期刊
BIOTECHNOLOGY LETTERS
卷 31, 期 7, 页码 1019-1024出版社
SPRINGER
DOI: 10.1007/s10529-009-9967-7
关键词
Alpha-amylase; Dextranase; Fusion enzymes; Sugar processing
资金
- 21C Frontier Microbial Genomics
- Ministry of Science and Technology, Republic of Korea
An artificial fusion protein of Arthrobacter oxydans dextranase and Klebsiella pneumoniae alpha-amylase was constructed and expressed in Escherichia coli. Most of the expressed protein existed as an insoluble fraction, which was solubilized with urea. The purified fusion enzyme electrophoretically migrated as a single protein band; M = 137 kDa, and exhibited activities of both dextranase (10.8 U mg(-1)) and amylase (7.1 U mg(-1)), which were lower than that of reference dextranase (13.3 U mg(-1)) and alpha-amylase (103 U mg(-1)). The fusion enzyme displayed bifunctional enzyme activity at pH 5-7 at 37A degrees C. These attributes potentially make the fusion enzyme more convenient for use in sugar processing than a two-enzyme system.
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