갯지렁이(Perinereis aibuhitensis)에서 분리한 Bacillus spp.의 생리생화학적 특성 분석

국문 초록 (Abstract)

본 연구에서는 연안 갯벌에서 유기물 분해능이 매우 우수한 것으로 알려진 갯지렁이(Perinereis aibuhitensis)에 내생하고 있는 균주 중 호기성과 혐기성 조건에서 생장 가능한 5 종류의 Bacillus 균주 CBW3, CBW4, CBW9, CBW14 그리고 EBW10를 선별하여 그 특성을 비교 분석하였다. 16S rRNA 염기서열에 기초하여 동정한 결과, CBW3과 CBW14는 B. nanhaiensis, B. arsenicus 그리고 B. barbaricus와 99.8% 이상의 높은 상동성을, CBW4, CBW9 그리고 EBW10 균주는 B. anthracis, B. algicoa 그리고 B. thuringiensis와 각각 92.7%, 99.8% 그리고 99.8%의 상동성을 보였다. 이들 대부분 균주들의 생장온도 범위는 4-45℃, 염도는 0-17%, pH는 5-9 범위로 매우 다양하게 나타났다. 모든 균주들이 casein, starch 분해 효소를 가지고 있었으며 특히 균주 EBW10은 시험한 모든 고분자 물질을 분해할 수 있는 protease, amylase, cellulase. lipase 등의 효소 활성을 가지고 있을 가능성이 높음을 제시해주었다. 대상 균주 5 종 모두 alkaline phosphatase 활성을 가지며, CBW3, CBW4 그리고 EBW10은 acid phospatase 활성을 동시에 가지고 있었으며, CBW3, CBW14, EBW10은 esterase (C4) 활성을, CBW3, CBW9, EBW10은 CBW4는 esterase lipase (C8) 활성을 나타냈다. 지방산 분석 결과 CBW3, CBW9, CBW14, EBW10 균주에서는 anteiso C15:0이 균주에 따라 차이가 있었지만 약 42.8%에서 55.7%까지 가장 많은 비율을 차지하는 지방산으로 분석되었고, 오직 CBW4에서만 iso C15:0이 전체 지방산의 46.9%로 가장 많은 비율로 나타났다.

다국어 초록 (Multilingual Abstract)

This study compared the characteristics of five Bacillus strains capable of aerobic and anaerobic growth, CBW3, CBW4, CBW9, CBW14 and EBW10. They were isolated and selected from a polychaete, Perinereis aibuhitensis, which is known as a good degrader of organic compounds in marine wetland. Based on a 16S rRNA sequence, CBW3 and CBW14 were found to share more than 99.8% similarity with B. nanhaiensis, B. arsenicus and B. barbaricus. CBW4, CBW9 and EBW10 shared 92.7%, 99.8%, and 99.8% similarity with B. anthracis, B. algicoa and B. thuringiensis, respectively. The temperature, salinity, and pH ranges of the cell growth of the Bacillus strains were 4-45℃, 0-17%, and pH 5-pH 9, respectively. All Bacillus strains were found to exhibit enzyme activities for the degradation of casein and starch. Notably, strain EBW10 exhibited the enzyme activities for all the tested macromolecules, DNA, casein, starch, cellulose, and four kinds of Tweens, which suggests the possibility that it had protease, amylase, cellulose, and lipase. All five Bacillus strains had alkaline phosphatase activities, and the strains CBW3, CBW4, and EBW10 also had acid phospatase. Strains CBW3 and EBW10 exhibited the enzyme activities both for esterase (C4) and esterase lipase (C8). The analysis of fatty acids revealed that in all strains, major fatty acids were anteiso C15:0 and iso C15:0.

목차 (Table of Contents)

• 서론
• 재료 및 방법
• 결과 및 고찰
• References
• 초록

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