51
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Crystal morphologies and enzymatic degradation of melt-crystallized thin films of random copolyesters of (R)-3-hydroxybutyric acid with (R)-3-hydroxyalkanoic acids. Polym Degrad Stab 2002. [DOI: 10.1016/s0141-3910(02)00051-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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52
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Gan Z, Abe H, Doi Y. Biodegradable poly(ethylene succinate) (PES). 2. Crystal morphology of melt-crystallized ultrathin film and its change after enzymatic degradation. Biomacromolecules 2002; 1:713-20. [PMID: 11710202 DOI: 10.1021/bm000055t] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly(ethylene succinate) (PES) ultrathin films with an initial thickness of approximately 100 nm were prepared by the solution cast method on either cover glass or freshly cleaved mica as the substrate. The ultrathin films were then melt-crystallized at a given temperature for a certain period of time. The surface morphologies of these films on the substrates were observed by an atomic force microscope (AFM) and an optical microscope (OM) under ambient conditions. Two different crystal morphologies having fibril-like structure and flat-on lamellar crystals with a certain width were formed, and their growth mechanisms were discussed in association with previous kinetic data. It has been shown that at a higher crystallization temperature such as 85 degrees C (smaller degree of undercooling) the crystal aggregates tend to form lozenge-shaped hedrites which evolved from a single crystal. The enzymatic degradation of PES crystals on the ultrathin films was carried out by using a PHB depolymerase from Pseudomonas stutzeri at room temperature. The crystal morphologies before and after enzymatic degradation were examined by AFM. The lamellar crystals were hydrolyzed into many small fragments, and these fragments had the same thickness as that of the lamellar crystals before enzymatic degradation. The analysis of morphological results for PES lamellar crystals has revealed the existence of many defects on the surface of melt-crystallized lamellar crystals. These defects were preferentially attacked by the enzyme molecules. Hydrolysis starts from the chains folding in crystal defect area and proceeds along the lateral edges, i.e., along the direction perpendicular to the folding chain.
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Affiliation(s)
- Z Gan
- Polymer Chemistry Laboratory, RIKEN Institute, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
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53
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Hakkarainen M. Aliphatic Polyesters: Abiotic and Biotic Degradation and Degradation Products. ADVANCES IN POLYMER SCIENCE 2002. [DOI: 10.1007/3-540-45734-8_4] [Citation(s) in RCA: 191] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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54
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Cho K, Lee J, Xing P. Enzymatic degradation of blends of poly(?-caprolactone) and poly(styrene-co-acrylonitrile) byPseudomonas lipase. J Appl Polym Sci 2001. [DOI: 10.1002/app.10084] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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55
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Yamane H, Terao K, Hiki S, Kawahara Y, Kimura Y, Saito T. Enzymatic degradation of bacterial homo-poly(3-hydroxybutyrate) melt spun fibers. POLYMER 2001. [DOI: 10.1016/s0032-3861(01)00247-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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56
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Murase T, Iwata T, Doi Y. Direct Observation of Enzymatic Degradation Behavior of Poly[(R)-3-hydroxybutyrate] Lamellar Single Crystals by Atomic Force Microscopy. Macromolecules 2001. [DOI: 10.1021/ma001505c] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tomohide Murase
- Polymer Chemistry Laboratory and the RIKEN Group of Japan Science and Technology Corporation, RIKEN Institute, Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Tadahisa Iwata
- Polymer Chemistry Laboratory and the RIKEN Group of Japan Science and Technology Corporation, RIKEN Institute, Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Yoshiharu Doi
- Polymer Chemistry Laboratory and the RIKEN Group of Japan Science and Technology Corporation, RIKEN Institute, Hirosawa, Wako-shi, Saitama 351-0198, Japan
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57
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Jendrossek D. Microbial degradation of polyesters. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2001; 71:293-325. [PMID: 11217416 DOI: 10.1007/3-540-40021-4_10] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Polyesters, such as microbially produced poly[(R)-3-hydroxybutyric acid] [poly(3HB)], other poly[(R)-hydroxyalkanoic acids] [poly(HA)] and related biosynthetic or chemosynthetic polyesters are a class of polymers that have potential applications as thermoplastic elastomers. In contrast to poly(ethylene) and similar polymers with saturated, non-functionalized carbon backbones, poly(HA) can be biodegraded to water, methane, and/or carbon dioxide. This review provides an overview of the microbiology, biochemistry and molecular biology of poly(HA) biodegradation. In particular, the properties of extracellular and intracellular poly(HA) hydrolyzing enzymes [poly(HA) depolymerases] are described.
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Affiliation(s)
- D Jendrossek
- Institut für Mikrobiologie der Universität Stuttgart, Allmandring 31, 70569 Stuttgart, Germany.
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58
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Tsuji H, Ishizaka T. Porous biodegradable polyesters. II. Physical properties, morphology, and enzymatic and alkaline hydrolysis of porous poly(?-caprolactone) films. J Appl Polym Sci 2001. [DOI: 10.1002/app.1333] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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59
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Tsuji H, Miyauchi S. Poly(l-lactide): VI Effects of crystallinity on enzymatic hydrolysis of poly(l-lactide) without free amorphous region. Polym Degrad Stab 2001. [DOI: 10.1016/s0141-3910(00)00191-9] [Citation(s) in RCA: 140] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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60
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Sudesh K, Abe H, Doi Y. Synthesis, structure and properties of polyhydroxyalkanoates: biological polyesters. Prog Polym Sci 2000. [DOI: 10.1016/s0079-6700(00)00035-6] [Citation(s) in RCA: 1569] [Impact Index Per Article: 65.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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61
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Kim MN, Lee AR, Yoon JS, Chin IJ. Biodegradation of poly(3-hydroxybutyrate), Sky-Green® and Mater-Bi® by fungi isolated from soils. Eur Polym J 2000. [DOI: 10.1016/s0014-3057(99)00219-0] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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62
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Hoppert M, Mayer F. Principles of macromolecular organization and cell function in bacteria and archaea. Cell Biochem Biophys 2000; 31:247-84. [PMID: 10736750 DOI: 10.1007/bf02738242] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Structural organization of the cytoplasm by compartmentation is a well established fact for the eukaryotic cell. In prokaryotes, compartmentation is less obvious. Most prokaryotes do not need intracytoplasmic membranes to maintain their vital functions. This review, especially dealing with prokaryotes, will point out that compartmentation in prokaryotes is present, but not only achieved by membranes. Besides membranes, the nucleoid, multienzyme complexes and metabolons, storage granules, and cytoskeletal elements are involved in compartmentation. In this respect, the organization of the cytoplasm of prokaryotes is similar to that in the eukaryotic cell. Compartmentation influences properties of water in cells.
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Affiliation(s)
- M Hoppert
- Abteilung Strukfurelle Mikrobiologie, Georg-August-Universitat, Göttingen, Germany.
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63
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Yoshie N, Nakasato K, Fujiwara M, Kasuya K, Abe H, Doi Y, Inoue Y. Effect of low molecular weight additives on enzymatic degradation of poly(3-hydroxybutyrate). POLYMER 2000. [DOI: 10.1016/s0032-3861(99)00547-9] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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64
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Cho K, Lee J, Kwon K. Hydrolytic degradation behavior of poly(butylene succinate)s with different crystalline morphologies. J Appl Polym Sci 2000. [DOI: 10.1002/1097-4628(20010207)79:6<1025::aid-app50>3.0.co;2-7] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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65
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Cyras VP, V�zquez A, Rozsa C, Fern�ndez NG, Torre L, Kenny JM. Thermal stability of P(HB-co-HV) and its blends with polyalcohols. J Appl Polym Sci 2000. [DOI: 10.1002/1097-4628(20000923)77:13<2889::aid-app11>3.0.co;2-o] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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66
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Iwata T, Doi Y, Kokubu F, Teramachi S. Alkaline Hydrolysis of Solution-Grown Poly[(R)-3-hydroxybutyrate] Single Crystals. Macromolecules 1999. [DOI: 10.1021/ma991248f] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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67
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Solid structure and biodegradation of the compositionally fractionated poly(3-hydroxybutyric acid-co-3-hydroxypropionic acid)s. POLYMER 1999. [DOI: 10.1016/s0032-3861(99)00044-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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68
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69
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Kusaka S, Iwata T, Doi Y. Properties and biodegradability of ultra-high-molecular-weight poly[(R)-hydroxybutyrate] produced by a recombinant Escherichia coli. Int J Biol Macromol 1999; 25:87-94. [PMID: 10416654 DOI: 10.1016/s0141-8130(99)00019-7] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Ultra-high-molecular-weight poly[(R)-3-hydroxybutyrate] (P(3HB)) (Mw = 3-11 x 10(6)) was produced from glucose by a recombinant Escherichia coli XL1-Blue (pSYL105) harboring Ralstonia eutropha H16 polyhydroxyalkanoate (PHA) biosynthesis genes. Morphology of ultra-high-molecular-weight P(3HB) granules in the recombinant cells was studied by transmission electron microscopy. The recombinant E. coli contained several P(3HB) granules within a cell. Freeze-fracture morphology of ultra-high-molecular-weight P(3HB) granules showed the needle-type as that of P(3HB) granules in R. eutropha. Both the P(3HB) granules in wet cells and wet native granules isolated from the recombinant cells proved to be amorphous on the X-ray diffraction patterns. Mechanical properties of ultra-high-molecular-weight P(3HB) films were markedly improved by stretching over 400%, resulting from high crystallinity and highly oriented crystal regions. Biodegradability of the films of ultra-high-molecular-weight P(3HB) was tested with an extracellular polyhydroxybutyrate depolymerase from Alcaligenes faecalis T1. The rate of enzymatic erosion of P(3HB) films was not dependent of the molecular weight but was dependent of the crystallinity. In addition, it is demonstrated that all ultra-high-molecular-weight P(3HB) films were completely degraded at 25 degrees C in a natural river freshwater within 3 weeks.
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Affiliation(s)
- S Kusaka
- Akebono Brake R&D Centre, Ltd., Saitama, Japan
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70
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Abe H, Doi Y. Structural effects on enzymatic degradabilities for poly[(R)-3-hydroxybutyric acid] and its copolymers. Int J Biol Macromol 1999; 25:185-92. [PMID: 10416666 DOI: 10.1016/s0141-8130(99)00033-1] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Poly[(R)-3-hydroxybutyric acid] and its copolymers were prepared by biosynthetic and chemosynthetic methods. The films of polyesters were prepared by both the solution-cast and melt-crystallized techniques. The enzymatic degradation of polyester films was carried out at 37 degrees C in an aqueous solution (pH 7.4) of PHB depolymerase from Alcaligenes faecalis. The rate of enzymatic erosion on the solution-cast films increased markedly with an increase in the fraction of second monomer units up to 10-20 mol% to reach a maximum value followed by a decrease in the erosion rate. Analysis of the water-soluble products liberated during the enzymatic degradation of polyester films showed the formation of a mixture of monomers and oligomers of (R)-3HB and hydroxyalkanoic acids units, suggesting that the active site of PHB depolymerase recognizes at least three monomeric units as substrate for the hydrolysis of ester bonds in a polymer chain. The rate of enzymatic erosion of melt-crystallized polyester films decreased with an increase in crystallinity. PHB depolymerase predominantly hydrolyzed the polymer chains in the amorphous phase and subsequently eroded crystalline phase. In addition, the enzymatic degradation of crystalline phase by PHB depolymerase progressed from the edges of crystalline lamellar stacks. The enzymatic erosion rate of crystalline phase in polyester films decreased with an increase in the lamellar thickness.
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Affiliation(s)
- H Abe
- Polymer Chemistry Laboratory, The Institute of Physical and Chemical Research (RIKEN), Saitama, Japan
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71
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Influence of the morphology and of the supermolecular structure on the enzymatic degradation of bacterial poly(3-hydroxybutyrate). POLYMER 1999. [DOI: 10.1016/s0032-3861(98)00503-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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72
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Renstad R, Karlsson S, Albertsson AC. The influence of processing induced differences in molecular structure on the biological and non-biological degradation of poly (3-hydroxybutyrate-co-3-hydroxyvalerate), P(3-HB-co-3-HV). Polym Degrad Stab 1999. [DOI: 10.1016/s0141-3910(98)00092-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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73
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Focarete ML, Ceccorulli G, Scandola M, Kowalczuk M. Further Evidence of Crystallinity-Induced Biodegradation of Synthetic Atactic Poly(3-hydroxybutyrate) by PHB-Depolymerase A from Pseudomonas lemoignei. Blends of Atactic Poly(3-hydroxybutyrate) with Crystalline Polyesters. Macromolecules 1998. [DOI: 10.1021/ma981115e] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Maria Letizia Focarete
- University of Bologna, Department of Chemistry “G. Ciamician” and Centro di Studio per la Fisica delle Macromolecole del CNR, via Selmi 2, 40126 Bologna, Italy
| | - Giuseppina Ceccorulli
- University of Bologna, Department of Chemistry “G. Ciamician” and Centro di Studio per la Fisica delle Macromolecole del CNR, via Selmi 2, 40126 Bologna, Italy
| | - Mariastella Scandola
- University of Bologna, Department of Chemistry “G. Ciamician” and Centro di Studio per la Fisica delle Macromolecole del CNR, via Selmi 2, 40126 Bologna, Italy
| | - Marek Kowalczuk
- Center for Polymer Chemistry, Polish Academy of Sciences, 41-800 Zabrze, Poland
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74
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Scandola M, Focarete ML, Frisoni G. Simple Kinetic Model for the Heterogeneous Enzymatic Hydrolysis of Natural Poly(3-hydroxybutyrate). Macromolecules 1998. [DOI: 10.1021/ma980137y] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mariastella Scandola
- University of Bologna, Department of Chemistry “G. Ciamician” and Centro di Studio per la Fisica delle Macromolecole del CNR, via Selmi 2, 40126 Bologna, Italy
| | - Maria Letizia Focarete
- University of Bologna, Department of Chemistry “G. Ciamician” and Centro di Studio per la Fisica delle Macromolecole del CNR, via Selmi 2, 40126 Bologna, Italy
| | - Giovanna Frisoni
- University of Bologna, Department of Chemistry “G. Ciamician” and Centro di Studio per la Fisica delle Macromolecole del CNR, via Selmi 2, 40126 Bologna, Italy
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75
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Abe H, Doi Y, Aoki H, Akehata T. Solid-State Structures and Enzymatic Degradabilities for Melt-Crystallized Films of Copolymers of (R)-3-Hydroxybutyric Acid with Different Hydroxyalkanoic Acids. Macromolecules 1998. [DOI: 10.1021/ma971559v] [Citation(s) in RCA: 159] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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76
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Scandola M, Focarete ML, Gazzano M, Matuszowicz A, Sikorska W, Adamus G, Kurcok P, Kowalczuk M, Jedlinski Z. Crystallinity-Induced Biodegradation of Novel [(R,S)-β-Butyrolactone]-b-pivalolactone Copolymers. Macromolecules 1997. [DOI: 10.1021/ma970989i] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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77
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Spyros A, Kimmich R, Briese BH, Jendrossek D. 1H NMR Imaging Study of Enzymatic Degradation in Poly(3-hydroxybutyrate) and Poly(3-hydroxybutyrate-co-3-hydroxyvalerate). Evidence for Preferential Degradation of the Amorphous Phase by PHB Depolymerase B fromPseudomonas lemoignei. Macromolecules 1997. [DOI: 10.1021/ma971193m] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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78
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Kasuya K, Inoue Y, Tanaka T, Akehata T, Iwata T, Fukui T, Doi Y. Biochemical and molecular characterization of the polyhydroxybutyrate depolymerase of Comamonas acidovorans YM1609, isolated from freshwater. Appl Environ Microbiol 1997; 63:4844-52. [PMID: 9406404 PMCID: PMC168810 DOI: 10.1128/aem.63.12.4844-4852.1997] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Comamonas acidovorans YM1609 secreted a polyhydroxybutyrate (PHB) depolymerase into the culture supernatant when it was cultivated on poly(3-hydroxybutyrate) [P(3HB)] or poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] as the sole carbon source. The PHB depolymerase was purified from culture supernatant of C. acidovorans by two chromatographic methods, and its molecular mass was determined as 45,000 Da by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. The enzyme was stable at temperatures below 37 degrees C and at pH values of 6 to 10, and its activity was inhibited by diisopropyl fluorophosphonate. The liquid chromatography analysis of water-soluble products revealed that the primary product of enzymatic hydrolysis of P(3HB) was a dimer of 3-hydroxybutyric acid. Kinetics of enzymatic hydrolysis of P(3HB) film were studied. In addition, a gene encoding the PHB depolymerase was cloned from the C. acidovorans genomic library. The nucleotide sequence of this gene was found to encode a protein of 494 amino acids (M(r), 51,018 Da). Furthermore, by analysis of the N-terminal amino acid sequence of the purified enzyme, the molecular mass of the mature enzyme was calculated to be 48,628 Da. Analysis of the deduced amino acid sequence suggested a domain structure of the protein containing a catalytic domain, fibronectin type III module as linker, and a putative substrate-binding domain. Electron microscopic visualization of the mixture of P(3HB) single crystals and a fusion protein of putative substrate-binding domain with glutathione S-transferase demonstrated that the fusion protein adsorbed strongly and homogeneously to the surfaces of P(3HB) single crystals.
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Affiliation(s)
- K Kasuya
- Department of Bioengineering, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Kanagawa, Japan
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79
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Iwata T, Doi Y, Tanaka T, Akehata T, Shiromo M, Teramachi S. Enzymatic Degradation and Adsorption on Poly[(R)-3-hydroxybutyrate] Single Crystals with Two Types of Extracellular PHB Depolymerases from Comamonas acidovorans YM1609 and Alcaligenes faecalis T1. Macromolecules 1997. [DOI: 10.1021/ma970491g] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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80
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Scandola M, Focarete ML, Adamus G, Sikorska W, Baranowska I, Świerczek S, Gnatowski M, Kowalczuk M, Jedliński Z. Polymer Blends of Natural Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and a Synthetic Atactic Poly(3-hydroxybutyrate). Characterization and Biodegradation Studies. Macromolecules 1997. [DOI: 10.1021/ma961431y] [Citation(s) in RCA: 164] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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81
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Iwata T, Doi Y, Kasuya KI, Inoue Y. Visualization of Enzymatic Degradation of Poly[(R)-3-hydroxybutyrate] Single Crystals by an Extracellular PHB Depolymerase. Macromolecules 1997. [DOI: 10.1021/ma961352m] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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82
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Koyama N, Doi Y. Effects of Solid-State Structures on the Enzymatic Degradability of Bacterial Poly(hydroxyalkanoic acids). Macromolecules 1997. [DOI: 10.1021/ma961195r] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Naoyuki Koyama
- Polymer Chemistry Laboratory and the RIKEN Group of the Research Institute of Innovative Technology for the Earth (RITE), The Institute of Physical and Chemical Research (RIKEN), Hirosawa 2-1, Wako-shi, Saitama 351-01, Japan
| | - Yoshiharu Doi
- Polymer Chemistry Laboratory and the RIKEN Group of the Research Institute of Innovative Technology for the Earth (RITE), The Institute of Physical and Chemical Research (RIKEN), Hirosawa 2-1, Wako-shi, Saitama 351-01, Japan
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83
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Finelli L, Sarti B, Scandola M. Miscibility and Biodegradation Behavior of Melt-Processed Blends of Bacterial Poly(3-Hydroxybutyrate) with Poly(Epichlorohydrin). JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 1997. [DOI: 10.1080/10601329708014931] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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84
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Abe H, Doi Y. Enzymatic and Environmental Degradation of Racemic Poly(3-hydroxybutyric acid)s with Different Stereoregularities. Macromolecules 1996. [DOI: 10.1021/ma960907a] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hideki Abe
- Polymer Chemistry Laboratory, The Institute of Physical and Chemical Research (RIKEN), Hirosawa, Wako-shi, Saitama 351-01, Japan
| | - Yoshiharu Doi
- Polymer Chemistry Laboratory, The Institute of Physical and Chemical Research (RIKEN), Hirosawa, Wako-shi, Saitama 351-01, Japan
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85
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Nobes GAR, Marchessault RH, Chanzy H, Briese BH, Jendrossek D. Splintering of Poly(3-hydroxybutyrate) Single Crystals by PHB-Depolymerase A from Pseudomonas lemoignei. Macromolecules 1996. [DOI: 10.1021/ma961219u] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - H. Chanzy
- CERMAV-CNRS, BP 53, 38041 Grenoble Cedex 9, France
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