Biochemical properties of L-arabinose isomerase from & IT;Clostridium hylemonae & IT; to produce D-tagatose as a functional sweetener
- Authors
- Tien-Kieu Nguyen; Hong, Moon-Gi; Chang, Pahn-Shick; Lee, Byung-Hoo; Yoo, Sang-Ho
- Issue Date
- 23-Apr-2018
- Publisher
- PUBLIC LIBRARY SCIENCE
- Citation
- PLOS ONE, v.13, no.4
- Journal Title
- PLOS ONE
- Volume
- 13
- Number
- 4
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/3857
- DOI
- 10.1371/journal.pone.0196099
- ISSN
- 1932-6203
- Abstract
- D-Tagatose has gained substantial interest due to its potential functionalities as a sucrose substitute. In this study, the gene araA, encoding L-arabinose isomerase (L-Al) from Clostridium hylemonae (DSM 15053), was cloned and expressed in Escherichia coli BL21 (DE3). This gene consists of 1,506 nucleotides and encodes a protein of 501 amino acid residues with a calculated molecular mass of 56,554 Da. Since L-Al was expressed as an intracellular inclusion body, this enzyme was solubilized with guanidine hydrochloride, refolded, and activated with a descending concentration gradient of urea. The purified enzyme exhibited the greatest activity at 50 degrees C, pH 7-7.5, and required 1 mM of Mg2+ as a cofactor. Notably, the catalytic efficiency (3.69 mM(-1) sec(-1)) of L-Al from C. hylemonae on galactose was significantly greater than that of other previously reported enzymes. The bioconversion yield of D-tagatose using the C. hylemonae L-arabinose isomerase at 60 degrees C reached approximately 46% from 10 mM of D-galactose after 2 h. From these results, it is suggested that the L-arabinose isomerase from C. hylemonae could be utilized as a potential enzyme for D-tagatose production due to its high conversion yield at an industrially competitive temperature.
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