β-Galactosidase is a glycoside hydrolase that hydrolyzes the β-glycosidic bond formed between galactose and its organic part. In Escherichia coli, the lacZ gene is the structural gene for β-galactosidase and can be used as part of the lac manipulator of the inducible system. β-Galactosidase hydrolyzes lactose to form glucose and galactose, which enter glycolysis, and also catalyzes the transgalactosylation of lactose to isolactose, which can be cleaved to monosaccharides.
CAS Number | 9031-11-2 |
Form | Solid |
Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
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