022] Open
Abstract
Production of novel polyhydroxyalkanoates (PHAs), biodegradable polymers for biomedical applications, and biomaterials based on them is a promising trend in modern bioengineering. We studied the ability of an effective strain-producer Azotobacter chroococcum 7B to synthesize not only poly(3-hydroxybutyrate) homopolymer (PHB) and its main copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), but also a novel copolymer, poly(3-hydroxybutyrate-co-3-hydroxy-4-methylvalerate) (PHB4MV). For the biosynthesis of PHB copolymers, we used carboxylic acids as additional carbon sources and monomer precursors in the chain of synthesized copolymers. The main parameters of these polymers' biosynthesis were determined: strain-producer biomass yield, polymer yield, molecular weight and monomer composition of the synthesized polymers, as well as the morphology of A. chroococcum 7B bacterial cells. The physico-chemical properties of the polymers were studied using nuclear magnetic resonance spectroscopy (NMR), differential scanning calorimetry (DSC), contact angle test, and other methods. In vitro biocompatibility of the obtained polymers was investigated using stromal cells isolated from the bone marrow of rats with the XTT cell viability test. The synthesis of the novel copolymer PHB4MV and its chemical composition were demonstrated by NMR spectroscopy: the addition of 4-methylvaleric acid to the culture medium resulted in incorporation of 3-hydroxy-4-methylvalerate (3H4MV) monomers into the PHB polymer chain (0.6 mol%). Despite the low molar content of 3H4MV in the obtained copolymer, its physico-chemical properties were significantly different from those of the PHB homopolymer: it has lower crystallinity and a higher contact angle, i.e. the physico-chemical properties of the PHB4MV copolymer containing only 0.6 mol% of 3H4MV corresponded to a PHBV copolymer with a molar content ranging from 2.5% to 7.8%. In vitro biocompatibility of the obtained PHB4MV copolymer, measured in the XTT test, was not statistically different from the cell growth of PHB and PHBV polymers, which make its use possible in biomedical research and development.
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Affiliation(s)
- A.P. Bonartsev
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., Moscow, 119071, Russia
| | - G. A. Bonartseva
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., Moscow, 119071, Russia
| | - V. L. Myshkina
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., Moscow, 119071, Russia
| | - V. V. Voinova
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
| | - T. K. Mahina
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., Moscow, 119071, Russia
| | - I. I. Zharkova
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
| | - S. G. Yakovlev
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., Moscow, 119071, Russia
| | - A. L. Zernov
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
| | - E. V. Ivanova
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
| | - E. A. Akoulina
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., Moscow, 119071, Russia
| | - E. S. Kuznetsova
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
| | - V. A. Zhuikov
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld. 2 Leninsky Ave., Moscow, 119071, Russia
| | - S. G. Alekseeva
- JSC «Institute of Plastics», Petrovskiy proezd, 35, Moscow, 111024, Russia
| | - V. V. Podgorskii
- Federal scientific-clinical center of physics-chemical medicine, Federal medical-biological agency, Malaya Pirogovskaya str., 1a, Moscow, 119435, Russia
| | - I. V. Bessonov
- Bauman Moscow State Technical University, 5, 2-nd Baumanskaya, Moscow, 105005, Russia
| | - M. N. Kopitsyna
- Bauman Moscow State Technical University, 5, 2-nd Baumanskaya, Moscow, 105005, Russia
| | - A. S. Morozov
- Bauman Moscow State Technical University, 5, 2-nd Baumanskaya, Moscow, 105005, Russia
| | - E. Y. Milanovskiy
- Faculty of Soil Science, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234, Russia
| | - Z. N. Tyugay
- Faculty of Soil Science, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234, Russia
| | - G. S. Bykova
- Faculty of Soil Science, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234, Russia
| | - M. P. Kirpichnikov
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
| | - K. V. Shaitan
- Faculty of Biology, M.V.Lomonosov Moscow State University, Leninskie gory, 1-12, Moscow, 119234 , Russia
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61
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Bonartsev AP, Zharkova II, Yakovlev SG, Myshkina VL, Mahina TK, Voinova VV, Zernov AL, Zhuikov VA, Akoulina EA, Ivanova EV, Kuznetsova ES, Shaitan KV, Bonartseva GA. Biosynthesis of poly(3-hydroxybutyrate) copolymers by Azotobacter chroococcum 7B: A precursor feeding strategy. Prep Biochem Biotechnol 2016; 47:173-184. [PMID: 27215309 DOI: 10.1080/10826068.2016.1188317] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A precursor feeding strategy for effective biopolymer producer strain Azotobacter chroococcum 7B was used to synthesize various poly(3-hydroxybutyrate) (PHB) copolymers. We performed experiments on biosynthesis of PHB copolymers by A. chroococcum 7B using various precursors: sucrose as the primary carbon source, various carboxylic acids and ethylene glycol (EG) derivatives [diethylene glycol (DEG), triethylene glycol (TEG), poly(ethylene glycol) (PEG) 300, PEG 400, PEG 1000] as additional carbon sources. We analyzed strain growth parameters including biomass and polymer yields as well as molecular weight and monomer composition of produced copolymers. We demonstrated that A. chroococcum 7B was able to synthesize copolymers using carboxylic acids with the length less than linear 6C, including poly(3-hydroxybutyrate-co-3-hydroxy-4-methylvalerate) (PHB-4MHV) using Y-shaped 6C 3-methylvaleric acid as precursor as well as EG-containing copolymers: PHB-DEG, PHB-TEG, PHB-PEG, and PHB-HV-PEG copolymers using short-chain PEGs (with n ≤ 9) as precursors. It was shown that use of the additional carbon sources caused inhibition of cell growth, decrease in polymer yields, fall in polymer molecular weight, decrease in 3-hydroxyvalerate content in produced PHB-HV-PEG copolymer, and change in bacterial cells morphology that were depended on the nature of the precursors (carboxylic acids or EG derivatives) and the timing of its addition to the growth medium.
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Affiliation(s)
- A P Bonartsev
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia.,b Faculty of Biology , Moscow State University , Moscow , Russia.,c Department of Maxillofacial and Oral Surgery , Nizhny Novgorod State Medical Academy , Nizhny Novgorod , Russia
| | - I I Zharkova
- b Faculty of Biology , Moscow State University , Moscow , Russia
| | - S G Yakovlev
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia.,c Department of Maxillofacial and Oral Surgery , Nizhny Novgorod State Medical Academy , Nizhny Novgorod , Russia
| | - V L Myshkina
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia
| | - T K Mahina
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia
| | - V V Voinova
- b Faculty of Biology , Moscow State University , Moscow , Russia.,c Department of Maxillofacial and Oral Surgery , Nizhny Novgorod State Medical Academy , Nizhny Novgorod , Russia
| | - A L Zernov
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia.,c Department of Maxillofacial and Oral Surgery , Nizhny Novgorod State Medical Academy , Nizhny Novgorod , Russia
| | - V A Zhuikov
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia.,c Department of Maxillofacial and Oral Surgery , Nizhny Novgorod State Medical Academy , Nizhny Novgorod , Russia
| | - E A Akoulina
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia
| | - E V Ivanova
- b Faculty of Biology , Moscow State University , Moscow , Russia
| | - E S Kuznetsova
- b Faculty of Biology , Moscow State University , Moscow , Russia
| | - K V Shaitan
- b Faculty of Biology , Moscow State University , Moscow , Russia
| | - G A Bonartseva
- a A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow , Russia
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62
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Moorkoth D, Nampoothiri KM. Production and characterization of poly(3-hydroxy butyrate-co-3 hydroxyvalerate) (PHBV) by a novel halotolerant mangrove isolate. BIORESOURCE TECHNOLOGY 2016; 201:253-260. [PMID: 26684174 DOI: 10.1016/j.biortech.2015.11.046] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 11/17/2015] [Accepted: 11/18/2015] [Indexed: 06/05/2023]
Abstract
A halophilic mangrove isolate identified by 16S rRNA sequence as a Bacillus spp. was found to be capable of using a broad range of carbon sources including monosaccharides (glucose and fructose), disaccharides (sucrose), pentoses (xylose and arabinose), various organic acids (acetic acid, propionic acid and octanoic acid) and even the acid pre-treated liquor (APL) of sugarcane trash, a lignocellulosic biomass, for growth and the production of polyhydroxyalkanoates (PHAs) such as poly(3-hydroxybutyrate, P3HB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate, PHBV), and 4-hydroxyhexanoate, 4HHX). The study describes the innate ability of a wild-type culture for PHBV production by both propionate dependent and propionate independent pathways. The biopolymer was extracted and characterized physico-chemically. The PHBV yield from glucose was estimated to be 73% of biomass weight with a high 3-hydroxyvalerate fraction of 48mol%. Thereafter, spherical homogenous PHBV nanoparticles of ∼164nm size were prepared for future applications.
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Affiliation(s)
- Dhanya Moorkoth
- Biotechnology Division, CSIR - National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum, 695 019 Kerala, India
| | - Kesavan Madhavan Nampoothiri
- Biotechnology Division, CSIR - National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum, 695 019 Kerala, India.
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63
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Dürre P, Eikmanns BJ. C1-carbon sources for chemical and fuel production by microbial gas fermentation. Curr Opin Biotechnol 2015; 35:63-72. [DOI: 10.1016/j.copbio.2015.03.008] [Citation(s) in RCA: 164] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 03/06/2015] [Accepted: 03/12/2015] [Indexed: 12/25/2022]
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64
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Singh M, Kumar P, Ray S, Kalia VC. Challenges and Opportunities for Customizing Polyhydroxyalkanoates. Indian J Microbiol 2015; 55:235-49. [PMID: 26063933 DOI: 10.1007/s12088-015-0528-6] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 04/09/2015] [Indexed: 02/01/2023] Open
Abstract
Polyhydroxyalkanoates (PHAs) as an alternative to synthetic plastics have been gaining increasing attention. Being natural in their origin, PHAs are completely biodegradable and eco-friendly. However, consistent efforts to exploit this biopolymer over the last few decades have not been able to pull PHAs out of their nascent stage, inspite of being the favorite of the commercial world. The major limitations are: (1) the high production cost, which is due to the high cost of the feed and (2) poor thermal and mechanical properties of polyhydroxybutyrate (PHB), the most commonly produced PHAs. PHAs have the physicochemical properties which are quite comparable to petroleum based plastics, but PHB being homopolymers are quite brittle, less elastic and have thermal properties which are not suitable for processing them into sturdy products. These properties, including melting point (Tm), glass transition temperature (Tg), elastic modulus, tensile strength, elongation etc. can be improved by varying the monomeric composition and molecular weight. These enhanced characteristics can be achieved by modifications in the types of substrates, feeding strategies, culture conditions and/or genetic manipulations.
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Affiliation(s)
- Mamtesh Singh
- Department of Zoology, Gargi College, University of Delhi, Siri Fort Road, Delhi, 110049 India
| | - Prasun Kumar
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, Delhi, 110007 India
| | - Subhasree Ray
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, Delhi, 110007 India
| | - Vipin C Kalia
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, Delhi, 110007 India
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65
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Tan GYA, Chen CL, Ge L, Li L, Tan SN, Wang JY. Bioconversion of styrene to poly(hydroxyalkanoate) (PHA) by the new bacterial strain Pseudomonas putida NBUS12. Microbes Environ 2015; 30:76-85. [PMID: 25740622 PMCID: PMC4356467 DOI: 10.1264/jsme2.me14138] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Styrene is a toxic pollutant commonly found in waste effluents from plastic processing industries. We herein identified and characterized microorganisms for bioconversion of the organic eco-pollutant styrene into a valuable biopolymer medium-chain-length poly(hydroxyalkanoate) (mcl-PHA). Twelve newly-isolated styrene-degrading Pseudomonads were obtained and partial phaC genes were detected by PCR in these isolates. These isolates assimilated styrene to produce mcl-PHA, forming PHA contents between 0.05±0.00 and 23.10±3.25% cell dry mass (% CDM). The best-performing isolate was identified as Pseudomonas putida NBUS12. A genetic analysis of 16S rDNA and phaZ genes revealed P. putida NBUS12 as a genetically-distinct strain from existing phenotypically-similar bacterial strains. This bacterium achieved a final biomass of 1.28±0.10 g L−1 and PHA content of 32.49±2.40% CDM. The extracted polymer was mainly comprised of 3-hydroxyhexanoate (C6 ), 3-hydroxyoctanoate (C8 ), 3-hydroxydecanoate (C10 ), 3-hydroxydodecanoate (C12 ), and 3-hydroxytetradecanoate (C14 ) monomers at a ratio of 2:42:1257:17:1. These results collectively suggested that P. putida NBUS12 is a promising candidate for the biotechnological conversion of styrene into mcl-PHA.
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Affiliation(s)
- Giin-Yu Amy Tan
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; Division of Environmental and Water Resources Engineering, School of Civil and Environmental Engineering, Nanyang Technological University
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Effects of cascaded vgb promoters on poly(hydroxybutyrate) (PHB) synthesis by recombinant Escherichia coli grown micro-aerobically. Appl Microbiol Biotechnol 2014; 98:10013-21. [DOI: 10.1007/s00253-014-6059-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Revised: 08/23/2014] [Accepted: 08/28/2014] [Indexed: 01/29/2023]
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