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Antibiotic Resistance of Symbiotic Marine Bacteria Isolated from Marine Organisms in Jeju Island of South Korea

Yun Gyeong Park, Myeong Seok Lee, Dae-Sung Lee, Jeong Min Lee, Mi-Jin Yim, Hyeong Seok Jang and Grace Choi

We investigated antibiotics resistance of bacteria isolated from marine organisms in Jeju Island of South Korea. We isolated 17 strains from a marine sponge, algaes, and sea water collected from Biyangdo on Jeju Island. Seventeen strains were analyzed by 16S rRNA gene sequencing for species identification and tested antibiotic susceptibility of strains against six antibiotics. Strain JJS3-4 isolated from S. siliquastrum showed 98% similarity to the 16S rRNA gene of Formosa spongicola A2^T and was resistant to six antibiotics. Strains JJS1-1, JJS1-5, JJS2-3, identified as Pseudovibrio spp., and Stappia sp. JJS5-1, were susceptive to chloramphenicol and these four strains belonged to the order Rhodobacterales in the class Alphaproteobacteria. Halomonas anticariensis JJS2-1, JJS2-2 and JJS3-2 and Pseudomonas rhodesiae JJS4-1 and JJS4-2 showed similar resistance pattern against six antibiotics. We could isolate bacteria from marine organisms and their antibiotic resistance investigated, and conducted this study under the premise that such bacteria could produce secondary metabolites that could bring about useful antibiotic effects, resulting in species-specific results. We have a lot of unknown marine resources that we have not been able to explore yet. Bacteria are a valuable resource that can be developed into new useful materials.