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KMID : 1007520160250061665
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Food Science and Biotechnology
2016 Volume.25 No. 6 p.1665 ~ p.1669
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Broad substrate specificity of a hyperthermophilic α-glucosidase from Pyrobaculum arsenaticum
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Jung Jong-Hyun
Seo Dong-Ho
Holden James F.
Kim Hyun-Seok
Baik Moo-Yeol
Park Cheon-Seok
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Abstract
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Pyrobaculum arsenaticum is a hyperthermophilic archaeon that thrives at 95°C. This strain encodes a putative GH31 intracellular α-glucosidase (Pars_2044, PyAG) in its genome. The recombinant PyAG (rPyAG) was optimally expressed in Escherichia coli at 37°C for 4 h after IPTG induction. The purified rPyAG is a homotetrameric α-glucosidase that exhibited highly thermostable properties. Maximum p-nitrophenyl-α-D-glucopyranoside (pNPG) hydrolysis activity was observed at 90°C and pH 5.0. The enzyme mainly recognized the non-reducing end of the substrate, releasing the glucose unit. rPyAG also had broad substrate specificity, cleaving maltose (α-1,4-linkage), kojibiose (α-1,2-linkage), and nigerose (α-1,3-linkage) with similar efficiency. Based on these results, rPyAG can be used to modify health-relevant sugar conjugates linked by α-1,2- or α-1,3-bonds.
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KEYWORD
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α-glucosidase, glycoside hydrolase family 31, hyperthermophile, Pyrobaculum arsenaticum
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