Taxobox color violet image image width image caption name Corticovirus virus group i familia Corticoviridae genus Corticovirus subdivision ranks Species subdivision Pseudoalteromonas phage PM2 br The Corticoviridae is a family of phages with a double stranded DNA genome that infect bacteria. The name is derived from Latin cortex , corticis meaning crust or bark . The family has a single genus Corticovirus. The type species is Alteromonas phage PM2, which is currently the only known species in this genus. This family of viruses has been little studied and not much is known about it. Virology The virons consist of a round, icosahedral , non enveloped capsid of a diameter of 60 nanometers nm and an internal lipid cell membrane membrane located between outer and inner protein shell ref Kiveld, H.M., Kalkkinen, N. and Bamford, D.H. 2002 . Bacteriophage PM2 has a protein capsid surrounding a spherical lipid protein core. J. Virol., 76, 8169 8178. ref . The shells are composed of three layers whose surfaces reveals a pattern with distinctive features ref Kiveld, H.M., M nnist , R.H., Kalkkinen, N. and Bamford, D.H. 1999 . Purification and protein composition of PM2, the first lipid containing bacterial virus to be isolated. Virology, 262, 364 374. ref , including bush like spikes protruding from the twelve vertex geometry vertices ref Harrison, S.C., Caspar, D.L., Camerini Otero, R.D. and Franklin, R.M. 1971 . Lipid and protein arrangement in bacteriophage PM2. Nat. New Biol., 229, 197 201. ref . The icosahedral capsid T 12 or 13 is 56 nanometer s nm in diameter and is composed of 1200 P1 spike and 60 P2 capsid proteins. The pentameric receptor binding spikes protrude from the 12 fivefold axes. The capsid encloses an internal lipid core containing the structural proteins P3 to P9. Genome The genome is not segmented, constitutes 13 of the virus s weight and contains a single molecule of circular, supercoiled , double stranded DNA of 9.5 12 kilo base pair bases in length. The genome ... more details
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