초록갈파래(Umbraulva japonica)에서 분리한 세균의 군집 구조 분석 및 항균 활성
Bacterial Community Analysis and Antibacterial Activity Isolated from Umbraulva japonica
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본 연구에서는 해조류인 Umbraulva japonica의 표면에서79개의 세균을 분리하였다. 16s rRNA 유전자 분석 결과, 주요 계통군은 Proteobacteria (74.69%), Actinobacteria (2.53%), Fimicute (2.53%), Bacteroidetes (20.25%)로 4개의 문(Phylum)이 관찰되었고, 7개의 강(Class), 13개의 목(Order), 17개의 과(Family), 31개의 속(Genus)을 확인하였다. 계통학적 분석 결과 3개의 균주가 표준균주와 97% 이하의 유사성을 보여 신속 또는 신종으로 보고될 가능성이 있다고 여겨지며, 향후 표준균주들과 함께 추가적인 신종 실험이 수행되어야 할 것으로 사료된다. 분리된 79 균주를 이용하여 인체 및 어류 병원균을 대상으로 항균 활성을 확인하였다. UJT7, UJT20, UJR17의 균체 현탁액이 Vibrio vulnificus에 대하여 항균 활성을 나타냈으며 UJR17의 균체현탁액은 V. vulnificus와 Streptococcus parauberis에 항균활성능이 있음을 확인하였다. UJT7은 Bacillus sp., UJT20 과 UJR17은 Pseudomonas sp.로 확인되었으며 다양한 활용을 위한 추가적인 실험을 수행한 후 유익하게 이용 될 수 있을 것이라 사료된다.
Abstract
In this study, 79 bacterial isolates were collected from the surface of marine algae Umbraulva japonica. As a result of analysis of 16s rRNA gene sequence, the 79 isolated bacteria were divided into 4 major groups: [Proteobacteria (74.69%), Actinobacteria (2.53%), Fimicutes (2.53%), and Bacteroidetes (20.25%)] – 7 classes (Actinobacteria, Flavobacteria, Sphingobacteria, Baciili, Alphaproteobacteria, Betaproteobacteria, and Gammaproteobacteria), 12 orders, 17 families and 31 genera. The newly isolated 3 strains could be novel species because of less than 97% similarity in 16s rRNA sequence. Therefore, it is considered that additional experiments should be conducted together with the standard strain. Analysis of 79 bacterial antibacterial activity against human and fish pathogens, such as Edwardsiella tarda, Vibrio harveyi, Streptococcus iniae, Steptococcus parauberis, Escherichia coli, Steptococcus mutans, Listeria monocytogenes and Vibrio vulnificus, was performed by using the supernatant liquid and pellet. As a result, pellet of UJT9, UJT20 and UJR17 showed antibacterial activity against V. vulnificus, UJR17 also showed antibacterial activity against S. parauberis. UJT7 and UJT20, UJR17 have been identified as Bacillus sp. and Pseudomonas sp. and it may be safely assented that it’s beneficial to carry out additional experiments for various applications.
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