Halorubrum vacuolatum
| Halorubrum vacuolatum | |
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Scientific classification 
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| Missing taxonomy template (fix): | Halorubrum |
| Species: | Template:Taxonomy/HalorubrumH. vacuolatum
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| Binomial name | |
| Template:Taxonomy/HalorubrumHalorubrum vacuolatum (Mwatha and Grant 1993) Kamekura et al. 1997[1]
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Halorubrum vacuolatum is an extremely halophilic archaeon in the genus Halorubrum that was originally isolated from Lake Magadi in Kenya.[2] It lives in hypersaline environments and is commonly found in alkaline habitats such as salt lakes and soda lakes.[3]
Overview
Halorubrum vacuolatum is an extreme halophile adapted to environments with high salt concentrations and often alkaline conditions. As a member of the haloarchaea, it is able to survive extreme osmotic stress through specialized adaptations.[4]
Like other species in the genus Halorubrum, it is an aerobic heterotroph that utilizes organic compounds for growth.[3] Cells have been observed to contain gas vesicles.[2] Gas vesicles help the cell remain buoyant and adjust its position in the water.[5]
Research on H. vacuolatum and related haloarchaea has contributed to understanding microbial adaptation to extreme environments and has potential applications in biotechnology, particularly due to the stability of enzymes under high-salt conditions.[6]
Scientific classification
Halorubrum vacuolatum is classified within the domain Archaea, phylum Euryarchaeota, class Halobacteria, order Haloferacales, family Halorubraceae, and genus Halorubrum.[7]
Members of the family Halorubraceae are distinguished from other haloarchaea based on their placement in phylogenetic trees and shared molecular features identified through genomic analysis.[7] This family comprises a group of extremely halophilic archaea and includes related genera such as Halobaculum, Halohasta, Halolamina, and Halonotius, which share evolutionary relationships within the order Haloferacales.[7]
Members of this taxonomic group belong to haloarchaea adapted to life in hypersaline environments.[3] These organisms are commonly found in habitats such as salt lakes and solar salterns, where they play a significant role in microbial communities at high salt concentrations and share physiological adaptations that enable them to maintain osmotic balance and cellular function under extreme salinity.[3]
Morphology
Halorubrum vacuolatum is a halophilic archaeon that exhibits morphological characteristics typical of members of the genus Halorubrum.[3] Cells are short rod-shaped during exponential growth and become spherical in the stationary phase.[2]
Cells of H. vacuolatum have been observed to contain large gas vesicles.[2] These structures allow cells to remain suspended and regulate their position in the water column.[5]
Colonies of haloarchaea, including species of Halorubrum, are often pigmented due to the presence of carotenoids, which can give them a red or pink coloration.[3] These pigments can protect cells from ultraviolet radiation and oxidative damage.[8]
Like other haloarchaea, H. vacuolatum maintains cellular stability in high-salt conditions through adaptations to osmotic stress.[6]
Discovery and classification
Initial discovery
Halorubrum vacuolatum was originally isolated from Lake Magadi in Kenya, a hypersaline and alkaline soda lake in the East African Rift Valley.[2] The organism was first described as Natronobacterium vacuolatum based on its physiological and morphological characteristics, including its haloalkaliphilic nature, bright pink pigmentation, and the presence of gas vacuoles.[2]
The species was identified as a member of a group of haloalkaliphilic archaea adapted to environments with both high salinity and high pH, such as soda lakes.[2] Early classification of such organisms relied primarily on phenotypic characteristics, including morphology, biochemical properties, and membrane lipid composition.[3]
Reclassification
Subsequent phylogenetic analysis, particularly comparisons of 16S ribosomal RNA gene sequences, demonstrated that Natronobacterium vacuolatum was more closely related to members of the genus Halorubrum than to other species within the genus Natronobacterium.[9]
Phylogenetic tree reconstruction and sequence comparisons showed that the species clustered with members of Halorubrum, supporting its transfer to that genus.[9] As a result, Kamekura and colleagues proposed reclassification of the species as Halorubrum vacuolatum.[9]
Significance
Halorubrum vacuolatum and related haloarchaea are important model organisms for understanding how life can survive under extreme environmental conditions. These microorganisms inhabit hypersaline environments such as salt lakes and solar salterns, where salt concentrations far exceed those tolerated by most life forms.[3][4] Studying their adaptations provides insight into mechanisms of cellular stability, protein function, and osmotic balance under extreme stress.
Haloarchaea are also useful in biotechnology because they produce enzymes that can still function in high-salt conditions.[6] In addition, haloarchaea produce C50 carotenoids such as bacterioruberin, which contribute to membrane stability and protect cells from ultraviolet radiation and oxidative stress.[8] These carotenoids also exhibit antioxidant activity and have potential applications in food, pharmaceutical, and medical industries.[8]
Gas vesicles found in some haloarchaea, including H. vacuolatum, provide buoyancy that allows cells to position themselves optimally within the water column.[5] These structures have attracted interest for their potential applications in biomedical imaging and biotechnology.[5]
Studying H. vacuolatum helps scientists better understand how microorganisms can survive in extreme environments.[4]
References
- ↑ 1.0 1.1 "LPSN - Halorubrum vacuolatum". Deutsche Sammlung von Mikroorganismen und Zellkulturen. Retrieved 2022-07-14.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Mwatha, W. E.; Grant, W. D. (1993). "Natronobacterium vacuolata sp. nov., a haloalkaliphilic archaeon isolated from Lake Magadi, Kenya". International Journal of Systematic Bacteriology. 43 (3): 401–404. doi:10.1099/00207713-43-3-401.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Oren, A. (2002). "Molecular ecology of extremely halophilic Archaea and Bacteria". FEMS Microbiology Ecology. 39: 1–7. doi:10.1111/j.1574-6941.2002.tb00900.x.
- ↑ 4.0 4.1 4.2 Oren, A. (2013). "Life at high salt concentrations, intracellular KCl concentrations, and acidic proteomes". Frontiers in Microbiology. 4: 315. doi:10.3389/fmicb.2013.00315. PMC 3817357. PMID 24204364.
- ↑ 5.0 5.1 5.2 5.3 Pfeifer, F. (2015). "Haloarchaea and the Formation of Gas Vesicles". Life. 5 (1): 385–402. Bibcode:2015Life....5..385P. doi:10.3390/life5010385. PMC 4390858. PMID 25648404.
- ↑ 6.0 6.1 6.2 DasSarma, S.; DasSarma, P. (2015). "Halophiles and their enzymes: negativity put to good use". Current Opinion in Microbiology. 25: 120–126. Bibcode:2015COMb...25..120D. doi:10.1016/j.mib.2015.05.009. PMID 26066288.
- ↑ 7.0 7.1 7.2 Gupta, R. S.; Naushad, S.; Fabros, R.; Adeolu, M. (2016). "A phylogenomic reappraisal of family-level divisions within the class Halobacteria". Antonie van Leeuwenhoek. doi:10.1007/s10482-016-0660-2. PMID 26837779.
- ↑ 8.0 8.1 8.2 Bouhamed, S. B. H.; Chaari, M.; Baati, H.; Zouari, S.; Ammar, E. (2024). "Extreme halophilic Archaea: Halobacterium salinarum carotenoids characterization and antioxidant properties". Heliyon. 10 (17). Bibcode:2024Heliy..1036832B. doi:10.1016/j.heliyon.2024.e36832. PMID 39281633 Check
|pmid=value (help). Unknown parameter|article-number=ignored (help) - ↑ 9.0 9.1 9.2 Kamekura, M.; Dyall-Smith, M. L.; Upasani, V.; Ventosa, A.; Kates, M. (1997). "Diversity of alkaliphilic halobacteria: proposals for transfer of Natronobacterium vacuolatum to Halorubrum vacuolatum comb. nov". International Journal of Systematic Bacteriology. 47 (3): 853–857. doi:10.1099/00207713-47-3-853.
External links
Lua error in Module:Taxonbar at line 146: attempt to index field 'wikibase' (a nil value).
Category:Archaea Category:Halophiles Category:Methanobacteriati
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