1887

Abstract

ϕEf11 is a temperate bacteriophage originally isolated by induction from a lysogenic strain recovered from an infected root canal, and the ϕEf11 prophage is widely disseminated among strains of . Because has emerged as a significant opportunistic human pathogen, we were interested in examining the genes and regulatory sequences predicted to be critical in the establishment/maintenance of lysogeny by ϕEf11 as a first step in the construction of the genome of a virulent, highly lytic phage that could be used in treating serious infections. Passage of ϕEf11 in JH2-2 yielded a variant that produced large, extensively spreading plaques in lawns of indicator cells, and elevated phage titres in broth cultures. Genetic analysis of the cloned virus producing the large plaques revealed that the variant was a recombinant between ϕEf11 and a defective ϕFL1C-like prophage located in the JH2-2 chromosome. The recombinant possessed five ORFs of the defective ϕFL1C-like prophage in place of six ORFs of the ϕEf11 genome. Deletion of the putative lysogeny gene module (ORFs 31–36) and replacement of the putative promoter from the recombinant phage genome with a nisin-inducible promoter resulted in no loss of virus infectivity. The genetic construct incorporating all the aforementioned ϕEf11 genomic modifications resulted in the generation of a variant that was incapable of lysogeny and insensitive to repressor, rendering it virulent and highly lytic, with a notably extended host range.

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2013-06-01
2019-10-22
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