Isolation and characterization of a recombination defective-dependent bacteriophage of Rhodobacter sphaeroides

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Abstract

A new virulent bacteriophage, designated RZ1, was isolated from a local pond on the facultative phototrophic bacterium Rhodobacter sphaeroides ZZ101. Electron microscopic studies revealed that, in general morphology, phage RZ1 resembles the λ bacteriophage of Escherichia coli. The host range of phage RZ1 is limited to some strains of R. sphaeroides. The phage genome consists of double-stranded DNA of about 44 kb lacking cohesive ends and seems to present terminal redundancy and cyclic permutation. RZ1 phage may carry out a lytic cycle only in recombination-defective mutants of R. sphaeroides. Nevertheless, a derivative of the RZ1 phage, termed RW1, able to grow in recombination-proficient strains of R. sphaeroides, has also been obtained. In vitro restriction analysis of both RZ1 and RW1 phages shows the presence of a rearrangement in their DNA. Generalized transduction of Strr and Rifr chromosomal markers has not been detected with either RZ1 or RW1 phages. © 1992 Springer-Verlag New York Inc.
Original languageEnglish
Pages (from-to)151-157
JournalCurrent Microbiology
Volume24
Issue number3
DOIs
Publication statusPublished - 1 Mar 1992

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