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Lessons from the Sea: Complete Genome Sequence of a Marine Bacterium Hahella chehuensis and Its Algicidal Pigment

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Title
Lessons from the Sea: Complete Genome Sequence of a Marine Bacterium Hahella chehuensis and Its Algicidal Pigment
Other Titles
적조살상 해양미생물 하헬라 JeJu엔시스의 유전체 구조
Authors
Jeong, Haeyoung
Oh, T.K.
Kim, Ji Hyun
Lee, Hong Kum
Yoon, Sung Ho
Keywords
Hahella chejuensis; Harmful algal bloom (HAB); algicidal compound; genome sequencing; prodigiosin
Issue Date
2006
Citation
Jeong, Haeyoung, et al. 2006. "Lessons from the Sea: Complete Genome Sequence of a Marine Bacterium Hahella chehuensis and Its Algicidal Pigment". Korean J. Microbiol. Biotechnol, 34(1): 1-6.
Abstract
Harmful algal blooms (HABs or red tides), caused by uncontrolled proliferation of marine phytoplankton, impose a severe environmental problem and occasionally threaten even public health. We found that an EPS-producing bacterium Hahella chejuensis isolated from a marine sediment sample also produces a red pigment that kills red-tide dinoflagellates at the parts per billion level. H. chejuensis is the first sequenced species among algicidal bacteria as well as in the order Oceanospirillales. Sequence analysis showed a distant relationship to the Pseudomonas group. Its 7.2-megabase genome encodes basic metabolic functions and a large number of proteins involved in regulation or transport. One of the prominent features of the H. chejuensis genome is a multitude of genes of functional equivalence or of possible foreign origin. A significant proportion (~23%) of the genome appears to be of foreign origin, i.e. genomic islands, which encode genes for biosynthesis of exopolysaccharides, toxins, polyketides or non-ribosomal peptides, iron utilization, motility, type III protein secretion and pigment production. Molecular structure of the algicidal pigment was determined to be prodigiosin by LC-ESI-MS/MS and NMR analyses. Our work suggests a new possibility for controlling algal blooms by exploiting biotic interactions in the natural environment and provides a research model in marine bioprospecting through genome research.
URI
http://repository.kopri.re.kr/handle/201206/5984
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