10105031001

β-Galactosidase

from E. coli overproducer

• Sinonimo/i: β-galactosidase
• Classificazione EC (Enzyme Commission): 3.2.1.23 (BRENDA, IUBMB)
• Codice UNSPSC: 12352204

Proprietà

• Origine biologica: Escherichia coli
• Livello qualitativo: 100
• Forma fisica: suspension
• PM: 540 kDa
• Confezionamento: pkg of 1,500 U
• Produttore/marchio commerciale: Roche
• Concentrazione: 5.00 mg/mL
• tecniche: activity assay: suitable
• pH ottimale: 7
• Compatibilità: suitable for UV spectrophotometry and general use
• applicazioni: life science and biopharma
• Condizioni di spedizione: wet ice
• Temperatura di conservazione: 2-8°C

Descrizione

Descrizione generale

β-Galactosidase or β-D-Galactoside galactohydrolase is basically a tetramer made up of identical four polypeptide chains, each constituting 1023 amino acids. It is very specific for D-galactose and requires K⁺ or Na⁺ and Mg²⁺ to be fully active. β-Galactosidase enzyme with an oxygen glycosidic bond catalyzes reactions with β-d-galactopyranosides.

At 37 °C with 2-nitrophenyl-β-D-galactoside as the substrate, approximately 30 U/mg at 25 °C with lactose as the substrate; standardized with BSA.

Specificità

Cleaves terminal galactose residues that are β1,4-linked to a monosaccharide, oligosaccharide, or glycopeptide.

Applicazioni

β-galactosidase has been used in enzyme-linked immunosorbent assay (ELISA). Use β-Galactosidase to produce a calibration curve in enzymatic assays.

Qualità

Contaminants: <0.01% GIDH, GPT, LDH, MDH, and oxaloacetate decarboxylase, each

Stato fisico

Suspension, in 3.2 M ammonium sulfate solution, pH approximately 6, crystalline

Nota sulla preparazione

The ammonium sulfate preparation is stable at 2 to 8 °C until the expiration date printed on the label. Use directly for most applications, e.g., quantitation of lactose.

In the absence of ammonium sulfate, solutions of β-galactosidase should be stabilized with Mg²⁺ (89 mM) and a thiol reagent (1mM β-mercaptoethanol, 1 mM dithiothreitol) [Beutler, 1984]. The thiol slows the formation of enzyme dimers resulting from intramolecular disulfide bridges.

Activator: K (50 mM) is required for activation (lactose hydrolysis).
Na (50 mM) is also an activator, particularly for hydrolysis of 2-nitrophenyl-β-D-galactopyranoside.

Altre note

For life science research only. Not for use in diagnostic procedures.

Informazioni sulla sicurezza

• Codice della classe di stoccaggio: 12 - Non Combustible Liquids
• Classe di pericolosità dell'acqua (WGK): WGK 1
• Punto d’infiammabilità (°F): No data available
• Punto d’infiammabilità (°C): No data available