In order to identify plant natural products as anti-MRSA constituents, bioassay- guided solvent fractionation of methanolic extract of Eisenia bicyclis led to the isolation of active phlorotannins along with six known compounds eckol (EK), fucofuroeckol-A (FF), 7-phloroeckol (7-P), dioxinodehydroeckol (DD), phlorofucofuroeckol-A (PFF) and dieckol (DE), respectively. All the isolated compounds were tested for their anti-MRSA activities and the results were compared to each other. Among them, PFF showed the highest anti-MRSA activity compared to those of other phlorotannins tested. The MIC of PFF was determined to be in a range of 32 μg/mL against MRSA strains. Also, PFF was assessed its synergistic effects in combination with β- lactams, ampicillin, penicillin and oxacillin, against MRSA, suggesting PFF will disturb a drug-resistant mechanism in MRSA cells. In MRSA strain, it has been well known that penicillin binding protein 2a (PBP2a) plays a key role to acquire a drug resistance against β-lactam antibiotics. Therefore, it was investigated the effect of PFF on the expression of genes and protein related the drug resistance. PFF exhibited a significant direct inhibition on mRNA expression of mecI, mecR1 and mecA gene and synthesis of PBP2a protein in dose-dependent manner. These results provide a possible anti-MRSA mechanism of PFF. Thus, PFF interferes with the mRNA expression of PBP2a gene or regulator genes not the synthesis of protein. The results obtained in this study suggest that the compounds derived from E. bicyclis can be a good source of natural antibacterial agents against MRSA.
키워드
anti-MRSA activityEisenia bicyclisphlorotannins
저자
Sung-Hwan EOM [ Marine Bioprocess Research Center, Pukyong National University, Busan 608-737. ]
Young-Mog KIM [ Dept. of Food Science and Technology, Pukyong National University, Busan 608-737. ]
Se-Kwon KIM [ Dept. of Chemistry &Marine Bioprocess Research Center, Pukyong National University, Busan 608-737. ]
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
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