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Jeon Y, Jin H, Kong Y, Cha HG, Lee BW, Yu K, Yi B, Kim HT, Joo JC, Yang YH, Lee J, Jung SK, Park SH, Park K. Poly(3-hydroxybutyrate) Degradation by Bacillus infantis sp. Isolated from Soil and Identification of phaZ and bdhA Expressing PHB Depolymerase. J Microbiol Biotechnol 2023; 33:1076-1083. [PMID: 37311705 PMCID: PMC10468675 DOI: 10.4014/jmb.2303.03013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 05/04/2023] [Accepted: 05/22/2023] [Indexed: 06/15/2023]
Abstract
Poly(3-hydroxybutyrate) (PHB) is a biodegradable and biocompatible bioplastic. Effective PHB degradation in nutrient-poor environments is required for industrial and practical applications of PHB. To screen for PHB-degrading strains, PHB double-layer plates were prepared and three new Bacillus infantis species with PHB-degrading ability were isolated from the soil. In addition, phaZ and bdhA of all isolated B. infantis were confirmed using a Bacillus sp. universal primer set and established polymerase chain reaction conditions. To evaluate the effective PHB degradation ability under nutrient-deficient conditions, PHB film degradation was performed in mineral medium, resulting in a PHB degradation rate of 98.71% for B. infantis PD3, which was confirmed in 5 d. Physical changes in the degraded PHB films were analyzed. The decrease in molecular weight due to biodegradation was confirmed using gel permeation chromatography and surface erosion of the PHB film was observed using scanning electron microscopy. To the best of our knowledge, this is the first study on B. infantis showing its excellent PHB degradation ability and is expected to contribute to PHB commercialization and industrial composting.
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Affiliation(s)
- Yubin Jeon
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - HyeJi Jin
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Youjung Kong
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Haeng-Geun Cha
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Byung Wook Lee
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Kyungjae Yu
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Byongson Yi
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Hee Taek Kim
- Department of Food Science and Technology, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Jeong Chan Joo
- Department of Biotechnology, The Catholic University of Korea, Bucheon 14662, Republic of Korea
| | - Yung-Hun Yang
- Department of Biological Engineering, Konkuk University, Seoul 05029, Republic of Korea
| | - Jongbok Lee
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Sang-Kyu Jung
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - See-Hyoung Park
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
| | - Kyungmoon Park
- Department of Biological and Chemical Engineering, Hongik University, Sejong 30016, Republic of Korea
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Stable expression and secretion of polyhydroxybutyrate depolymerase of Paucimonas lemoignei in Escherichia coli. J Microbiol 2008; 46:662-9. [DOI: 10.1007/s12275-008-0283-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2008] [Accepted: 11/26/2008] [Indexed: 11/26/2022]
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Denitrification Activity of a Poly-Hydroxybutirate (PHB) Embedded Soil-Column Reactor and Genomic Study of the Bacterial Community. ACTA ACUST UNITED AC 2005. [DOI: 10.2521/jswtb.41.113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Hiraishi A, Khan ST. Application of polyhydroxyalkanoates for denitrification in water and wastewater treatment. Appl Microbiol Biotechnol 2003; 61:103-9. [PMID: 12655451 DOI: 10.1007/s00253-002-1198-y] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2002] [Revised: 11/05/2002] [Accepted: 11/08/2002] [Indexed: 11/26/2022]
Abstract
Application of polyhydroxyalkanoates (PHAs) and related biodegradable polymers has gained momentum in various areas of biotechnology. A promising application that started appearing in the past decade is the use of PHAs as the solid substrate for denitrification of water and wastewater. This type of denitrification, termed here "solid-phase denitrification", has several advantages over the conventional system supplemented with liquid organic substrate. PHAs serve not only as constant sources of reducing power for denitrification but also as solid matrices favorable for development of microbial films. In addition, in contrast to conventional processes, the use of PHAs has no potential risk of release of dissolved organic carbon with the resultant deterioration of effluent water quality. If the production cost of PHAs can be brought down, its application to the denitrification process will become economically more promising. A number of PHA-degrading denitrifying bacteria have been isolated and characterized from activated sludge and continuous flow-bed reactors for denitrification with PHAs. Most of these isolates have been assigned phylogenetically to members of beta-Proteobacteria, especially those of the family Comamonadaceae. The metabolic and regulatory relationships between PHA degradation and denitrification, and the interactive relationship between PHA-degrading cells and the solid surface structure are important subjects awaiting future studies, which would provide a new insight into our comprehensive understanding of the solid-phase denitrification process.
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Affiliation(s)
- A Hiraishi
- Department of Ecological Engineering, Toyohashi University of Technology, Toyohashi, 441-8580, Toyohashi, Japan.
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Khan ST, Horiba Y, Yamamoto M, Hiraishi A. Members of the family Comamonadaceae as primary poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-degrading denitrifiers in activated sludge as revealed by a polyphasic approach. Appl Environ Microbiol 2002; 68:3206-14. [PMID: 12088996 PMCID: PMC126756 DOI: 10.1128/aem.68.7.3206-3214.2002] [Citation(s) in RCA: 148] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The distribution and phylogenetic affiliations of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)-degrading denitrifying bacteria in activated sludge were studied by a polyphasic approach including culture-independent biomarker and molecular analyses as well as cultivation methods. A total of 23 strains of PHBV-degrading denitrifiers were isolated from activated sludges from different sewage treatment plants. 16S ribosomal DNA (rDNA) sequence comparisons showed that 20 of the isolates were identified as members of the family Comamonadaceae, a major group of beta-Proteobacteria. When the sludges from different plants were acclimated with PHBV under denitrifying conditions in laboratory scale reactors, the nitrate removal rate increased linearly during the first 4 weeks and reached 20 mg NO(3)(-)-N h(-1) g of dry sludge(-1) at the steady state. The bacterial-community change in the laboratory scale sludges during the acclimation was monitored by rRNA-targeted fluorescence in situ hybridization and quinone profiling. Both approaches showed that the population of beta-Proteobacteria in the laboratory sludges increased sharply during acclimation regardless of their origins. 16S rDNA clone libraries were constructed from two different acclimated sludges, and a total of 37 clones from the libraries were phylogenetically analyzed. Most of the 16S rDNA clones were grouped with members of the family Comamonadaceae. The results of our polyphasic approach indicate that beta-Proteobacteria, especially members of the family Comamonadaceae, are primary PHBV-degrading denitrifiers in activated sludge. Our data provide useful information for the development of a new nitrogen removal system with solid biopolymer as an electron donor.
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Affiliation(s)
- Shams Tabrez Khan
- Department of Ecological Engineering, Toyohashi University of Technology, Tenpaku-cho, Toyohashi 441-8580, Japan
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