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Yokimiko David,Mary Grace Baylon,Sudheer D. V. N. Pamidimarri,Kei-Anne Baritugo,채철기,김유진,김태완,김민식,나정걸,박시재 한국생물공학회 2017 Biotechnology and Bioprocess Engineering Vol.22 No.2
Coal is one of the major sources of energy, fuel, and other related chemicals. The processes to utilize coal for energy, fuel and other chemicals such as coal combustion, liquefaction, carbonization, and gasification pose a great threat to the environment by emitting toxic particles and CO2 to the atmosphere. Thus, biological beneficiation of coal can be a good strategy to utilize coal with environmental sustainability. Here, we report the screening of microorganisms able to degrade or depolymerize coal. These host strains are potential candidates for the development of biological treatment process of coal. A total of 45 microbial strains were isolated from sludge enriched with coal and were identified based on 16S rRNA sequencing. Four strains of three genera, Cupriavidus sp., Pseudomonas sp., and Alcaligenes sp., were further characterized for their abilities to degrade coal. The degree of coal degradation was analyzed by measuring the increase in absorbance at 450 nm by UV spectroscopy. These microorganisms were also able to increase the pH of the culture media as a response to the acidic nature of coal. Laccase-like activity was also found in these strains when tested for RBBR dye degradation. Since biological degradation of coal through the use of microorganisms is a good alternative to chemical combustion of coal, microbial strains isolated in this study can be potential biological catalysts for coal conversion into valuable chemicals.
미니총설 : 바이오플라스틱 생산 미생물 플랫폼 제작을 위한 대사공학 전략 개발
박시재 ( Si Jae Park ),요키미코데이비드 ( Yokimiko David ),메리그레이스베일런 ( Mary Grace Baylon ),홍순호 ( Soon Ho Hong ),오영훈 ( Young Hoon Oh ),양정은 ( Jung Eun Yang ),최소영 ( So Young Choi ),이승환 ( Seung Hwan Lee ),이상엽 ( Sang 한국공업화학회 2014 공업화학 Vol.25 No.2
환경오염, 기후변화, 고갈되어가는 화석원료에 대한 문제를 해결하기 위해 재생가능한 자원으로부터 케미칼 및 고분자 등의 산업자원을 생산하는 친환경 공정개발에 많은 연구가 진행되고 있다. 최근에 재생가능한 바이오매스로부터 다양한 케미칼 및 고분자 등을 생산하는 바이오리파이너리 공정이 많은 관심을 받고 있으며, 석유화학기반산업을 보완 혹은 대체할 가능성이 매우 높은 친환경공정으로 생각되고 있다. 본 총설에서는 바이오리파이너리 공정에 핵심적인 촉매로 사용되고 있는 재조합 미생물의 개발의 최근 동향을 바이오나일론, 바이오폴리에스터의 생산을 위하여 개발되고 있는 재조합 미생물의 대사공학전략을 중심으로 살펴보고자 한다. As the concerns about environmental problems, climate change and limited fossil resources increase, bio-based production of chemicals and polymers from renewable resources gains much attention as one of the promising solutions to deal with these problems. To solve these problems, much effort has been devoted to the development of sustainable process using renewable resources. Recently, many chemicals and polymers have been synthesized by biorefinery process and these bio-based chemicals and plastics have been suggested as strong candidates to substitute petroleum-based products. In this review, we discuss current advances on the development of metabolically engineered microorganisms for the efficient production of bio-based chemicals and polymers.
이미나,Hee Taek Kim,Seo Young Jo,Luan Luong Chu,Kei-Anne Baritugo,Mary Grace Baylon,JIN WON LEE,Jeong-Geol Na,Lyul Ho Kim,Tae-Wan Kim,CHULHWAN PARK,Soon Ho Hong,Jeong Chan Joo,Si Jae Park 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.1
The production of industrial chemicals from renewable biomass resources is a promising solution to overcome the society’s dependence on petroleum and to mitigate the pollution resulting from petroleum processing. Klebsiella pneumoniae is a nutritionally versatile bacterium with numerous native pathways for the production of wellknown and industrially important platform chemicals derived from various sugars. Genomic sequence analyses have shown that the K. pneumoniae genome has a high similarity with that of Escherichia coli, the most studied organism, which is used in industrial biotechnology processes for fuel and chemical production. Hence, K. pneumoniae can be considered as a promising platform microorganism that can be metabolically engineered for the high-level production of bio-based chemicals. This review highlights the substrate metabolism and the metabolic engineering strategies developed in K. pneumoniae for the production of biobased chemicals.
Advances in the biological treatment of coal for synthetic natural gas and chemicals
Si Jae Park,Jeong-Geol Na,Pamidimarri D.V.N. Sudheer,Yokimiko David,Cheol Gi Chae,You Jin Kim,Mary Grace Baylon,Kei-Anne Baritugo,Tae Wan Kim,Min-Sik Kim 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
Coal, the most primitive fossil fuel, has been exploited for ages, and reserves dictate the economies of many countries. Presently, most energy is generated by direct combustion, raising concerns over global warming. Biological pretreatment of fossil resources and generation of alternative green energy can address the environmental issues associated with global coal utilization. Biological coal treatment can produce industrially important chemicals and bio-methane by employing microorganisms able to depolymerize/degrade coal. This review discusses current advances in microbial coal conversion, such as the efforts made to comprehend microbial processes, significant outputs of coal conversion, principle components responsible for coal conversion, and factors affecting the biological processes to convert coal. Development of these biological processes can be a stepping stone for greener coal; however, integration of multidisciplinary technologies is needed to increase the efficiency of economic coal utilization and production of economically and industrially feasible biomethane.
High-level conversion ofL-lysine into 5-aminovalerate that can be used for nylon 6,5 synthesis
Park, Si Jae,Oh, Young Hoon,Noh, Won,Kim, Hye Young,Shin, Jae Ho,Lee, Eun Gyo,Lee, Seungwoon,David, Yokimiko,Baylon, Mary Grace,Song, Bong Keun,Jegal, Jonggeon,Lee, Sang Yup,Lee, Seung Hwan Wiley (John WileySons) 2014 Biotechnology Journal Vol.9 No.10
<P>L-Lysine is a potential feedstock for the production of bio-based precursors for engineering plastics. In this study, we developed a microbial process for high-level conversion of L-lysine into 5-aminovalerate (5AVA) that can be used as a monomer in nylon 6,5 synthesis. Recombinant Escherichia coli WL3110 strain expressing Pseudomonas putida delta-aminovaleramidase (DavA) and lysine 2-monooxygenase (DavB) was grown to high density in fed-batch culture and used as a whole cell catalyst. High-density E. coli WL3110 expressing DavAB, grown to an optical density at 600 nm (OD600 ) of 30, yielded 36.51 g/L 5AVA from 60 g/L L-lysine in 24 h. Doubling the cell density of E. coli WL3110 improved the conversion yield to 47.96 g/L 5AVA from 60 g/L of L-lysine in 24 h. 5AVA production was further improved by doubling the L-lysine concentration from 60 to 120 g/L. The highest 5AVA titer (90.59 g/L; molar yield 0.942) was obtained from 120 g/L L-lysine by E. coli WL3110 cells grown to OD600 of 60. Finally, nylon 6,5 was synthesized by bulk polymerization of ?-caprolactam and δ-valerolactam prepared from microbially synthesized 5AVA. The hybrid system demonstrated here has promising possibilities for application in the development of industrial bio-nylon production processes.</P>