651
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652
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Babinot J, Guigner JM, Renard E, Langlois V. Poly(3-hydroxyalkanoate)-derived amphiphilic graft copolymers for the design of polymersomes. Chem Commun (Camb) 2012; 48:5364-6. [DOI: 10.1039/c2cc30482a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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653
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Boyandin AN, Prudnikova SV, Filipenko ML, Khrapov EA, Vasil’ev AD, Volova TG. Biodegradation of polyhydroxyalkanoates by soil microbial communities of different structures and detection of PHA degrading microorganisms. APPL BIOCHEM MICRO+ 2011. [DOI: 10.1134/s0003683812010024] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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654
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Chen GQ, Patel MK. Plastics derived from biological sources: present and future: a technical and environmental review. Chem Rev 2011; 112:2082-99. [PMID: 22188473 DOI: 10.1021/cr200162d] [Citation(s) in RCA: 458] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Guo-Qiang Chen
- Department of Biological Sciences and Biotechnology, MOE Key Laboratory Bioinformatics (& System Biology), Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China.
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655
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Examining the feasibility of bulk commodity production in Escherichia coli. Biotechnol Lett 2011; 34:585-96. [PMID: 22160295 DOI: 10.1007/s10529-011-0821-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 11/30/2011] [Indexed: 10/14/2022]
Abstract
Escherichia coli is currently used by many research institutions and companies around the world as a platform organism for the development of bio-based production processes for bulk biochemicals. A given bulk biochemical bioprocess must be economically competitive with current production routes. Ideally the viability of each bioprocess should be evaluated prior to commencing research, both by metabolic network analysis (to determine the maximum theoretical yield of a given biocatalyst) and by techno-economic analysis (TEA; to determine the conditions required to make the bioprocess cost-competitive). However, these steps are rarely performed. Here we examine theoretical yields and review available TEA for bulk biochemical production in E. coli. In addition, we examine fermentation feedstocks and review recent strain engineering approaches to achieve industrially-relevant production, using examples for which TEA has been performed: ethanol, poly-3-hydroxybutyrate, and 1,3-propanediol.
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656
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Biosynthesis and characterization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) from Bacillus cereus FA11 isolated from TNT-contaminated soil. ANN MICROBIOL 2011. [DOI: 10.1007/s13213-011-0386-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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657
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658
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Gao X, Chen JC, Wu Q, Chen GQ. Polyhydroxyalkanoates as a source of chemicals, polymers, and biofuels. Curr Opin Biotechnol 2011; 22:768-74. [DOI: 10.1016/j.copbio.2011.06.005] [Citation(s) in RCA: 202] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2011] [Revised: 06/01/2011] [Accepted: 06/06/2011] [Indexed: 11/24/2022]
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659
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Chee JY, Lau NS, Samian MR, Tsuge T, Sudesh K. Expression of Aeromonas caviae polyhydroxyalkanoate synthase gene in Burkholderia sp. USM (JCM15050) enables the biosynthesis of SCL-MCL PHA from palm oil products. J Appl Microbiol 2011; 112:45-54. [PMID: 22054430 DOI: 10.1111/j.1365-2672.2011.05189.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIMS Burkholderia sp. USM (JCM15050) isolated from oil-polluted wastewater is capable of utilizing palm oil products and glycerol to synthesize poly(3-hydroxybutyrate) [P(3HB)]. To confer the ability to produce polymer containing 3-hydroxyhexanoate (3HHx), plasmid (pBBREE32d13) harbouring the polyhydroxyalkanoate (PHA) synthase gene of Aeromonas caviae (phaC(Ac)) was transformed into this strain. METHODS AND RESULTS The resulting transformant incorporated approximately 1 ± 0·3 mol% of 3HHx in the polymer when crude palm kernel oil (CPKO) or palm kernel acid oil was used as the sole carbon source. In addition, when the transformed strain was cultivated in the mixtures of CPKO and sodium valerate, PHA containing 69 mol% 3HB, 30 mol% 3-hydroxyvalerate and 1 mol% 3HHx monomers was produced. Batch feeding of carbon sources with 0·5% (v/v) CPKO at 0 h and 0·25% (w/v) sodium valerate at 36 h yielded 6 mol% of 3HHx monomer by controlled-feeding strategies. CONCLUSIONS Burkholderia sp. USM (JCM15050) has the metabolic pathways to supply both the short-chain length (SCL) and medium-chain length (MCL) PHA monomers. By transforming the strain with the Aer. caviae PHA synthase with broader substrate specificity, SCL-MCL PHA was produced. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first study demonstrating the ability of transformant Burkholderia to produce P(3HB-co-3HHx) from a single carbon source.
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Affiliation(s)
- J-Y Chee
- Ecobiomaterial Research Laboratory, School of Biological Sciences, Universiti Sains Malaysia, Penang, Malaysia
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660
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Wang Q, Ingram LO, Shanmugam KT. Evolution of D-lactate dehydrogenase activity from glycerol dehydrogenase and its utility for D-lactate production from lignocellulose. Proc Natl Acad Sci U S A 2011; 108:18920-5. [PMID: 22065761 PMCID: PMC3223474 DOI: 10.1073/pnas.1111085108] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Lactic acid, an attractive, renewable chemical for production of biobased plastics (polylactic acid, PLA), is currently commercially produced from food-based sources of sugar. Pure optical isomers of lactate needed for PLA are typically produced by microbial fermentation of sugars at temperatures below 40 °C. Bacillus coagulans produces L(+)-lactate as a primary fermentation product and grows optimally at 50 °C and pH 5, conditions that are optimal for activity of commercial fungal cellulases. This strain was engineered to produce D(-)-lactate by deleting the native ldh (L-lactate dehydrogenase) and alsS (acetolactate synthase) genes to impede anaerobic growth, followed by growth-based selection to isolate suppressor mutants that restored growth. One of these, strain QZ19, produced about 90 g L(-1) of optically pure D(-)-lactic acid from glucose in < 48 h. The new source of D-lactate dehydrogenase (D-LDH) activity was identified as a mutated form of glycerol dehydrogenase (GlyDH; D121N and F245S) that was produced at high levels as a result of a third mutation (insertion sequence). Although the native GlyDH had no detectable activity with pyruvate, the mutated GlyDH had a D-LDH specific activity of 0.8 μmoles min(-1) (mg protein)(-1). By using QZ19 for simultaneous saccharification and fermentation of cellulose to D-lactate (50 °C and pH 5.0), the cellulase usage could be reduced to 1/3 that required for equivalent fermentations by mesophilic lactic acid bacteria. Together, the native B. coagulans and the QZ19 derivative can be used to produce either L(+) or D(-) optical isomers of lactic acid (respectively) at high titers and yields from nonfood carbohydrates.
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Affiliation(s)
- Qingzhao Wang
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611
| | - Lonnie O. Ingram
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611
| | - K. T. Shanmugam
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611
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661
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Hiraishi T, Yamashita K, Sakono M, Nakanishi J, Tan LT, Sudesh K, Abe H, Maeda M. Display of Functionally Active PHB Depolymerase on Escherichia Coli
Cell Surface. Macromol Biosci 2011; 12:218-24. [DOI: 10.1002/mabi.201100273] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 09/09/2011] [Indexed: 11/11/2022]
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662
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Xiao N, Jiao N. Formation of polyhydroxyalkanoate in aerobic anoxygenic phototrophic bacteria and its relationship to carbon source and light availability. Appl Environ Microbiol 2011; 77:7445-50. [PMID: 21908634 PMCID: PMC3209146 DOI: 10.1128/aem.05955-11] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Accepted: 08/30/2011] [Indexed: 11/20/2022] Open
Abstract
Aerobic anoxygenic phototrophic bacteria (AAPB) are unique players in carbon cycling in the ocean. Cellular carbon storage is an important mechanism regulating the nutrition status of AAPB but is not yet well understood. In this paper, six AAPB species (Dinoroseobacter sp. JL1447, Roseobacter denitrificans OCh 114, Roseobacter litoralis OCh 149, Dinoroseobacter shibae DFL 12(T), Labrenzia alexandrii DFL 11(T), and Erythrobacter longus DSMZ 6997) were examined, and all of them demonstrated the ability to form the carbon polymer polyhydroxyalkanoate (PHA) in the cell. The PHA in Dinoroseobacter sp. JL1447 was identified as poly-beta-hydroxybutyrate (PHB) according to evidence from Fourier transform infrared spectroscopy, differential scanning calorimetry, and (1)H nuclear magnetic resonance spectroscopy examinations. Carbon sources turned out to be critical for PHA production in AAPB. Among the eight media tested with Dinoroseobacter sp. JL1447, sodium acetate, giving a PHA production rate of 72%, was the most productive carbon source, followed by glucose, with a 68% PHA production rate. Such PHA production rates are among the highest recorded for all bacteria. The C/N ratio of substrates was verified by the experiments as another key factor in PHA production. In the case of R. denitrificans OCh 114, PHA was not detected when the organism was cultured at C/N ratios of <2 but became apparent at C/N ratios of >3. Light is also important for the formation of PHA in AAPB. In the case of Dinoroseobacter sp. JL1447, up to a one-quarter increase in PHB production was observed when the culture underwent growth in a light-dark cycle compared to growth completely in the dark.
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Affiliation(s)
- Na Xiao
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Nianzhi Jiao
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
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663
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Production of 3-hydroxypropionate homopolymer and poly(3-hydroxypropionate-co-4-hydroxybutyrate) copolymer by recombinant Escherichia coli. Metab Eng 2011; 13:777-85. [DOI: 10.1016/j.ymben.2011.10.002] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 09/09/2011] [Accepted: 10/11/2011] [Indexed: 11/18/2022]
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664
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Cai L, Tan D, Aibaidula G, Dong XR, Chen JC, Tian WD, Chen GQ. Comparative genomics study of polyhydroxyalkanoates (PHA) and ectoine relevant genes from Halomonas sp. TD01 revealed extensive horizontal gene transfer events and co-evolutionary relationships. Microb Cell Fact 2011; 10:88. [PMID: 22040376 PMCID: PMC3227634 DOI: 10.1186/1475-2859-10-88] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Accepted: 11/01/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Halophilic bacteria have shown their significance in industrial production of polyhydroxyalkanoates (PHA) and are gaining more attention for genetic engineering modification. Yet, little information on the genomics and PHA related genes from halophilic bacteria have been disclosed so far. RESULTS The draft genome of moderately halophilic bacterium, Halomonas sp. TD01, a strain of great potential for industrial production of short-chain-length polyhydroxyalkanoates (PHA), was analyzed through computational methods to reveal the osmoregulation mechanism and the evolutionary relationship of the enzymes relevant to PHA and ectoine syntheses. Genes involved in the metabolism of PHA and osmolytes were annotated and studied in silico. Although PHA synthase, depolymerase, regulator/repressor and phasin were all involved in PHA metabolic pathways, they demonstrated different horizontal gene transfer (HGT) events between the genomes of different strains. In contrast, co-occurrence of ectoine genes in the same genome was more frequently observed, and ectoine genes were more likely under coincidental horizontal gene transfer than PHA related genes. In addition, the adjacent organization of the homologues of PHA synthase phaC1 and PHA granule binding protein phaP was conserved in the strain TD01, which was also observed in some halophiles and non-halophiles exclusively from γ-proteobacteria. In contrast to haloarchaea, the proteome of Halomonas sp. TD01 did not show obvious inclination towards acidity relative to non-halophilic Escherichia coli MG1655, which signified that Halomonas sp. TD01 preferred the accumulation of organic osmolytes to ions in order to balance the intracellular osmotic pressure with the environment. CONCLUSIONS The accessibility of genome information would facilitate research on the genetic engineering of halophilic bacteria including Halomonas sp. TD01.
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Affiliation(s)
- Lei Cai
- Department of Biological Sciences and Biotechnology, MOE Key Lab, Bioinformatics (& System Biology), Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
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665
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Zhang X, Agrawal A, San KY. Improving fatty acid production in Escherichia coli through the overexpression of malonyl coA-acyl carrier protein transacylase. Biotechnol Prog 2011; 28:60-5. [PMID: 22038854 DOI: 10.1002/btpr.716] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 07/29/2011] [Indexed: 11/11/2022]
Abstract
The microbial biosynthesis of free fatty acid, which can be used as precursors for the production of fuels or chemicals from renewable carbon sources, has attracted significant attention in recent years. Free fatty acids can be produced by introducing an acyl-carrier protein (ACP) thioesterase (TE) gene into Escherichia coli. The first committed step of fatty acid biosynthesis is the conversion of acetyl-CoA to malonyl-CoA by an adenosine triphosphate (ATP)-dependent acetyl-CoA carboxylase followed by the conversion of malonyl-CoA to malonyl-ACP through the enzyme malonyl CoA-acyl carrier protein transacylase (MCT; FabD). The E. coli fabD gene encoding MCT has been cloned and studied. However, the effect of FabD overexpression in a fatty acid overproducing strain has not been examined. In this study, we examined the effect of FabD overexpression in a fatty acid overproducing strain carrying an acyl-ACP TE. Specifically, the effect of overexpressing a fabD gene from four different organisms on fatty acid production was compared. The strains carrying a fabD gene from E. coli, Streptomyces avermitilis MA-4680, or Streptomyces coelicolor A3(2) improved the free fatty acid production; these three strains produced more free fatty acids, about 11% more, than the control strain. The strain carrying a fabD gene from Clostridium acetobutylicum ATCC 824, however, produced similar quantities of free fatty acids as the control strain. In addition, the three FabD overexpressed strains also have higher fatty acid/glucose yields. The results suggested that FabD overexpression can be used to improve free fatty acid production by increasing the malonyl-ACP availability.
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Affiliation(s)
- Xiujun Zhang
- Department of Bioengineering, Rice University, Houston, TX 77005, USA
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666
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Production of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) by Ralstonia eutropha from soybean oil. N Biotechnol 2011; 28:719-24. [DOI: 10.1016/j.nbt.2011.01.007] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 01/20/2011] [Accepted: 01/26/2011] [Indexed: 11/22/2022]
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667
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668
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Dai S, Xue L, Li Z. Enzymatic Ring-Opening Polymerization of Trimethylene Carbonate with Macrodiol: Synthesis of Block Poly(ester-co-carbonate) for Biomaterial Preparation. ACS Catal 2011. [DOI: 10.1021/cs200407n] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shiyao Dai
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
| | - Liang Xue
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
| | - Zhi Li
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
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669
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Pankova Y, Shchegolikhin A, Iordanskii A, Zhulkina A, Ol’khov A, Zaikov G. The Characterization of Novel Biodegradable Blends Based on Polyhydroxybutyrate. CHEMISTRY & CHEMICAL TECHNOLOGY 2011. [DOI: 10.23939/chcht05.03.333] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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670
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Tan D, Xue YS, Aibaidula G, Chen GQ. Unsterile and continuous production of polyhydroxybutyrate by Halomonas TD01. BIORESOURCE TECHNOLOGY 2011; 102:8130-6. [PMID: 21680179 DOI: 10.1016/j.biortech.2011.05.068] [Citation(s) in RCA: 203] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 05/22/2011] [Accepted: 05/25/2011] [Indexed: 05/19/2023]
Abstract
An unsterile and continuous fermentation process was developed based on a halophilic bacterium termed Halomonas TD01 isolated from a salt lake in Xinjiang, China. The strain reached 80 g/L cell dry weight containing 80% poly(3-hydroxybutyrate) (PHB) on glucose salt medium during a 56 h fed-batch process. In a 14-day open unsterile and continuous process, the cells grew to an average of 40 g/L cell dry weight containing 60% PHB in the first fermentor with glucose salt medium. Continuous pumping of cultures from the first fermentor to the second fermentor containing the nitrogen-deficient glucose salt medium diluted the cells but allowed them to maintain a PHB level of between 65% and 70% of cell dry weight. Glucose to PHB conversions were between 20% and 30% in the first fermentor and above 50% in the second one. This unsterile and continuous fermentation process opens a new area for reducing the cost in polyhydroxyalkanoates production.
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Affiliation(s)
- Dan Tan
- MOE Key Laboratory of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
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671
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Liu F, Jian J, Shen X, Chung A, Chen J, Chen GQ. Metabolic engineering of Aeromonas hydrophila 4AK4 for production of copolymers of 3-hydroxybutyrate and medium-chain-length 3-hydroxyalkanoate. BIORESOURCE TECHNOLOGY 2011; 102:8123-8129. [PMID: 21680176 DOI: 10.1016/j.biortech.2011.05.074] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Revised: 05/24/2011] [Accepted: 05/25/2011] [Indexed: 05/30/2023]
Abstract
A mutant termed Aeromonas hydrophila AKLF was constructed by deleting acetic acid pathway related genes pta and ackA in A. hydrophila 4AK4. Accumulation of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) in A. hydrophila AKLF was increased by 47% from 2.11 to 3.10g/L associated with a reduction on acetic acid formation compared with A. hydrophila 4AK4 when lauric acid was used as carbon resource. A. hydrophila AKLF harboring pVGAB encoding Vitreoscilla hemoglobin, β-ketothiolase and acetoacetyl-CoA reductase was found to produce 85% more PHBHHx compared to its wild type. Expression of plasmid pD(Ec)L(Pp) harboring genes related to fatty acid metabolism in A. hydrophila AKLF led to 63% more PHBHHx production than A. hydrophila 4AK4. Replacing phaC in A. hydrophila AKLF with a mutant phaC2 from Pseudomonas stutzeri 1317 resulted in enhanced production of copolymers of 3-hydroxybutyrate and medium-chain-length 3-hydroxyalkanoates compared to A. hydrophila 4AK4 harboring the mutant phaC2 in the chromosome as control.
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Affiliation(s)
- Feng Liu
- Protein Science Laboratory of the Ministry of Education, Department of Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
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672
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Follonier S, Henes B, Panke S, Zinn M. Putting cells under pressure: A simple and efficient way to enhance the productivity of medium-chain-length polyhydroxyalkanoate in processes with Pseudomonas putida KT2440. Biotechnol Bioeng 2011; 109:451-61. [DOI: 10.1002/bit.23312] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 08/09/2011] [Accepted: 08/12/2011] [Indexed: 11/06/2022]
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673
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Hu D, Chung AL, Wu LP, Zhang X, Wu Q, Chen JC, Chen GQ. Biosynthesis and Characterization of Polyhydroxyalkanoate Block Copolymer P3HB-b-P4HB. Biomacromolecules 2011; 12:3166-73. [DOI: 10.1021/bm200660k] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Die Hu
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Ah-Leum Chung
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Lin-Ping Wu
- Department of Pharmaceutics and Analytical Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Xin Zhang
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Qiong Wu
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jin-Chun Chen
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Guo-Qiang Chen
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
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674
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Riedel SL, Bader J, Brigham CJ, Budde CF, Yusof ZAM, Rha C, Sinskey AJ. Production of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) by Ralstonia eutropha in high cell density palm oil fermentations. Biotechnol Bioeng 2011; 109:74-83. [DOI: 10.1002/bit.23283] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2011] [Revised: 07/06/2011] [Accepted: 07/22/2011] [Indexed: 11/08/2022]
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675
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Chung AL, Jin HL, Huang LJ, Ye HM, Chen JC, Wu Q, Chen GQ. Biosynthesis and characterization of poly(3-hydroxydodecanoate) by β-oxidation inhibited mutant of Pseudomonas entomophila L48. Biomacromolecules 2011; 12:3559-66. [PMID: 21838281 DOI: 10.1021/bm200770m] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A medium-chain-length (MCL) polyhydroxyalkanoates (PHAs) producer Pseudomonas entomophila L48 was investigated for microbial production of 3-hydroxydodecanote homopolymer. Pseudomonas entomophila L48 was found to produce MCL PHA consisting of 3-hydroxyhexanoate (3HHx), 3-hydroxyoctanoate (3HO), 3-hydroxydecanoate (3HD), and 3-hydroxydodecanoate (3HDD) from related carbon sources fatty acids. In this study, some of the genes encoding key enzymes in β-oxidation cycle of P. entomophila such as 3-hydroxyacyl-CoA dehydrogenase, 3-ketoacyl-CoA thiolase, and acetyl-CoA acetyltransferase were deleted to study the relationship between β-oxidation and PHA synthesis in P. entomophila. Among the mutants constructed, P. entomophila LAC26 accumulated over 90 wt % PHA consisting of 99 mol % 3HDD. A fed-batch fermentation process carried out in a 6 L automatic fermentor produced 7.3 g L(-1) PHA consisting of over 97 mol % 3HDD fraction. Properties of MCL PHA were significantly improved along with increasing 3HDD contents. P(2.1 mol % 3HD-co-97.9 mol % 3HDD) produced by P. entomophila LAC25 had the widest temperature range between T(g) and T(m), which were -49.3 and 82.4 °C, respectively, in all MCL PHA reported so far. The new type of PHA also represented high crystallinity caused by side-chain crystallization compared with short side chain PHA. For the first time, P(3HDD) homopolymers were obtained.
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Affiliation(s)
- Ah-Leum Chung
- MOE Key Lab of Protein Sciences, Department of Biological Sciences and Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China
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676
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Zinn M, Durner R, Zinn H, Ren Q, Egli T, Witholt B. Growth and accumulation dynamics of poly(3-hydroxyalkanoate) (PHA) in Pseudomonas putida GPo1 cultivated in continuous culture under transient feed conditions. Biotechnol J 2011; 6:1240-52. [DOI: 10.1002/biot.201100219] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2011] [Revised: 06/10/2011] [Accepted: 06/20/2011] [Indexed: 11/06/2022]
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677
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Satoh Y, Tajima K, Nakamoto S, Xuerong H, Matsushima T, Ohshima T, Kawano S, Erata T, Dairi T, Munekata M. Isolation of a thermotolerant bacterium producing medium-chain-length polyhydroxyalkanoate. J Appl Microbiol 2011; 111:811-7. [PMID: 21714837 DOI: 10.1111/j.1365-2672.2011.05093.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
AIMS The aim of this study was to isolate a thermotolerant micro-organism that produces polyhydroxyalkanoates (PHAs) composed of medium-chain-length (mcl) HA units from a biodiesel fuel (BDF) by-product as a carbon source. METHODS AND RESULTS We successfully isolated a thermotolerant micro-organism, strain SG4502, capable to accumulate mcl-PHA from a BDF by-product as a carbon source at a cultivation temperature of 45°C. The strain could also produce mcl-PHA from acetate, octanoate and dodecanoate as sole carbon sources at cultivation temperatures up to 55°C. Taxonomic studies and 16S rRNA gene sequence analysis revealed that strain SG4502 was phylogenetically affiliated with species of the genus Pseudomonas. This study is the first report of PHA synthesis by a thermotolerant Pseudomonas. CONCLUSIONS A novel thermotolerant bacterium capable to accumulate mcl-PHA from a BDF by-product was successfully isolated. SIGNIFICANCE AND IMPACT OF THE STUDY A major issue regarding industrial production of microbial PHAs is their much higher production cost compared with conventional petrochemical-based plastic materials. Especially significant are the cost of a fermentative substrate and the running cost to maintain a temperature suitable for microbial growth. Thus, strain SG4502, isolated in this study, which assimilates BDF by-product and produces PHA at high temperature, would be very useful for practical application in industry.
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Affiliation(s)
- Y Satoh
- Division of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo, Japan.
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678
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Shchegolikhin AN, Iordanskii AL, Filatova A, Gumargalieva KZ, Fomin SV, Potapov EE. Water transport, FTIR, and morphology characterizations of novel biodegradable blends based on poly(3-hydroxybutyrate). JOURNAL OF POLYMER ENGINEERING 2011. [DOI: 10.1515/polyeng.2011.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This paper focuses on the study of novel blends based on poly(3-hydroxybutyrate) (PHB) and polymers with different hydrophilicity [polyethylene (PELD) and polyamide resin (PA548)]. Polymer blends were produced from five ratios of PHB/PELD in an effort to regulate the resistance to hydrolysis or (bio)degradation through the control of water permeability. The relation between the water transport and morphology (TEM data) shows the impact of polymer component ratio on the regulating water flux in hydrophobic matrix. To elucidate the role of hydrophilicity of the second component in the PHB blends, we studied the PHB/PA blends where PA is the polyamide resin composed of statistical copolymer of hexamethyleneadipinate and ε-caprolactam in ratio 1:1. The complex of techniques including DCS and Fourier Transform Infrared (FTIR)-imaging (on the scale of temperature) indicates an interaction between PHB and PA in the temperature ranges of crystallization and melting. The general approach based on Flory-Huggins equation is presented as a way to choose pairs of compatible or partly compatible polymers. Blending PHB with PA could be a simple and effective method to design new matrices for drug delivery, while the same procedure applied to PHB-PELD system with better resistance again, hydrolysis and lower cost than parental PHB could be used as novel bioerodible packaging materials.
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679
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Chemo-enzymatic synthesis of polyhydroxyalkanoate (PHA) incorporating 2-hydroxybutyrate by wild-type class I PHA synthase from Ralstonia eutropha. Appl Microbiol Biotechnol 2011; 92:509-17. [PMID: 21667085 DOI: 10.1007/s00253-011-3362-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 05/11/2011] [Accepted: 05/17/2011] [Indexed: 10/18/2022]
Abstract
A previously established improved two-phase reaction system has been applied to analyze the substrate specificities and polymerization activities of polyhydroxyalkanoate (PHA) synthases. We first analyzed the substrate specificity of propionate coenzyme A (CoA) transferase and found that 2-hydroxybutyrate (2HB) was converted into its CoA derivative. Then, the synthesis of PHA incorporating 2HB was achieved by a wild-type class I PHA synthase from Ralstonia eutropha. The PHA synthase stereoselectively polymerized (R)-2HB, and the maximal molar ratio of 2HB in the polymer was 9 mol%. The yields and the molecular weights of the products were decreased with the increase of the (R)-2HB concentration in the reaction mixture. The weight-average molecular weight of the polymer incorporating 9 mol% 2HB was 1.00 × 10(5), and a unimodal peak with polydispersity of 3.1 was observed in the GPC chart. Thermal properties of the polymer incorporating 9 mol% 2HB were analyzed by DSC and TG-DTA. T (g), T (m), and T (d) (10%) were observed at -1.1°C, 158.8°C, and 252.7°C, respectively. In general, major components of PHAs are 3-hydroxyalkanoates, and only engineered class II PHA synthases have been reported as enzymes having the ability to polymerize HA with the hydroxyl group at C2 position. Thus, this is the first report to demonstrate that wild-type class I PHA synthase was able to polymerize 2HB.
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680
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Kang Z, Du L, Kang J, Wang Y, Wang Q, Liang Q, Qi Q. Production of succinate and polyhydroxyalkanoate from substrate mixture by metabolically engineered Escherichia coli. BIORESOURCE TECHNOLOGY 2011; 102:6600-6604. [PMID: 21489786 DOI: 10.1016/j.biortech.2011.03.070] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2011] [Revised: 03/19/2011] [Accepted: 03/22/2011] [Indexed: 05/30/2023]
Abstract
The strategic design of this study aimed at producing succinate and polyhydroxyalkanoate (PHA) from substrate mixture of glycerol/glucose and fatty acid in Escherichia coli. To accomplish this, an E. coli KNSP1 strain derived from E. coli LR1110 was constructed by deletions of ptsG, sdhA and pta genes and overexpression of phaC1 from Pseudomonas aeruginosa. Cultivation of E. coli KNSP1 showed that this strain was able to produce 21.07 g/L succinate and 0.54 g/L PHA (5.62 wt.% of cell dry weight) from glycerol and fatty acid mixture. The generated PHA composed of 58.7 mol% 3-hydroxyoctanoate (3HO) and 41.3 mol% 3-hydroxydecanoate (3HD). This strain would be useful for complete utilization of byproducts glycerol and fatty acid of biodiesel production process.
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Affiliation(s)
- Zhen Kang
- State Key Laboratory of Microbial Technology, Life Science School, Shandong University, Jinan 250100, PR China
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681
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Nikodinovic-Runic J, Casey E, Duane GF, Mitic D, Hume AR, Kenny ST, O'Connor KE. Process analysis of the conversion of styrene to biomass and medium chain length polyhydroxyalkanoate in a two-phase bioreactor. Biotechnol Bioeng 2011; 108:2447-55. [DOI: 10.1002/bit.23187] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Revised: 04/04/2011] [Accepted: 04/06/2011] [Indexed: 11/07/2022]
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682
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Dual biosyntheses of poly[(R)-3-hydroxybutyric acid] and silk protein for the fabrication of biofunctional bioplastic. Polym J 2011. [DOI: 10.1038/pj.2011.27] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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683
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Engineering of polyhydroxyalkanoate (PHA) synthase PhaC2Ps of Pseudomonas stutzeri via site-specific mutation for efficient production of PHA copolymers. Appl Microbiol Biotechnol 2011; 91:655-65. [DOI: 10.1007/s00253-011-3274-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 03/21/2011] [Accepted: 03/23/2011] [Indexed: 10/18/2022]
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684
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Continuous production of poly([R]-3-hydroxybutyrate) by Cupriavidus necator in a multistage bioreactor cascade. Appl Microbiol Biotechnol 2011; 91:295-304. [DOI: 10.1007/s00253-011-3260-0] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Revised: 03/17/2011] [Accepted: 03/18/2011] [Indexed: 11/28/2022]
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685
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Peng SW, Guo XY, Shang GG, Li J, Xu XY, You ML, Li P, Chen GQ. An assessment of the risks of carcinogenicity associated with polyhydroxyalkanoates through an analysis of DNA aneuploid and telomerase activity. Biomaterials 2011; 32:2546-55. [DOI: 10.1016/j.biomaterials.2010.12.051] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2010] [Accepted: 12/29/2010] [Indexed: 01/23/2023]
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686
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Gotelli GA, Bonelli P, Abraham GA, Sosnik A. Fast and efficient synthesis of high molecular weight poly(epsilon-caprolactone) diols by microwave-assisted polymer synthesis. J Appl Polym Sci 2011. [DOI: 10.1002/app.33664] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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687
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Matsumoto K, Kobayashi H, Ikeda K, Komanoya T, Fukuoka A, Taguchi S. Chemo-microbial conversion of cellulose into polyhydroxybutyrate through ruthenium-catalyzed hydrolysis of cellulose into glucose. BIORESOURCE TECHNOLOGY 2011; 102:3564-3567. [PMID: 20947345 DOI: 10.1016/j.biortech.2010.09.098] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 09/22/2010] [Accepted: 09/24/2010] [Indexed: 05/30/2023]
Abstract
Cellulose-derived glucose generated using the supported ruthenium catalyst was applied to poly(3-hydroxybutyrate) [P(3HB)] production in recombinant Escherichia coli. By the reaction with the catalyst at 220°C, 15-20 carbon mol% of cellulose was converted into glucose. The hydrolysate also contained byproducts such as fructose, mannose, levoglucosan, oligomeric cellulose, 5-hydroxymethylfurfural (5-HMF), and furfural together with unidentified compounds. Setting the reaction temperature lower (215°C) improved the ratio of glucose to 5-HMF, which was a main inhibiting factor for the cell growth. Indeed, the recombinant E. coli exhibited better performance on the hydrolysate generated at 215°C and accumulated P(3HB) up to 42 wt%, which was the same as the case of the same concentration of analytical grade glucose. The result indicated that the ruthenium-mediated cellulose hydrolysis has a potency as a useful biorefinery process for production of bio-based plastic from cellulosic biomass.
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Affiliation(s)
- Ken'ichiro Matsumoto
- Division of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo, Japan
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688
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Lau NS, Tsuge T, Sudesh K. Formation of new polyhydroxyalkanoate containing 3-hydroxy-4-methylvalerate monomer in Burkholderia sp. Appl Microbiol Biotechnol 2011; 89:1599-609. [DOI: 10.1007/s00253-011-3097-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 11/18/2010] [Accepted: 11/24/2010] [Indexed: 11/24/2022]
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689
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Sznajder A, Jendrossek D. Biochemical characterization of a new type of intracellular PHB depolymerase from Rhodospirillum rubrum with high hydrolytic activity on native PHB granules. Appl Microbiol Biotechnol 2011; 89:1487-95. [DOI: 10.1007/s00253-011-3096-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Revised: 11/04/2010] [Accepted: 11/05/2010] [Indexed: 11/29/2022]
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690
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Disruption of β-oxidation pathway in Pseudomonas putida KT2442 to produce new functionalized PHAs with thioester groups. Appl Microbiol Biotechnol 2011; 89:1583-98. [DOI: 10.1007/s00253-011-3099-4] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 12/31/2010] [Accepted: 01/02/2011] [Indexed: 10/18/2022]
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691
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Wei YH, Chen WC, Huang CK, Wu HS, Sun YM, Lo CW, Janarthanan OM. Screening and evaluation of polyhydroxybutyrate-producing strains from indigenous isolate Cupriavidus taiwanensis strains. Int J Mol Sci 2011; 12:252-65. [PMID: 21339985 PMCID: PMC3039951 DOI: 10.3390/ijms12010252] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2010] [Revised: 12/26/2010] [Accepted: 01/01/2011] [Indexed: 01/05/2023] Open
Abstract
Polyhydroxyalkanoate (PHA) is a biodegradable material with many potential biomedical applications, including medical implants and drug delivery. This study developed a system for screening production strains in order to optimize PHA production in Cupriavidus taiwanensis 184, 185, 186, 187, 204, 208, 209 and Pseudomona oleovorans ATCC 29347. In this study, Sudan black B staining, Infrared (IR) and Gas Chromatography (GC) analysis indicated that the best strain for PHA synthesis is C. taiwanensis 184, which obtains polyhydroxybutyrate (PHB). Cultivation of C. taiwanensis 184 under a pH of 7.0, at 30 °C, and at an agitation rate of 200 rpm, obtained a PHB content of 10% and PHB production of 0.14 g/L. The carbon and nitrogen types selected for analysis of PHB production by C. taiwanensis 184 were gluconic acid and NH4Cl, respectively. Optimal carbon/nitrogen ratio for PHB production was also determined. This study demonstrated a PHB content of 58.81% and a PHB production of 2.44 g/L when the carbon/nitrogen ratio of 8/1 was selected for C. taiwanensis 184. A two-stage fermentation strategy significantly enhanced PHB content and PHB production. Under a two-stage fermentation strategy with nutrient-limited conditions, C. taiwanensis 184 obtained a PHB content of 72% and a PHB concentration of 7 g/L. Finally, experimental results confirmed that optimizing the growth medium and fermentation conditions for cultivating the indigenous C. taiwanensis 184 strain substantially elevated PHB content from 10% to 72% and PHB production from 0.14 g/L to 7 g/L, respectively.
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Affiliation(s)
- Yu-Hong Wei
- Graduate School of Biotechnology and Bioengineering, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (W.-C.C.); (C.-K.H.); (O.-M.J.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +886-3-4638800; Fax: +886-3-4334667
| | - Wei-Chuan Chen
- Graduate School of Biotechnology and Bioengineering, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (W.-C.C.); (C.-K.H.); (O.-M.J.)
| | - Chin-Kuei Huang
- Graduate School of Biotechnology and Bioengineering, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (W.-C.C.); (C.-K.H.); (O.-M.J.)
| | - Ho-Shing Wu
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (H.-S.W.); (Y.-M.S.); (C.-W.L.)
| | - Yi-Ming Sun
- Graduate School of Biotechnology and Bioengineering, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (W.-C.C.); (C.-K.H.); (O.-M.J.)
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (H.-S.W.); (Y.-M.S.); (C.-W.L.)
| | - Chi-Wei Lo
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (H.-S.W.); (Y.-M.S.); (C.-W.L.)
| | - Om-Murugan Janarthanan
- Graduate School of Biotechnology and Bioengineering, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan; E-Mails: (W.-C.C.); (C.-K.H.); (O.-M.J.)
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692
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Efficient production of polylactic acid and its copolymers by metabolically engineered Escherichia coli. J Biotechnol 2011; 151:94-101. [DOI: 10.1016/j.jbiotec.2010.11.009] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2010] [Revised: 11/10/2010] [Accepted: 11/15/2010] [Indexed: 11/22/2022]
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693
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Model-based Dynamic Optimisation of Microbial Processes for the High-Yield Production of Biopolymers with Tailor-made Molecular Properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/b978-0-444-54298-4.50059-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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694
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MATSUMOTO K. Production of Polyhydroxyalkanoate Copolymers in Transgenic Plants Expressing Engineered Enzymes. KOBUNSHI RONBUNSHU 2011. [DOI: 10.1295/koron.68.562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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695
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Zhu JL, Liu KL, Zhang Z, Zhang XZ, Li J. Amphiphilic star-block copolymers and supramolecular transformation of nanogel-like micelles to nanovesicles. Chem Commun (Camb) 2011; 47:12849-51. [DOI: 10.1039/c1cc15965h] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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696
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Screening for polyhydroxyalkanoate (PHA)-producing bacterial strains and comparison of PHA production from various inexpensive carbon sources. ANN MICROBIOL 2010. [DOI: 10.1007/s13213-010-0181-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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697
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You M, Peng G, Li J, Ma P, Wang Z, Shu W, Peng S, Chen GQ. Chondrogenic differentiation of human bone marrow mesenchymal stem cells on polyhydroxyalkanoate (PHA) scaffolds coated with PHA granule binding protein PhaP fused with RGD peptide. Biomaterials 2010; 32:2305-13. [PMID: 21190731 DOI: 10.1016/j.biomaterials.2010.12.009] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Accepted: 12/04/2010] [Indexed: 12/13/2022]
Abstract
Hydrophobic polyhydroxyalkanoate (PHA) scaffolds made of a copolyester of 3-hydroxybutyrate-co-hydroxyhexanoate (PHBHHx) were coated with a fusion protein PHA granule binding protein PhaP fused with RGD peptide (PhaP-RGD). Human bone marrow mesenchymal stem cells (hBMSCs) were inoculated on/in the scaffolds for formation of articular cartilages derived from chondrogenic differentiation of hBMSCs for cartilage tissue engineering. PhaP-RGD coating led to more homogeneous spread of cells, better cell adhesion, proliferation and chondrogenic differentiation in the scaffolds compared with those of PhaP coated or uncoated scaffolds immerging in serum minus chondrogenic induction medium. In addition, more extracellular matrices were produced by the differentiated cells over a period of 14 days on/in the PhaP-RGD coated scaffolds evidenced by scanning electron microscopy imaging, enhanced expression of chondrocyte specific genes including SOX-9, aggrecan and type II collagen, suggesting the positive effect of RGD on extracellular matrix production. Furthermore, cartilage-specific extracellular substances sulphated glycosaminoglycans (sGAG) and total collagen content found on/in the PhaP-RGD coated scaffolds were significantly more compared with that produced by the control and PhaP only coated scaffolds. Homogeneously distributed chondrocytes-like cells forming cartilage-like matrices were observed on/in the PhaP-RGD coated scaffolds after 3 weeks. The results suggested that PhaP-RGD coated PHBHHx scaffold promoted chondrogenic differentiation of hBMSCs and could support cartilage tissue engineering.
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Affiliation(s)
- Mingliang You
- Multidisciplinary Research Center, Shantou University, Shantou 515063, Guangdong, China
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698
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Microbial production of polyhydroxyalkanoate block copolymer by recombinant Pseudomonas putida. Appl Microbiol Biotechnol 2010; 90:659-69. [PMID: 21181145 DOI: 10.1007/s00253-010-3069-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Revised: 12/07/2010] [Accepted: 12/07/2010] [Indexed: 10/18/2022]
Abstract
Polyhydroxyalkanoate (PHA) synthesis genes phaPCJ(Ac) cloned from Aeromonas caviae were transformed into Pseudomonas putida KTOY06ΔC, a mutant of P. putida KT2442, resulting in the ability of the recombinant P. putida KTOY06ΔC (phaPCJ(A.c)) to produce a short-chain-length and medium-chain-length PHA block copolymer consisting of poly-3-hydroxybutyrate (PHB) as one block and random copolymer of 3-hydroxyvalerate (3HV) and 3-hydroxyheptanoate (3HHp) as another block. The novel block polymer was studied by differential scanning calorimetry (DSC), nuclear magnetic resonance, and rheology measurements. DSC studies showed the polymer to possess two glass transition temperatures (T(g)), one melting temperature (T(m)) and one cool crystallization temperature (T(c)). Rheology studies clearly indicated a polymer chain re-arrangement in the copolymer; these studies confirmed the polymer to be a block copolymer, with over 70 mol% homopolymer (PHB) of 3-hydroxybutyrate (3HB) as one block and around 30 mol% random copolymers of 3HV and 3HHp as the second block. The block copolymer was shown to have the highest tensile strength and Young's modulus compared with a random copolymer with similar ratio and a blend of homopolymers PHB and PHVHHp with similar ratio. Compared with other commercially available PHA including PHB, PHBV, PHBHHx, and P3HB4HB, the short-chain- and medium-chain-length block copolymer PHB-b-PHVHHp showed differences in terms of mechanical properties and should draw more attentions from the PHA research community.
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699
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Guillaume C, Ajellal N, Carpentier JF, Guillaume SM. Boron-functionalized poly(3-hydroxybutyrate)s from hydroboration of poly(allyl-β-hydroxyalkanoate)s: Synthesis and insights into the microstructure. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24502] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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700
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Biodegradation of polyhydroxyalkanoates (PHAs) in tropical coastal waters and identification of PHA-degrading bacteria. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2010.08.023] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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