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Microviridae
''Microviridae'' is a family of bacteriophages with a single-stranded DNA genome. The name of this family is derived from the Greek micro, meaning ''small''. This refers to the size of their genomes, which are among the smallest of the DNA viruses. Enterobacteria, intracellular parasitic bacteria, and spiroplasma serve as natural hosts. There are currently 12 species in this family, divided among 7 genera and one subfamily.〔(【引用サイトリンク】url=http://viralzone.expasy.org/all_by_species/114.html )〕〔(【引用サイトリンク】title=Virus Taxonomy: 2014 Release )〕
==Virology==
The virons are non-enveloped, round with an icosahedral symmetry (T = 1). They have a diameter between 25–27 nanometers and lack tails. Each viron has 60 copies each of the F, G, and J proteins and 12 copies of the H protein. They have 12 pentagonal trumpet-shaped pentomers (~7.1 nm wide × 3.8 nm high), each of which composed of 5 copies of G and one of the H protein.
Viruses in this family replicate their genomes via a rolling circle mechanism and encode dedicated RCR initiation proteins.〔Keegstra W, Baas PD, Jansz HS (1979) Bacteriophage phi X174 RF DNA replication in vivo. A study by electron microscopy" ''J Mol Biol'' 135(1) 69–89〕〔Fluit AC, Baas PD, Jansz HS (1986) Termination and reinitiation signals of bacteriophage phi X174 rolling circle DNA replication" ''Virology'' 154(2) 357–368〕
Although the majority of species in this family have lytic life cycles, a few may have temperate life cycles.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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