Microviridae, a family divided: isolation, characterization, and genome sequence of phiMH2K, a bacteriophage of the obligate intracellular parasitic bacterium Bdellovibrio bacteriovorus

J Bacteriol. 2002 Feb;184(4):1089-94. doi: 10.1128/jb.184.4.1089-1094.2002.


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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Bdellovibrio / virology*
  • DNA, Viral
  • Genome, Viral*
  • Intracellular Fluid / microbiology
  • Microviridae / genetics*
  • Microviridae / isolation & purification
  • Molecular Sequence Data
  • Sequence Homology, Amino Acid
  • Viral Proteins / analysis
  • Virion


  • DNA, Viral
  • Viral Proteins

Associated data

  • GENBANK/AF306496