Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation and characterization of marine bacteria with alginate degrading activity

알긴산 분해능을 갖는 Pseudoalteromonas 및 Vibrio 속 해양세균들의 분리 및 특성분석

  • Yoon, Young-Jun (Division of Bioengineering, Incheon National University) ;
  • Kim, Jung-Wan (Division of Bioengineering, Incheon National University)
  • Received : 2015.08.10
  • Accepted : 2015.12.04
  • Published : 2015.12.31
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Abstract

As an effort to utilize alginate, 103 bacterial isolates that were positive for the alginate lyase activity were isolated from various clams and seawater samples collected in Incheon coastal area. Among them, 3 strains (M1-2-1, M6-1, and C8-15) were finally selected for further analysis based on their activities at higher levels than others. These isolates were all Gram-negative and rod shaped halophilic bacteria with motility. According to their physiological and biochemical properties as well as DNA sequence of their 16S rRNA genes, M1-2-1 and M6-1 were identified as a member of genus Pseudoalteromonas and C8-15 belonged to genus Vibrio. They exhibited the alginate degrading activity at the maximal level when they were cultured in APY broth for 6-8 h at $25^{\circ}C$. Both their growth and the enzyme activity were greatly enhanced when NaCl was added to the growth medium. The crude alginate lyases from the supernatants of the bacterial cultures showed the highest activity at $45^{\circ}C$ and pH 7.0-8.0. M1-2-1 and M6-1 produced 2.723 and 1.976 g/L of reducing sugar from alginate, respectively, suggesting that they have potential for commercial application.

알긴산의 응용을 위하여 인천지역에서 수집한 다양한 패류와 해수로부터 알긴산 분해효소 활성이 우수한 103개의 균주를 분리하고 그 중 M1-2-1, M6-1, C8-15 등 분해능이 가장 우수한 3균주를 선발하여 그 특성을 분석하였다. 이들은 모두 그람 음성 간균이었고, 운동성이 있는 호염성 세균이었다. 또한 생리 생화학적 특성 분석과 16S rRNA 유전자의 염기서열 분석으로 M1-2-1과 M6-1은 Pseudoalteromonas 속, C8-15은 Vibrio 속에 속하는 세균으로 동정되었다. 이들의 알긴산 분해효소 활성은 알긴산이 유일한 탄소원인 APY 배지에 접종하여 $25^{\circ}C$에서 6-8시간 배양했을 때 최대로 나타났고, NaCl을 가했을 때 생장 및 효소 활성 모두 증진되었다. 이 분리 균주들의 알긴산 분해 조효소들은 $45^{\circ}C$와 pH 7.0-8.0에서 가장 높은 활성을 나타냈으며, Pseudoalteromonas sp. M1-2-1과 M6-1 균주는 각각 2.7232 g/L와 1.976 g/L의 환원당 생성능을 보여, 산업적으로 활용 가능성이 높은 것으로 사료되었다.

Keywords

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