Studies on Antibiotic Producers of Korean Soil Microbes (IV) -Isolation and Antibiotic Activity of Streptomyces Strain DMC-42-

한국(韓國) 토양균(土壤菌)중 항생물질(抗生物質) 생성균(生成菌)에 관한 연구(硏究) 제 4 보(第4報) -스트렙토마이세스속(屬) 균주(菌株) DMC-42의 분리(分離) 및 그 항균작용(抗菌作用)-

To find antibacterial strains of the soil microorganisms in Korea, they were isolated from the soil samples of different locations and screened for antibacterial activity against several standard microorganisms. An isolate among them had antibacterial activities against gram-positive and gram-negative bacteria. The examination of its morphological, biochemical, cultural and physiological characteristics according to the International Streptomyces Project methods showed that it belongs to the genus Streptomyces. This strain appears to be a novel strain when it was compared with those species of the genus which have been so far reported. The antibiotic metabolite was produced in the submerged culture of the strain. This metabolite was extracted from the culture filtrate and purified by ion-exchange column chromatography. Physico-chemical properties of the antibacterial metabolite were characterized.

한국 토양균 중에서 항균력이 있는 토양균을 분리하여 균 동정을 실시하였고 생성된 항균성 물질에 관해 실험하였던 바, 이 균주는 Streptomyces속 임이 확인되었고 동정 결과 type species와 일치하는 것은 없었으나 Streptomyces avellaneus와 가장 유사한 것으로 동정되었다. 이 균주에 의해서 생성된 항균성 물질의 항균병위는 사용된 Gram-positive균 중에서 Staphylococcus aureus에만 항균력을 나타내며 사용된 Gram-no-gative균 중에서는 Escherichia에만 항균력을 나타냈다. 이 균주에 의해 생성된 항균성 물질을 ion-ex-change column chromatography 등을 통하여 분리, 정제하였고, 여러가지 물리, 화학적 성질을 관찰해 본 결과 aminoglycoside계통의 항생물질로 인정되었다.