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Closed Access item Generation of Food-Grade Recombinant Lactic Acid Bacterium Strains by Site-Specific Recombination

Authors:Martín, M. Cruz
Alonso, Juan C.
Suárez Fernández, Juan Evaristo
Álvarez González, Miguel Ángel
Keywords:Lactic acid bacteria, Recombinant microorganism, Food industry, Plasmid, Phage, Vector, Homologous recombination, Genetic engineering, Lactobacillus casei, Microorganism resistance, Fermentation starter, Virus, Lactobacillaceae, Bacteria
Issue Date:Jun-2000
Publisher:American Society for Microbiology
Citation:Applied and Environmental Microbiology 66: 2599-2604 (2000)
Abstract:The construction of a delivery and clearing system for the generation of food-grade recombinant lactic acid bacterium strains, based on the use of an integrase (Int) and a resolvo-invertase (β-recombinase) and their respective target sites (attP-attB and six, respectively) is reported. The delivery system contains a heterologous replication origin and antibiotic resistance markers surrounded by two directly oriented six sites, a multiple cloning site where passenger DNA could be inserted (e.g., the cI gene of bacteriophage A2), the int gene, and the attP site of phage A2. The clearing system provides a plasmid-borne gene encoding β-recombinase. The nonreplicative vector-borne delivery system was transformed into Lactobacillus casei ATCC 393 and, by site-specific recombination, integrated as a single copy in an orientation- and Int-dependent manner into the attB site present in the genome of the host strain. The transfer of the clearing system into this strain, with the subsequent expression of the β-recombinase, led to site-specific DNA resolution of the non-food-grade DNA. These methods were validated by the construction of a stable food-grade L. casei ATCC 393-derived strain completely immune to phage A2 infection during milk fermentation.
Description:Final full-text version of the paper available at: http://aem.asm.org/cgi/content/abstract/66/6/2599.
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