Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 71, Issue 12, Pages 2905-2911Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.70274
Keywords
Escherichia coli; genome; lambda Red; sacB; markerless deletion
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We developed a simple method of generating markerless deletions in the Escherichia coli chromosome. The method consists of two recombination events stimulated by A Red recombinase. The first recombination replaced a target region with a marker cassette and the second then eliminated the marker cassette. The marker cassette included an antibiotic resistant gene and a negative selection marker (Bacillus subtilis sacB). Since sacB makes E. coli sensitive to sucrose, a markerless deletion strain was successfully selected using its sucrose-resistant phenotype. To stimulate these recombination events, 1-kbp homologous sequences adjacent to the target region were connected to both ends of the marker cassette or connected to each other by PCR. The average efficiency of the recombinations was 24% and 93% respectively. Eliminating the marker cassette with a fragment including an additional sequence, insertion was also possible. This markerless deletion method should be useful in creating a highly modified E. coli chromosome.
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