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. 1981 Oct;148(1):131–142. doi: 10.1128/jb.148.1.131-142.1981

Physical mapping of beta-converting and gamma-nonconverting corynebacteriophage genomes.

G A Buck, N B Groman
PMCID: PMC216175  PMID: 6270059

Abstract

Deoxyribonucleic acids (DNAs) from wild-type and mutant strains of beta-converting and gamma-nonconverting corynebacteriophages were isolated and physically characterized. The data obtained from DNA heteroduplexes, restriction enzyme banding profiles, and restriction maps reinforce the conclusion that beta and gamma phages are very closely related. The major physical differences seen in the DNA heteroduplexes are a small substitution bubble and one or two insertions which are present on the gamma phage genome. The insertions account for the differences in the genome sizes of beta and gamma phages, and with the substitution they are responsible for most of the differences in the restriction endonuclease profiles and maps of the corynebactriophage genomes, two special sites and the DNA fragments carrying them were identified. These were the cohesive (cos) sites and the specific attachment (attP) site of the vegetative phage genome. The behavior of these sites indicated that the transition of phage DNA from the vegetative to the prophage state involves the circularization of vegetative DNA through the cos sites and its integration into the bacterial chromosome via the attP site. The mechanism of corynebacteriophage integration was similar to that employed by Escherichia coli phage gamma. From the data assembled the physical and genetic maps of beta and gamma phage were oriented with respect to one another. The extensive similarity in their maps provides additional confirmation of a close evolutionary relationship.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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