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Substrate specificities of alpha-galactosidases from yeasts
S Yoshida1, C H Tan, T Shimokawa
1Institute of Applied Biochemistry, University of Tsukuba, Japan.
Bioscience, Biotechnology, and Biochemistry
|February 1, 1997
Summary
Researchers screened yeast strains for alpha-galactosidase production, finding some produced both intracellular and extracellular enzymes. These enzymes effectively hydrolyzed specific galactose-containing oligosaccharides, indicating potential applications in carbohydrate processing.
Area of Science:
- Enzymology and Microbial Biotechnology
- Carbohydrate Chemistry
Background:
- Yeasts capable of metabolizing galactose, melibiose, and raffinose are potential sources of alpha-galactosidase.
- Alpha-galactosidases are crucial enzymes for breaking down alpha-galactosidic linkages in various complex carbohydrates.
Purpose of the Study:
- To screen yeast strains for alpha-galactosidase activity.
- To characterize the substrate specificity of the produced alpha-galactosidases.
Main Methods:
- Screening of 29 yeast strains for alpha-galactosidase production.
- Enzyme characterization using specific substrates: 6(3)-alpha-D-galactosyl-1,4-beta-D-mannotriose and 6(3)-alpha-D-galactosyl-1,4-beta-D-mannotetraose.
Main Results:
- Seven out of 29 screened yeast strains exhibited alpha-galactosidase activity.
- Five strains produced both intracellular and extracellular alpha-galactosidases; two produced only intracellular enzyme.
- All characterized enzymes successfully cleaved terminal galactose from 6(3)-alpha-D-galactosyl-1,4-beta-D-mannotriose but not internal galactose from 6(3)-alpha-D-galactosyl-1,4-beta-D-mannotetraose.
Conclusions:
- The study identified yeast strains producing alpha-galactosidases with specific substrate hydrolysis capabilities.
- These enzymes demonstrate potential for targeted applications in the breakdown of specific alpha-galactosyl-oligosaccharides.