|Group:||Group I (dsDNA)|
|(unranked):||Nucleocytoplasmic large DNA viruses|
Mimivirus is a viral genus containing a single identified species named Acanthamoeba polyphaga mimivirus (APMV), or is a group of phylogenetically related large viruses (designated usually MimiN). In colloquial speech, APMV is more commonly referred to as just "mimivirus". Until October 2011, when a larger virus Megavirus chilensis was described, it had the largest capsid diameter of all known viruses. Mimivirus has a large and complex genome compared with most other viruses. Mimivirus, short for "mimicking microbe", is so called to reflect its large size and apparent Gram-staining properties.
APMV was discovered serendipitously in 1992 within the amoeba Acanthamoeba polyphaga, after which it is named, during research into Legionellosis. The virus was observed in a gram stain and mistakenly thought to be a gram-positive bacterium. As a consequence it was named Bradfordcoccus, after the district the amoeba was sourced from in Bradford, England. In 2003, researchers at the Université de la Méditerranée in Marseille, France published a paper in Science identifying the micro-organism as a virus.
Mimivirus may be a causative agent of some forms of pneumonia; this is based mainly on indirect evidence in the form of antibodies to the virus discovered in pneumonia patients. However, the classification of mimivirus as a pathogen is tenuous at present as there have been only a couple of papers published potentially linking mimivirus to actual cases of pneumonia. Indeed, a significant fraction of pneumonia cases are due to unknown etiology.
Mimivirus has been placed into a viral family by the International Committee on Taxonomy of Viruses as a member of the Mimiviridae, and has been placed into Group I of the Baltimore classification system. Although not strictly a method of classification, Mimivirus joins a group of large viruses known as nucleocytoplasmic large DNA viruses (NCLDV). They are all large viruses which share both molecular characteristics and large genomes. The mimivirus genome also possesses 21 genes encoding homologs to proteins which are seen to be highly conserved in the majority of NCLDVs, and further work suggests that mimivirus is an early divergent of the general NCLDV group.
The mimivirus is the second-largest virus, preceded by the recently discovered Megavirus chilensis, and has a capsid diameter of 400 nm. Protein filaments measuring 100 nm project from the surface of the capsid, bringing the total length of the virus up to 600 nm. Variation in scientific literature renders these figures as highly approximate, with the "size" of the virion being casually listed as anywhere between 400 nm and 800 nm, depending on whether total length or capsid diameter is actually quoted. The capsid appears hexagonal under an electron microscope, therefore the capsid symmetry is icosahedral. It does not appear to possess an outer viral envelope, suggesting that the virus does not exit the host cell by exocytosis.
Mimivirus shares several morphological characteristics with all members of the NCLDV group of viruses. As an internal lipid layer surrounding the central core is present in all other NCLDV viruses, it has been suggested by M. Suzan-Monti et al. that this may also be present in mimivirus. The condensed central core of the virion appears as a dark region under the electron microscope. The large genome of the virus resides within this area.
Several mRNA transcripts can be recovered from purified virions. Like other NCLDVs, transcripts for DNA polymerase, a capsid protein and a TFII-like transcription factor were found. However, three distinct aminoacyl tRNA synthetase enzyme transcripts and four unknown mRNA molecules specific to mimivirus were also found. These pre-packaged transcripts can be translated without viral gene expression and are likely to be necessary to Mimivirus for replication. Other DNA viruses, such as the Human cytomegalovirus and Herpes simplex virus type-1, also feature pre-packaged mRNA transcripts.
The mimivirus genome is a linear, double-stranded molecule of DNA with 1,181,404 base pairs in length. This makes it the largest viral genome in scientific knowledge, outstripping the next-largest virus genome of the Cafeteria roenbergensis virus by about 450,000 base pairs. In addition, it is larger than at least 30 cellular clades.
In addition to the large size of the genome, mimivirus possesses an estimated 979 protein-coding genes, far exceeding the minimum 4 genes required for viruses to exist (c.f. MS2 and Qβ viruses). Analysis of its genome revealed the presence of genes not seen in any other viruses, including aminoacyl tRNA synthetases, and other genes previously thought only to be encoded by cellular organisms. Like other large DNA viruses, mimivirus contains several genes for sugar, lipid and amino acid metabolism, as well as some metabolic genes not found in any other virus. Roughly 90% of the genome was of coding capacity, with the other 10% being "junk DNA".
The stages of mimivirus replication are not well known, but as a minimum it is known that mimivirus attaches to a chemical receptor on the surface of an amoeba cell and is taken into the cell. Once inside, an eclipse phase begins, in which the virus disappears and all appears normal within the cell. After about four hours small accumulations can be seen in areas of the cell. Eight hours after infection many mimivirus virions are clearly visible within the cell. The cell cytoplasm continues to fill with newly synthesised virions and about 24 hours after initial infection the cell likely bursts open to release the new mimivirus virions.
Little is known about the details of this replication cycle, most obviously attachment to the cell surface and entry, viral core release, DNA replication, transcription, translation, assembly and release of progeny virions. However, scientists have established the general overview given above using electron micrographs of infected cells. These micrographs show mimivirus capsid assembly in the nucleus, acquisition of an inner lipid membrane via budding from the nucleus, and particles similar to those found in many other viruses, including all NCLDV members. These particles are known in other viruses as viral factories and allow efficient viral assembly by modifying large areas of the host cell.
Implications for defining "life" 
|This section does not cite any references or sources. (September 2012)|
Mimivirus possesses many characteristics which place it at the boundary of living and non-living. It is as large as several bacterial species, such as Rickettsia conorii and Tropheryma whipplei, possesses a genome of comparable size to several bacteria, including those above, and codes for products previously not thought to be encoded by viruses. In addition, mimivirus possesses genes coding for nucleotide and amino acid synthesis, which even some small obligate intracellular bacteria lack. This means that unlike these bacteria, mimivirus is not dependent on the host cell genome for coding the metabolic pathways for these products. They do however, lack genes for ribosomal proteins, making mimivirus dependent on a host cell for protein translation and energy metabolism.
Because its lineage is very old and could have emerged prior to cellular organisms, Mimivirus has added to the debate over the origins of life. Some genes unique to Mimivirus, including those coding for the capsid, have been conserved in a variety of viruses which infect organisms from all domains. This has been used to suggest that Mimivirus is related to a type of DNA virus that emerged before cellular organisms and played a key role in the development of all life on Earth. An alternative hypothesis is that there were three distinct types of DNA viruses that were involved in generating the three known domains of life - eukarya, archaea and bacteria.
Nevertheless, mimivirus does not exhibit the following characteristics, all of which are part of many conventional definitions of life: homeostasis, response to stimuli, growth in the normal sense of the term (instead replicating via self-assembly of individual components) or undergoing cellular division.
See also 
- Cafeteria roenbergensis virus the largest marine virus
- Marseillevirus another giant virus
- Megavirus - The largest known virus
- Mycoplasma genitalium – one of the smallest bacteria
- Nanoarchaeum equitans – smallest known independent cell
- Parvovirus – smallest known viruses
- Pelagibacter ubique – possesses one of the smallest bacterial genomes
- Virophage – a virus that requires the host cell to be co-infected with a giant virus
- Ghedin, E. .; Claverie, J. . (Aug 2005). "Mimivirus relatives in the Sargasso sea" (Free full text). Virology Journal 2: 62. doi:10.1186/1743-422X-2-62. PMC 1215527. PMID 16105173.
- "World's biggest virus found in sea off Chile". London: Telegraph UK. 11 October 2011. Retrieved 11 November 2011.
- Wessner, D R (2010). "Discovery of the Giant Mimivirus". Nature Education 3 (9): 61. Retrieved 2012-01-07.
- La Scola B, Audic S, Robert C, Jungang L, de Lamballerie X, Drancourt M, Birtles R, Claverie JM, Raoult D. (2003). "A giant virus in amoebae". Science 299 (5615): 2033. doi:10.1126/science.1081867. PMID 12663918.
- La Scola B, Marrie T, Auffray J, Raoult D (2005). "Mimivirus in pneumonia patients". Emerg Infect Dis 11 (3): 449–52. PMID 15757563.
- Marrie TJ, Durant H, Yates L (1989). "Community-Acquired Pneumonia Requiring Hospitalization: 5-Year Prospective Study". Reviews of Infectious Diseases 11 (4): 586–99. doi:10.1093/clinids/11.4.586. PMID 2772465.
- Claverie J-M (2010). Mahy W.J. and Van Regenmortel M. H. V., ed. Desk Encyclopedia of General Virology (1 ed.). Oxford: Academic Press. p. 189.
- Leppard, Keith; Nigel Dimmock; Easton, Andrew (2007). Introduction to Modern Virology (6 ed.). Blackwell Publishing Limited. pp. 469–470.
- Xiao C, Kuznetsov YG, Sun S, Hafenstein SL, Kostyuchenko VA, Chipman PR, Suzan-Monti M, Raoult D, McPherson A, Rossmann MG (2009-04-28). "Structural Studies of the Giant Mimivirus". In Sugden, Bill. PLoS Biol. 7 (4): e92. doi:10.1371/journal.pbio.1000092. PMC 2671561. PMID 19402750.
- Suzan-Monti M, La Scola B, Raoult D (2006). "Genomic and evolutionary aspects of Mimivirus". Virus Research 117 (1): 145–155. doi:10.1016/j.virusres.2005.07.011. PMID 16181700.
- Nature: "'Virophage' suggests viruses are alive" by Helen Pearson 2008
- "Acanthamoeba polyphaga mimivirus, complete genome". NCBI.
- Claverie, Jean-Michel; et al. (2006). "Mimivirus and the emerging concept of 'giant' virus". Virus Research 117 (1): 133–144. doi:10.1016/j.virusres.2006.01.008. PMID 16469402.
- Prescott, Lansing M. (1993). 2nd edition, ed. Microbiology. Dubuque, IA: Wm. C. Brown Publishers. ISBN 0-697-01372-3.
- Siebert, Charles (2006-03-15). "Unintelligent Design". Discover Magazine.
- Forterre, Patrick (2006). "Three RNA cells for ribosomal lineages and three DNA viruses to replicate their genomes: A hypothesis for the origin of cellular domain". PNAS 103 (10): 3669–3674. doi:10.1073/pnas.0510333103. PMC 1450140. PMID 16505372.
Further reading 
- Raoult, D.; et al. (2004). "The 1.2-megabase genome sequence of Mimivirus". Science 306 (5700): 1344–1350. doi:10.1126/science.1101485. PMID 15486256.
- Ghedin, Elodie; Claverie, J. M. (2005). "Mimivirus relatives in the Sargasso sea". Virology Journal 2: 62. doi:10.1186/1743-422X-2-62. PMC 1215527. PMID 16105173.
- Peplow, Mark, 2004, "Giant virus qualifies as 'living organism'," News@Nature
- "Mimivirus: discovery of a giant virus". Press Release. Paris: Centre national de la recherche scientifique. 2003-03-28.
- New Scientist, Issue 2544, 25 March 2006.
- Highfield, Roger (2004-10-15). "The Bradford bug that may be a new life form". London: Daily Telegraph.
- "Scientists investigate structural details of the largest known virus". Science News. 2009-04-28.
- Keim, Brandon (2009-05-05). "Viral Missing Link Caught on Film". Wired Science.
- Viralzone: Mimiviridae
- International Committee on Taxonomy of Viruses (ICTV) picture gallery - images of mimivirus
- Giant Viruses: The recent discovery of really, really big viruses is changing views about the nature of viruses and the history of life by James L. Van Etten July–August 2011 American Scientist Volume 99, Number 4, page: 304, doi:10.1511/2011.91.304
- The webpage for Mimivirus