Halorubrum Pleomorphic Virus 1
Halorubrum pleomorphic virus 1 (HRPV-1) is a single stranded DNA virus that infects the species of the archaeal genus ''Halorubrum''.Pietila, M, Laurinavicius S, Sund, J, Roine E & Bamford D (2009) The single-stranded DNA genome of novel archaeal virus Halorubrum pleomorphic virus 1 Is enclosed in the envelope decorated with glycoprotein spikes. J Virol 84 (2) 788-798 It is unlike any other known virus infecting the archaea with a single stranded DNA genome and an external lipid envelope and is classified in the family ''Pleolipoviridae'', genus ''Alphapleolipovirus'', species ''Halorubrum virus HRPV1''. __TOC__ Virology The virons are pleomorphic is shape with an external lipd envelope. There are two main structural proteins (VP3 and VP4) of molecular weights 15 and 53 kiloDaltons respectively. The genome does not appear to be associated with a nucleoprotein. The spike protein (VP4) is glycosylated. The lipid envelope is similar to its host's composition. VP3 is a membrane prot ...
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Archaea
Archaea ( ; singular archaeon ) is a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes. Archaea were initially classified as bacteria, receiving the name archaebacteria (in the Archaebacteria kingdom), but this term has fallen out of use. Archaeal cells have unique properties separating them from the other two domains, Bacteria and Eukaryota. Archaea are further divided into multiple recognized phyla. Classification is difficult because most have not been isolated in a laboratory and have been detected only by their gene sequences in environmental samples. Archaea and bacteria are generally similar in size and shape, although a few archaea have very different shapes, such as the flat, square cells of ''Haloquadratum walsbyi''. Despite this morphological similarity to bacteria, archaea possess genes and several metabolic pathways that are more closely related to those of eukaryotes, notably for the enzymes involved ...
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