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. 1980 May;142(2):588–602. doi: 10.1128/jb.142.2.588-602.1980

Integration of specialized transducing bacteriophage lambda cI857 St68 h80 dgnd his by an unusual pathway promotes formation of deletions and generates a new translocatable element.

R E Wolf Jr
PMCID: PMC294029  PMID: 6247325

Abstract

Molecular and genetic studies have revealed that several illegitimate recombinational events are associated with integration of the specialized transducing bacteriophage lambda cI57 St68 h80 dgnd his into either the Escherichia coli chromosome or into a plasmid. Most Gnd+ His+ transductants did not carry the prophage at att phi-80, and 10% were not immune to lambda, i.e., "nonlysogenic." Integration of the phage was independent of the phage Int and Red gene products and of the host's general recombination (Rec) system. In further studies, bacterial strains were selected which carried the phage integrated into an R-factor, pSC50. Restriction endonuclease analysis of plasmid deoxyribonucleic acid (DNA) purified from these strains showed that formation of the hybrid plasmids resulted from recombination between a single region of pSC50 and one of several sites within the lambda-phi 80 portion of the phage. Furthermore the his-gnd region of the phage, present in the chromosome of one nonlysogenic transductant, was shown to be able to translocate to pSC50. Concomitant deletion of phage DNA sequences or pSC50 DNA was frequently observed in conjunction with these integration or translocation events. In supplemental studies, a 22- to 24-megadalton segment of the his-gnd region of the chromosome of a prototrophic recA E. coli strain was shown to translocate to pSC50. One terminus of this translocatable segment was near gnd and was the same as a terminus of the his-gnd segment of the phage which translocated from the chromosome of the nonlysogenic transductant. These data suggest that integration of lambda cI857 St 68 h80 dgnd his may be directed by a recombinationally active sequence on another replicon and that the resulting cointegrate structure is subject to the formation of deletions which extend from the recombinationally active sequence. Translocation of the his-gnd portion of the phage probably requires prior replicon fusion, whereas the his-gnd region of the normal E. coli chromosome may comprise a discrete, transposable element.

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

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