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Engineered dextranase from Streptococcus mutans enhances the production of longer isomaltooligosaccharides

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Title: Engineered dextranase from Streptococcus mutans enhances the production of longer isomaltooligosaccharides
Authors: Klahan, Patcharapa Browse this author
Okuyama, Masayuki Browse this author →KAKEN DB
Jinnai, Kohei Browse this author
Ma, Min Browse this author
Kikuchi, Asako Browse this author
Kumagai, Yuya Browse this author →KAKEN DB
Tagami, Takayoshi Browse this author
Kimura, Atsuo Browse this author →KAKEN DB
Keywords: Glycoside hydrolase family 66
bond cleavage frequency
Issue Date: Sep-2018
Publisher: Taylor & Francis
Journal Title: Bioscience biotechnology and biochemistry
Volume: 82
Issue: 9
Start Page: 1480
End Page: 1487
Publisher DOI: 10.1080/09168451.2018.1473026
PMID: 29806555
Abstract: Herein, we investigated enzymatic properties and reaction specificities of Streptococcus mutans dextranase, which hydrolyzes α-(1→6)-glucosidic linkages in dextran to produce isomaltooligosaccharides. Reaction specificities of wild-type dextranase and its mutant derivatives were examined using dextran and a series of enzymatically prepared p-nitrophenyl α-isomaltooligosaccharides. In experiments with 4-mg·mL⁻¹ dextran, isomaltooligosaccharides with degrees of polymerization (DP) of 3 and 4 were present at the beginning of the reaction, and glucose and isomaltose were produced by the end of the reaction. Increased concentrations of the substrate dextran (40 mg·mL⁻¹) yielded isomaltooligosaccharides with higher DP, and the mutations T558H, W279A/T563N, and W279F/T563N at the -3 and -4 subsites affected hydrolytic activities of the enzyme, likely reflecting decreases in substrate affinity at the -4 subsite. In particular, T558H increased the proportion of isomaltooligosaccharide with DP of 5 in hydrolysates following reactions with 4-mg·mL⁻¹ dextran.Abbreviations CI: cycloisomaltooligosaccharide; CITase: CI glucanotransferase; CITase-Bc: CITase from Bacillus circulans T-3040; DP: degree of polymerization of glucose unit; GH: glycoside hydrolase family; GTF: glucansucrase; HPAEC-PAD: high performance anion-exchange chromatography-pulsed amperometric detection; IG: isomaltooligosaccharide; IGn: IG with DP of n (n, 2‒5); PNP: p-nitrophenol; PNP-Glc: p-nitrophenyl α-glucoside; PNP-IG: p-nitrophenyl isomaltooligosaccharide; PNP-IGn: PNP-IG with DP of n (n, 2‒6); SmDex: dextranase from Streptococcus mutans; SmDexTM: S. mutans ATCC25175 SmDex bearing Gln100‒Ile732.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Bioscience biotechnology and biochemistry on 26/05/2018, available online:
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 奥山 正幸

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