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KMID : 0880220100480060803
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Journal of Microbiology
2010 Volume.48 No. 6 p.803 ~ p.807
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Characterization of Hyperthermostable Fructose-1,6-Bisphosphatase from Thermococcus onnurineus NA1
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Lee Yeol-Gyun
Chung Young-Ho
Kim Seung-Il
Kang Sung-Gyun
Lee Jung-Hyun
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Abstract
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To understand the physiological functions of thermostable fructose-1,6-bisphosphatase (TNA1-Fbp) from Thermococcus onnurineus NA1, its recombinant enzyme was overexpressed in Escherichia coli, purified, and the enzymatic properties were characterized. The enzyme showed maximal activity for fructose-1,6-bisphosphate at 95°C and pH 8.0 with a half-life (t1/2) of about 8 h. TNA1-Fbp had broad substrate specificities for fructose-1,6-bisphosphate and its analogues including fructose-1-phosphate, glucose-1-phosphate, and phosphoenolpyruvate. In addition, its enzyme activity was increased five-fold by addition of 1 mM Mg2+, while Li+ did not enhance enzymatic activity. TNA1-Fbp activity was inhibited by ATP, ADP, and phosphoenolpyruvate, but AMP up to 100 mM did not have any effect. TNA1-Fbp is currently defined as a class V fructose-1,6-bisphosphatase (FBPase) because it is very similar to FBPase of Thermococcus kodakaraensis KOD1 based on sequence homology. However, this enzyme shows a different range of substrate specificities. These results suggest that TNA1-Fbp can establish new criterion for class V FBPases.
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KEYWORD
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T. onnurineus NA1, thermostability, fructose-1, 6-bisphosphatase, hyperthermophilic, Archaea, fructose-1, 6-bisphosphate
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