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- Title
- Novel α-glucosidase from extreme thermophile Thermus caldophilus GK24
- Author(s)
- Oyekanmi Nashiru; Suk Hoon Koh; Se Yong Lee; Dae Sil Lee
- Bibliographic Citation
- BMB Reports, vol. 34, no. 4, pp. 347-354
- Publication Year
- 2001
- Abstract
- α-Glucosidase of an extreme thermophile, Thermus caldophilus GK24 (TcaAG), was purified 80-fold from cells to a homogeneous state and characterized. The enzyme exhibited optimum activity at pH 6.5 and 90°C, and was stable from pH 6.0 to 8.5 and up to 90°C. The enzyme had a half-life of 85 minutes at 90°C. An analysis of the substrate specificity showed that the enzyme hydrolyzed the non-reducing terminal unit of α-1,6-glucosidic linkages of isomaltosaccharides and panose, α-1,3-glycosidic bond of nigerose and turanose, and α-1,2-glycosidic bond of sucrose. The gene encoding the TcaAG was cloned, sequenced, and expressed in E. coli. The nucleotide sequence of the gene encoded a 530 amino acid polypeptide and had a G+C content of 68.4% with a strong bias for G or C in the third position of the codons (93.6%). A sequence analysis revealed that TcaAG belonged to the α-amylase family. We suggest that this monomeric, thermostable, and broad-acting α-glucosidase is a departure from previously exhibited specificities. It is, therefore, a novel α-glucosidase.
- Keyword
- α-GlucosidaseGene cloningThermostable enzymeThermus spTransglucosylation
- ISSN
- 1225-8687
- Publisher
- Korea Soc-Assoc-Inst
- Type
- Article
- Appears in Collections:
- 1. Journal Articles > Journal Articles
- Files in This Item:
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