Holosporaceae
| Holosporaceae | ||||||||||
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| Systematics | ||||||||||
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| Scientific name | ||||||||||
| Holosporaceae | ||||||||||
| ( Görtz and Schmidt , 2006) |
The Holosporaceae form a family within the Alphaproteobacteria . Like almost all bacteria of the order Rickettsiales , members of this family are living parasites or symbionts within the cells of the host (intracellularly).
The family consists of the genus:
- Holospora as well as from the genera that are not yet to be regarded as secure
- Caedibacter and
- Odyssella .
Occurrence
Representatives of Holospora and not securely positioned genus (Candidatus) Caedibacter were in the paramecium Paramecium caudatum found. Holospora penetrates the host's cell nucleus.
The species, which is also still uncertain in its taxonomic position and named Odysella thessalonicensis , was found in aquatic amoeba of the genus Acanthamoeba . As with almost all rickettsiae, the rod-shaped bacterium cannot be cultivated on an artificial nutrient medium. In contrast to Holospora , this bacterium does not live in the cell nucleus, but in the host's cell plasma. Odysella does not appear to cause harm to the host under normal conditions.
Another species provisionally assigned to this family on the basis of 16S rRNA analyzes was found in epithelial cells of the hepatopancreas ( midgut gland ) of shrimp . It causes necrotizing hepatopancreatitis (NHP), a disease that kills shrimp. This is why this species is often referred to as the "NHP bacterium" (NHPB). Affected shrimp species are u. a. Litopenaeus vannamei (also called Penaeus vannamei ) and Farfantepenaeus aztecus . This bacterium can cause great economic damage on shrimp farms . This disease of farmed shrimp first appeared on a shrimp farm in Texas in 1985, hence the name "Texas Pond Mortality Syndrome".
swell
- ↑ The system used here according to: LPSN List of Prokaryotic Names with Standing in Nomenclature ( Memento of the original from May 16, 2011 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ RJ Birtles, TJ Rowbotham, R. Michel, DG Pitcher, B. Lascola, S. Alexiou-Daniel and D. Raoult: 'Candidatus Odyssella thessalonicensis' gen. Nov., Sp. nov., an obligate intracellular parasite of Acanthamoeba species. in: International Journal of Systematic and Evolutionary Microbiology (2000), 50, pages 63-72 ISSN 1466-5026 PDF ( Memento of the original from February 10, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ JK Loy, FE Dewhirst, W. Weber, et al .: Molecular Phylogeny and In Situ Detection of the Etiologic Agent of Necrotizing Hepatopancreatitis in Shrimp in: Applied and Environmental Microbiology (1996), 62 (9), pp. 3439-3445. ISSN 0099-2240 PDF
literature
- Martin Dworkin, Stanley Falkow, Eugene Rosenberg, Karl-Heinz Schleifer, Erko Stackebrandt (Eds.) The Prokaryotes, A Handbook of the Biology of Bacteria . 7 volumes, 3rd edition, Springer-Verlag, New York et al. O., 2006, ISBN 0-387-30740-0 . Vol. 5: Proteobacteria: Alpha and Beta Subclasses ISBN 0-387-25495-1