Construction and Analysis of Food-Grade β-Galactosidase Overexpression System.

contains two types of β-galactosidase, LacLM and LacZ, belonging to different glycoside hydrolase families. The difference in function between them has been unclear so far for practical application. In this study, and from ATCC51647 were cloned into constitutive lactobacillal expression vector pMG36e, respectively.