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Isolation and Characterization of Starch-hydrolyzing Pseudoalteromonas sp. A-3 from the Coastal Sea Water of Daecheon, Republic of Korea  

Chi, Won-Jae (Department of Biological Science, Myongji University)
Park, Da-Yeon (Department of Biological Science, Myongji University)
Jeong, Sung-Cheol (Division of Forest Disaster Management, Korea Forest Research Institute)
Chang, Yong-Keun (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Hong, Soon-Kwang (Department of Biological Science, Myongji University)
Publication Information
Microbiology and Biotechnology Letters / v.39, no.4, 2011 , pp. 317-323 More about this Journal
Abstract
Strain A-3, an amylase-producing bacteria, was isolated from coastal seawater near Daecheon in the Republic of Korea. It was seen to possess a single polar flagella and grow well, on ASW-YP agar plates, at temperatures of between $20-37^{\circ}C$. However, it grew more slowly at the temperatures of $15^{\circ}C$ and $40^{\circ}C$. Similarly, it was observed to grow abundantly, in an Artificial Sea Water-Yeast extract-Peptone (ASW-YP) liquid medium, in a pH range of 6-9, but not grow at pHs of 4-5 and a pH of 10. Strain A-3 was noted as being close to Pseudoalteromonas phenolica O-$BC30^T$, Pseudoalteromonas luteoviolacea $NCIMB1893^T$, Pseudoalteromonas rubra $ATCC29570^T$, and Pseudoalteromonas byunsanensis $FR1199^T$, with 98.30%, 97.86%, 97.78%, and 97.25% similarities respectively, in its 16S rRNA sequence. A phylogenetic tree revealed that strain A-3 and P. phenolica O-$BC30^T$ belong to a clade. However, strain A-3 differed from P. phenolica O-$BC30^T$ in relation to a number of physiological characteristics. Strain A-3 exhibited no growth above 5% NaCl concentrations, no utilization of D-glucose, D-mannose, D-maltose, or D-melibose, and no lipase (C-14) activity. All of these properties strongly indicate that strain A-3 is distant from P. phenolica O-$BC30^T$ and thus led us to name it Pseudoalteromonas sp. A-3. Pseudoalteromonas sp. A-3 produces ${\alpha}$-amylase throughout growth. Maximal amylase activities of 144.48 U/mL and 149.20 U/mL were seen at pH 7.0 and $37^{\circ}C$, respectively. Pseudoalteromonas sp. A-3's high, stable production of ${\alpha}$-amylase in addition to its biochemical features, such as alkalitolerance, suggest that it is a good candidate for industrial applications.
Keywords
${\alpha}$-Amylase; marine bacteria; Pseudoalteromonas; phylogenetic analysis;
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