Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Isolation and Characterization of Novel Alginate-Degrading Pseudoalteromonas sp. Y-4

  • Cho, Hyeon-Ah (Department of Food Science and Technology, Pukyong National University) ;
  • Kim, Hyun-Woo (Department of Marine Biology, Pukyong National University) ;
  • Kim, Young-Mog (Department of Food Science and Technology, Pukyong National University)
  • Received : 2012.06.22
  • Accepted : 2012.08.05
  • Published : 2012.09.30
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Abstract

To isolate an alginate-degrading bacterium, we conducted a single colony isolation using a solid medium containing alginate as the sole carbon source. A marine bacterium Y-4 capable of degrading alginate was isolated from seawater. The strain was identified to be Pseudoalteromonas sp., based on morphological, biochemical, 16S rDNA homology, and phylogenetic analyses. Moreover, Pseudoalteromonas sp. Y-4 exhibited alginate lyase activity in the presence of 4% alginate even though many known alginate-degrading bacteria degrade in the range of 0.5-1% alginate. The optimum culture conditions for the Y-4 strain were 2% alginate, pH 8.0, and 3% NaCl at $30^{\circ}C$. The highest alginate lyase activity was also observed under the same conditions. To our knowledge, this is the first reported isolation of a marine bacterium degrading high concentrations of alginate.

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References

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