Extracellular alpha-galactosidase from Debaryomyces hansenii UFV-1 and its use in the hydrolysis of raffinose oligosaccharides. 2006

Pollyanna A Viana, and Sebastião T de Rezende, and Virgínia M Marques, and Larissa M Trevizano, and Flávia M L Passos, and Maria G A Oliveira, and Marcelo P Bemquerer, and Jamil S Oliveira, and Valéria M Guimarães
BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, 36570-000, Brazil.

Raffinose oligosaccharides (RO) are the factors primarily responsible for flatulence upon ingestion of soybean-derived products. ROs are hydrolyzed by alpha-galactosidases that cleave alpha-1,6-linkages of alpha-galactoside residues. The objectives of this study were the purification and characterization of extracellular alpha-galactosidase from Debaryomyces hansenii UFV-1. The enzyme purified by gel filtration and anion exchange chromatographies presented an Mr value of 60 kDa and the N-terminal amino acid sequence YENGLNLVPQMGWN. The Km values for hydrolysis of pNP alphaGal, melibiose, stachyose, and raffinose were 0.30, 2.01, 9.66, and 16 mM, respectively. The alpha-galactosidase presented absolute specificity for galactose in the alpha-position, hydrolyzing pNPGal, stachyose, raffinose, melibiose, and polymers. The enzyme was noncompetitively inhibited by galactose (Ki = 2.7 mM) and melibiose (Ki = 1.2 mM). Enzyme treatments of soy milk for 4 h at 60 degrees C reduced the amounts of stachyose and raffinose by 100%.

UI MeSH Term Description Entries
D009844 Oligosaccharides Carbohydrates consisting of between two (DISACCHARIDES) and ten MONOSACCHARIDES connected by either an alpha- or beta-glycosidic link. They are found throughout nature in both the free and bound form. Oligosaccharide
D011887 Raffinose A trisaccharide occurring in Australian manna (from Eucalyptus spp, Myrtaceae) and in cottonseed meal. Gossypose,Melitose,Melitriose
D005414 Flatulence Production or presence of gas in the gastrointestinal tract which may be expelled through the anus. Flatus
D006868 Hydrolysis The process of cleaving a chemical compound by the addition of a molecule of water.
D000519 alpha-Galactosidase An enzyme that catalyzes the hydrolysis of terminal, non-reducing alpha-D-galactose residues in alpha-galactosides including galactose oligosaccharides, galactomannans, and galactolipids. Beano,Melibiase,alpha-D-Galactopyranosidase,alpha-D-Galactosidase,alpha-Galactisidase,alpha-Galactosidase A,alpha-Galactosidases,alpha D Galactopyranosidase,alpha D Galactosidase,alpha Galactisidase,alpha Galactosidase,alpha Galactosidase A,alpha Galactosidases
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D001203 Ascomycota A phylum of fungi which have cross-walls or septa in the mycelium. The perfect state is characterized by the formation of a saclike cell (ascus) containing ascospores. Most pathogenic fungi with a known perfect state belong to this phylum. Ascomycetes,Cochliobolus,Sclerotinia,Ascomycete,Ascomycotas,Sclerotinias
D045730 Soy Foods Foods made from GLYCINE MAX. Soy foods are high in DIETARY PROTEINS and PHYTOESTROGENS such as ISOFLAVONES. Soy Sauce,Texturized Soy Protein,Tofu,Bean Curd, Soy,Miso,Natto,Soy Cheese,Tempeh,Texturized Vegetable Protein,Bean Curds, Soy,Cheese, Soy,Cheeses, Soy,Curd, Soy Bean,Curds, Soy Bean,Food, Soy,Foods, Soy,Protein, Texturized Soy,Protein, Texturized Vegetable,Proteins, Texturized Soy,Sauce, Soy,Soy Bean Curd,Soy Bean Curds,Soy Cheeses,Soy Food,Soy Protein, Texturized,Soy Proteins, Texturized,Texturized Soy Proteins,Vegetable Protein, Texturized,Vegetable Proteins, Texturized
D041942 Soy Milk A beverage prepared from GLYCINE MAX. Milk, Soy,Soy Beverage,Beverage, Soy,Beverages, Soy,Soy Beverages

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