Enzyme Details

EC Classification

3.2.1.23

Enzyme name
(recommended)

beta-galactosidase

Alternative names

lactozym
trilactase
beta-D-galactoside galactohydrolase
lactase (ambiguous)
beta-lactosidase
maxilact
hydrolact
beta-D-lactosidase
S 2107
beta-D-galactanase
oryzatym
sumiklat

Classification

Hydrolases

Glycosidases

Hydrolysing O-glycosyl compounds

Catalyses reactions

H2O + alpha-Lactose <-> D-Glucose + D-Galactose

H2O + Galactan <-> D-Galactose + Galactan

H2O + alpha-Lactose <-> alpha-D-Glucose + D-Galactose

H2O + Lactose 6-phosphate <-> Phosphate + alpha-Lactose

H2O + beta-D-Galactosyl-1,4-beta-D-glucosylceramide <-> beta-D-Galactose + Glucosylceramide

H2O + Galactosylglycerol <-> Glycerol + Galactose

H2O + D-Galactosyl-N-acetyl-D-galactosaminyl-(N-acetylneuraminyl)-D-galactosyl-D-glucosylceramide <-> Galactose + N-Acetyl-D-galactosaminyl-(N-acetylneuraminyl)-D-galactosyl-D-glucosylceramide

H2O + 3-Ketolactose <-> beta-D-Glucose + 3-Keto-beta-D-galactose

H2O + GA1 <-> D-Galactose + GA2

H2O + p-Nitrophenyl-beta-D-galactoside <-> beta-D-Galactose + p-Nitrophenol

H2O + o-Nitrophenyl-beta-D-galactoside <-> beta-D-Galactose + o-Nitrophenol

H2O + o-Nitrophenyl beta-D-galactopyranoside 6-phosphate <-> D-Galactose 6-phosphate + o-Nitrophenol

H2O + Lactose <-> D-Glucose + D-Galactose

H2O + p-Nitrophenyl beta-D-galactopyranoside 6-phosphate <-> D-Galactose 6-phosphate + p-Nitrophenol

H2O + Phenyl-beta-D-galactopyranoside <-> beta-D-Galactose + Phenol

H2O + 3,4-Dinitrophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 3,4-Dinitrophenol

H2O + m-Nitrophenyl-beta-D-galactoside <-> beta-D-Galactose + 3-Nitrophenol

H2O + 3-Methylphenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 3-Cresol

H2O + 4-Bromophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 4-Bromophenol

H2O + 3,5-Dinitrophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 3,5-Dinitrophenol

H2O + Pyridyl-beta-D-galactopyranoside <-> beta-D-Galactose + Pyridine

H2O + 4-Cyanophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 4-Cyanophenol

H2O + 3-Bromopyridyl-beta-D-galactopyranoside <-> beta-D-Galactose + 3-Bromopyridine

H2O + 3-Chloropyridyl-beta-D-galactopyranoside <-> beta-D-Galactose + 3-Chloropyridine

H2O + Isoquinyl-beta-D-galactopyranoside <-> beta-D-Galactose + Isoquinoline

H2O + 2-Naphthyl-beta-D-galactopyranoside <-> beta-D-Galactose + beta-Naphthol

H2O + 3-Methylpyridyl-beta-D-galactopyranoside <-> beta-D-Galactose + 3-Methylpyridine

H2O + 2,4-Dinitrothiophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 2,4-Dinitrothiophenol

H2O + 2,4,6-Trinitrothiophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 2,4,6-Trinitrothiophenol

H2O + 4-Bromoisoquinyl-beta-D-galactopyranoside <-> beta-D-Galactose + 4-Bromoisoquinoline

H2O + 3,5-Dimethylpyridyl-beta-D-galactopyranoside <-> beta-D-Galactose + 3,5-Dimethylpyridine

H2O + 2-Nitrophenyl-alpha-L-arabinopyranoside <-> alpha-L-Arabinose + o-Nitrophenol

H2O + beta-1,3-Galactobiose <-> 2 beta-D-Galactose

H2O + beta-1,3-Galactotriose <-> beta-D-Galactose + beta-1,3-Galactobiose

H2O + p-Nitrophenyl-beta-D-fucopyranoside <-> beta-D-Fucose + p-Nitrophenol

H2O + 4-Nitrophenyl-alpha-L-arabinopyranoside <-> alpha-L-Arabinose + p-Nitrophenol

H2O + 4-Cyanophenyl-beta-D-galactoside <-> beta-D-Galactose + 4-Cyanophenol

H2O + Allolactose <-> D-Glucose + D-Galactose

H2O + Methyl beta-D-galactoside <-> Methanol + beta-D-Galactose

H2O + 4-Methylumbelliferyl-beta-D-galactoside <-> beta-D-Galactose + 4-Methylumbelliferone

H2O + o-Nitrophenyl-beta-D-glucopyranoside <-> beta-D-Glucose + o-Nitrophenol

H2O + p-Nitrophenyl-beta-D-glucoside <-> beta-D-Glucose + p-Nitrophenol

H2O + p-Nitrophenyl-beta-D-fucoside <-> beta-D-Fucose + p-Nitrophenol

H2O + 4-Methylumbelliferyl-beta-D-glucoside <-> beta-D-Glucose + 4-Methylumbelliferone

H2O + 2,3-Dinitrophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 2,3-Dinitrophenol

H2O + 2,5-Dinitrophenyl-beta-D-galactopyranoside <-> beta-D-Galactose + 2,5-Dinitrophenol

H2O + D-Galactosyl-N-acetyl-D-galactosaminyl-(N-acetylneuraminyl)-D-galactosyl-D-glucosylceramide <-> beta-D-Galactose + N-Acetyl-D-galactosaminyl-(N-acetylneuraminyl)-D-galactosyl-D-glucosylceramide

H2O + Lactobionic acid <-> beta-D-Galactose + D-Gluconate

H2O + Lactitol <-> beta-D-Galactose + D-Sorbitol

H2O + Lactulose <-> beta-D-Galactose + D-Fructose

H2O + Arabinogalactan <-> beta-D-Galactose + Arabinogalactan

External links

Expasy
KEGG
BRENDA
IntEnz (EBI)
IUBMB
Reactome
MetaCrop

View all entries for EC Class: 3.2.1.23

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