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. 1984 Apr;158(1):325–330. doi: 10.1128/jb.158.1.325-330.1984

Physical map of the chromosomal region of Corynebacterium diphtheriae containing corynephage attachment sites attB1 and attB2.

R Rappuoli, G Ratti
PMCID: PMC215416  PMID: 6325395

Abstract

The chromosome of Corynebacterium diphtheriae C7 was recently shown to contain two equivalent attachment sites (attB1 and attB2) for lysogenization by corynephages (R. Rappuoli, J.L. Michel, and J.R. Murphy, J. Bacteriol. 153:1202-1210, 1983). Portions of bacterial chromosome containing each attB site, as well as a 3.5-kilobase (kb) EcoRI fragment containing both attB1 and attB2 sites, were cloned in the pUC8 plasmid vector. Restriction endonuclease mapping and Southern blot hybridization analysis of restriction endonuclease fragments showed that attB1 and attB2 are 2.25 kb apart on the chromosome. Furthermore, a 0.85-kb HincII-EcoRI restriction endonuclease fragment containing attB1, a 0.77-kb HincII-BamHI fragment containing attB2, and a 1.2-kb EcoRI-BamHI fragment containing attP share short homologous regions. No homology was detected between the sequences flanking the two attB sites. The isolation of a segregant which had lost the entire chromosomal segment contained between attB1 and attB2 suggests that this region is not essential for growth.

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Selected References

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