Gene cloning and enzymatic properties of hyperthermostable β-glycosidase from Thermus thermophilus HJ6(ENZYMOLOGY, PROTEIN ENGINEERING, AND ENZYME TECHNOLOGY)
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概要
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A microorganism (strain HJ6) producing extracellular β-glycosidase was isolated from a hot springs located in Arima-cho, Hyogo, Japan. The cells were long-rods (2-4μm) about 0.4μm in diameter, and formed yellow-colored colonies, like most other strains of the genus Thermus. The pH and temperature for optimal growth were 6.5 and 80℃. Thus, the HJ6 strain displayed a higher optimal temperature than other described Thermus sp. The gene encoding β-glycosidase (TtβGly) was cloned, sequenced, and comprised of 1296 nucleotides encoding a protein (431 amino acids) with a predicted molecular mass of 48.7kDa. TtβGly was expressed in Escherichia coll cells, and the recombinant protein was purified to homogeneity. The optimal temperature and pH for β-glycosidase activity were found to be 90℃ and 8.5, respectively. The half-life of heat inactivation was about 30min at 95℃ indicating that TtβGly had higher thermostability than β-glycosidases from other Thermus sp. The results of the kinetics experiment indicated that β-D-fucoside and β-D-glucoside were better substrates of TtβGly than β-D-galactoside. The catalytic efficiency (k_<cat>/K_m) of TtβGly at 80℃ increased 70-fold to that at 40℃, indicating that this enzyme was activated at high temperatures. Thin layer chromatography showed that the enzyme had transglycosylation activity at high temperature and that various transfer products were formed in the reaction with lactose or cellobiose.
著者
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KIM Hyun
Department of Internal Medicine, Chonnam National University Hospital
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Gu Na
Department of Biomaterial Control (Brain Korea 21 Program), Don-Eui University
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Kim Jung-Lim
Department of Biotechnology & Bioengineering, Dong-Eui University
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You Dong
Department of Material and Life Science, Graduate School of Engineering, Osaka University
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Kim Han-Woo
Research Institute of Cell Engineering, National Institute of Advanced Industrial Science and Techno
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Jeon Sung
Department of Biomaterial Control (Brain Korea 21 Program), Don-Eui University
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You Dong
Department Of Material And Life Science Graduate School Of Engineering Osaka University
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Kim Han-woo
Research Institute Of Cell Engineering National Institute Of Advanced Industrial Science And Technol
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Jeon Sung
Department Of Biomaterial Control (brain Korea 21 Program) Don-eui University:department Of Biotechn
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Gu Na
Department Of Biomaterial Control (brain Korea 21 Program) Don-eui University
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Kim Jung-lim
Department Of Biotechnology & Bioengineering Dong-eui University
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Kim Hyun-jung
Department Of Anatomy School Of Medicine Pusan National University
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Kim Hyun
Department Of Agricultural Biotechnology And Center For Agricultural Biomaterials Seoul National Uni
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Kim Hyun
Department Of Biomaterial Control (brain Korea 21 Program) Don-eui University
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Kim Hyun
Department Of Agricultural Bio-resources National Academy Of Agricultural Science Rural Development
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Gu Na-Yeon
Department of Biomaterial Control (Brain Korea 21 Program), Don-Eui University
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YOU Dong
Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology
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