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. 1989 Apr;171(4):1898–1903. doi: 10.1128/jb.171.4.1898-1903.1989

Amplification of DNA at a prophage attachment site in Haemophilus influenzae.

L Kauc 1, S H Goodgal 1
PMCID: PMC209838  PMID: 2784790

Abstract

The Escherichia coli plasmids pBR322 and pBR327 can be taken up by Haemophilus influenzae but do not replicate in this organism; however, integration of pBR into the H. influenzae chromosome was achieved by ligation to a fragment of the Haemophilus phage S2 that carried a phage attachment site (attP). Once these sequences were integrated, they could serve as sites of recombination and amplification for homologous (pBR or phage) DNA. Amplification appeared to occur in one of two prophage sites (attB) present in the H. influenzae chromosome. The extent of amplification was different in different cells and reflected the ability of these sequences to undergo rearrangement leading to the formation of a DNA ladder. The ladder was obtained by treatment of DNA with restriction enzymes that cut outside of the inserted DNA, i.e., did not cut in the repeat sequence, and represented different numbers of repeat elements. Reversed-field gel electrophoresis was instrumental in resolving amplified structures. Inasmuch as single-cell isolates gave rise to the same ladder structure, it was assumed that amplification was under regulatory control and that it reproduced the same equilibrium of repeat structures. Transformation of E. coli with the amplified H. influenzae DNA resulted in precise excision and replication of the original monomeric plasmids. This excision was independent of the recA and recBC genes.

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