Journal
JOURNAL OF BACTERIOLOGY
Volume 184, Issue 4, Pages 1089-1094Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/jb.184.4.1089-1094.2002
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A novel single-stranded DNA phage, phiMH2K, of Bdellovibrio bacteriovorus was isolated, characterized, and sequenced. This phage is a member of the Microviridae, a family typified by bacteriophage ( phiX174. Although B. bacteriovorus and Escherichia coli are both classified as proteobacteria, phiMH2K is only distantly related to phiX174. Instead, phiMH2K exhibits an extremely close relationship to the Microviridae of Chlamydia in both genome organization and encoded proteins. Unlike the double-stranded DNA bacteriophages, for which a wide spectrum of diversity has been observed, the single-stranded icosahedral bacteriophages appear to fall into two distinct subfamilies. These observations suggest that the mechanisms driving single-stranded DNA bacteriophage evolution are inherently different from those driving the evolution of the double-stranded bacteriophages.
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