Properties and Substrate Specificity of a-Glucosidase from Aspergillus niger GRM 3
-
- KIMURA Atsuo
- Department of Applied Bioscience, Faculty of Agriculture, Hokkaido University
-
- TAKENISHI Shigeyuki
- Osaka Municipal Technical Research Institute
-
- TAKATA Masuhiro
- Department of Applied Bioscience, Faculty of Agriculture, Hokkaido University
-
- TSUJISAKA Yoshio
- Hayashibara Institute Corp.
-
- CHIBA Seiya
- Department of Applied Bioscience, Faculty of Agriculture, Hokkaido University
Bibliographic Information
- Other Title
-
- α-グルコシダーゼの諸性質と基質特異性
Abstract
Aspergillus niger α-glucosidase was crystallized by acetone addition after ammonium sulfate fractionation and chromatographies on DEAE-Sepharose CL-6B and Bio-Gel P-150 (1st and 2nd) columns. The crystalline α-glucosidase, which was a glycoprotein containing 27% carbohydrate as glucose, gave a single band on polyacrylamide disc gel electrophoresis. The molecular weight was estimated to be about 12.0 × 104 by SDS-polyacrylamide disc gel electrophoresis. However, the enzyme consisted of two components (Mr, 4.2 × 104 and 9.0 × 104 ) separable by reversed-phase HPLC causing irreversible inactivation. Their N-terminal sequences were analyzed to be LXPAPSQ and SQDYISL. The optimum pH was 4.5. In the initial reaction stage, phenyl α-maltoside was cleaved into α-glucose and phenyl α-glucoside. The ratios of the maximum velocities (Km values, in parentheses, mM of nonreducing terminal) for maltose, malto-triose, -tetraose, -pentaose, -hexaose, -heptaose and -octaose, maltodextrin (DP= 17), kojibiose, nigerose, isomaltose, phenyl α-glucoside, phenyl α-maltoside, panose and soluble starch were estimated to be 100 (1.30), 122 (1.20), 105 (1.32), 106 (2.09), 108 (3.85), 107 (5.64), 107 (6.02), 103 (20.8), 34.4 (6.76), 78.5 (20.0), 45.4 (9.80), 9.42 (1.82), 110 (1.49), 41.1 (4.88) and 111 (7.14), respectively. The enzyme also hydrolyzed α-glucans such as soluble starch, however, the rates of cleavage were very slow.
Journal
-
- Journal of Applied Glycoscience
-
Journal of Applied Glycoscience 44 (3), 303-312, 1997
The Japanese Society of Applied Glycoscience
- Tweet
Details 詳細情報について
-
- CRID
- 1390282680146916864
-
- NII Article ID
- 130004257534
-
- COI
- 1:CAS:528:DyaK2sXmsVWjs7c%3D
-
- ISSN
- 18844898
- 13403494
-
- Data Source
-
- JaLC
- CiNii Articles
-
- Abstract License Flag
- Disallowed