Merck, G3153-5MG, β-Galactosidase from Escherichia coli

General description
Tetramer molecular weight 465 kDa (subunits 116.3 kDa each)
β-galactosidase is a 465 kDa tetrameric protein. It is coded by the LacZ gene.
Application
β-Galactosidase may be used for derivatization, such as an enzyme label for IgG, without prior dialysis or gel filtration.
β-Galactosidase from Escherichia coli has been used to produce biocatalytic Ca-alginate beads on a B-390 encapsulator (BUCHI). It has been used to prepare the source droplet solution and also as the cargo for Pep-1 (KETWWETWWTEWSQPKKKRKV-cysteamide).
Biochem/physiol Actions
β-galactosidase cleaves lactose into its monosaccharide components, glucose and galactose. It also catalyses the transglycosylation of glucose into allolactose, the inducer of β-galactosidase, in a feedback loop.
β-galactosidase is considered as a reporter enzyme in applications involving gene expression regulation, analysis of protein function/structure and target gene expression.
Packaging
Package size based on protein content
Physical form
Stabilized with phosphate buffer and sucrose
Other Notes
One unit will hydrolyze 1.0 μmole of o-nitrophenyl β-D-galactopyranoside to o-nitrophenol and D-galactose per min at pH 7.3 at 37 °C.