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. 1989 Dec;57(12):3846–3850. doi: 10.1128/iai.57.12.3846-3850.1989

A method for allelic replacement that uses the conjugative transposon Tn916: deletion of the emm6.1 allele in Streptococcus pyogenes JRS4.

M Norgren 1, M G Caparon 1, J R Scott 1
PMCID: PMC259915  PMID: 2553613

Abstract

The emm6.1 allele of Streptococcus pyogenes JRS4 was deleted by using the conjugative transposon Tn916. The aphA-3 gene, conferring resistance to kanamycin, was cloned between the sequences flanking the structural gene for the type 6 M protein (emm6.1) and inserted into the BstXI site of Tn916 to generate the chimeric transposon Tn916-5K3. Because the BstXI site lies in a nonessential region of Tn916, the chimeric transposon could transfer by conjugation from Bacillus subtilis into JRS4. In some of the transconjugants, Tn916-5K3 replaced the emm6.1 locus of JRS4 by homologous recombination between the cloned emm6.1-flanking regions and the resident chromosome. One recombinant studied in detail, JRS75, was kanamycin resistant and tetracycline sensitive and lacked immunologically detectable M6 protein. Furthermore, by Southern blot analysis, the DNA region encompassing the emm6.1 structural gene was found to have been replaced by aphA-3.

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Selected References

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