[Gene knockout and knockin on the Escherichia coli lac operon loci using pBR322-red system].
Journal: 2009/July - Shengwu Gongcheng Xuebao/Chinese Journal of Biotechnology
ISSN: 1000-3061
PUBMED: 16013474
Abstract:
pBR322-Red is a newly constructed recombineering plasmid, which contains a part of the pBR322 vector, a series of regulatory elements of lambda-prophage and Red recombination genes. In the beginning, we studied the best working conditions of pBR322-Red, and then modified lac operon in E. coli W3110 chromosome using the plasmid as follow: Firstly, we knockout the lacI gene using Red-mediated recombineering with overlapping single stranded DNA oligonucleotides. Secondly, we substituded the lacA and lacY genes with lacZ, a report gene, by Red-mediated linearized double strands DNA homologous recombination. Finally, we detected the expression of lacZ on these loci for the first time. The results suggested that pBR322-Red system is suitable for modifying W3110 chromosome with various recombination strategies.
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