Hahella ganghwensis

Hahella ganghwensis
Scientific classification
Domain: Bacteria
Phylum: Proteobacteria
Class: Gammaproteobacteria
Order: Oceanospirillales
Family: Hahellaceae
Genus: Hahella
Species:
H. ganghwensis
Binomial name
Hahella ganghwensis
Baik et al. 2005[1]
Type strain
DSM 17046, FR1050, JCM 12486, KCTC 12277[2]

Hahella gaghwensis is a marine strain of Gram-negative, aerobic, and obligately halophilic bacteria of the gammaproteobacteria.[3] Unlike its relative, H. chejuensis, H. ganghwensis is obligately halophilic, and both have distinctly different metabolic capabilities and fatty acid content.[4]

Morphology

Hahella ganghwensis forms a round, smooth, and convex colony with rod-shaped cells that are motile via the propulsion of a unipolar flagellum.[3] The colony has a cream color, as opposed to the red pigment seen in H. chejuensis and this can be used in situ to differentiate between the two.[5]

Isolation

Hahella gaghwensis was first characterized from isolates obtained from the Ganghwen Island off of the coast of South Korea.[3] It was discovered in 2005 while South Korean researchers were conducting studies of diversity for the known species, H. chejuensis. They determined through 16S rRNA sequencing that a strain, FR1050, was distinct enough from model H. chejuensis rRNA to warrant description as a separate species, and further research showed various biochemical and physiological differences

Metabolism

Notable for the aerobic microbe is the ability of H. ganghwensis to produce an overabundance of extracellular polysaccharides.[3] Though it is incapable of nitrate reduction, it does favor N-acetylglucosamine for growth.[3] It does not grow in the presence of nitrate, adipate, gluconate, or caprate[3]

Phylogeny

Based on 16S rRNA sequencing, the closest relatives were H. chejuensis strain KCTC 2396T (94.7%), Zooshikella ganghwensis strain JC2044T (90.1%) and Microbulbifer hydrolyticus strain DSM 11525T (90.7%).[6] It is in the gamma proteobacteria, but has no known industrial or human health affects, and more research will be required in order to determine the niche that the bacterial strain occupies.[7]

References

  1. ↑ Parte, A.C. "Hahella". LPSN.
  2. ↑ "Hahella ganghwensis". www.uniprot.org.
  3. 1 2 3 4 5 6 Baik, K. S. "Hahella ganghwensis sp. nov., Isolated from Tidal Flat Sediment." International Journal of Systematic and Evolutionary Microbiology (2005): 681-84. Print.
  4. ↑ Lee, H K, K S Bae, D S Lee, H S Lee, J. Chun, E Y Moon, and S H Ko. "Hahella chejuensis gen. nov., sp. nov., an Extracellular-polysaccharide-producing Marine Bacterium." International Journal of Systematic and Evolutionary Microbiology (2001): 661-66. Print.
  5. ↑ Lee, H K, K S Bae, D S Lee, H S Lee, J. Chun, E Y Moon, and S H Ko. "Hahella Chejuensis Gen. Nov., Sp. Nov., an Extracellular-polysaccharide-producing Marine Bacterium." International Journal of Systematic and Evolutionary Microbiology (2001): 661-66. Print.
  6. ↑ Wattam, A.R.; Abraham, D.; Dalay, O.; Disz, T.L.; Driscoll, T.; Gabbard, J.L.; Gillespie, J.J.; Gough, R.; Hix, D.; Kenyon, R.; Machi, D.; Mao, C.; Nordberg, E.K.; Olson, R.; Overbeek, R.; Pusch, G.D.; Shukla, M.; Schulman, J.; Stevens, R.L.; Sullivan, D.E.; Vonstein, V.; Warren, A.; Will, R.; Wilson, M.J.C.; Yoo, H. Seung; Zhang, C.; Zhang, Y.; Sobral, B.W. (2014). "PATRIC, the bacterial bioinformatics database and analysis resource". Nucleic Acids Res. 42 (Database issue): D581–91. doi:10.1093/nar/gkt1099. PMC 3965095. PMID 24225323.
  7. ↑ "Hahella." Bergey's Manual of Systematics of Archaea and Bacteria (2015): 1-2. Print.
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