다제내성 Acinetobacter baumannii의 생장을 억제하는 항생물질을 생산하는 방선균의 분리ㆍ동정 및 항균효과
Isolation and Identification of a Streptomyces sp. that Produces Antibiotics Against Multidrug - Resistant Acinetobacter baumannii.
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초록
계룡산 지역에서 토양시료를 채취하여 항생제 다제내성균을 효과적으로 제어할 수 있는 항생물질 생산균주를 분리,탐색하는 과정에서 Streptomyces sp. KH223균주를 선별하였다. 분리균주의 생화학적 특징과 16S ribosomal DNA 유전자 염기서열 분석 결과, 분리균주가 Streptomyces galbus 에 속함이 확인되었다. 분리균주의 배양 상등액은 49종의Acinetobacter baumannii 외 다양한 세균과 진균 등에 항균활성을 가지고 있었으며 특히 분리균주의 부탄올, 에틸아세테이트 분획물은 10여종의 A. baumannii에 최소생육저해농도 범위 0.8 μg/mL에서 5.0 μg/mL 으로 강한 항균력을 보였으며 기 분리된 cyclo(trp-trp)의 최소생육저해농도 범위12.5 μg/mL 보다도 강한 항균활성을 나타내었다. 또한 각각의 유기용매 분획물과 cyclo(trp-trp)은 Candida albicans IFO 6258, Bacillus subtilis IAM 1069, Micrococcus luteus JCM 1464, Aspergillus niger ATCC 9642, Streptomyces murinus JCM 4333 등 5종의 세균과 진균에 대해 2.5 μg/mL에서 50μg/mL 범위의 비교적 강한 항균력을 나타내었다. 본 실험을통하여 얻은 결과는 분리균주의 유용성과 앞으로 추가적인정제, 물질동정 실험을 통하여 새로운 항생물질을 탐색하는기초를 제공할 수 있을 것으로 판단된다.
Abstract
I isolated the actinomycete strain KH223 from soil samples collected from the Kye Ryong mountain area. This strain is antagonistic to the multidrug-resistant Acinetobacter baumannii. KH223was confirmed as belonging to the genus Streptomyces based on the scanning electronmicroscopy(SEM)observations of the diaminopimelicacid(DAP) type and morphological and physiological characteristics. Comparison of the 16S rDNA nucleotide sequences revealed that KH223 has a relationship with Streptomyces galbus. Production of antibiotics by KH223 was most favorable when cultured on a glucose, polypeptone, and yeast extract(PY) medium for 6 days at 27oC. The supernatant was found to exhibit an antimicrobial effect on various kinds of bacteria and fungi. Particularly, butanol and ethylacetate extracts of KH223 and cyclo(trp-trp)exhibited significant activity against A. baumannii at concentration ranges of 0.8-12.5 μg/mL, 5.0-25 μg/mL and 12.5→100 μg/mL, respectively. Moreover, in contrast to cyclo(trp-trp) had shown to activity against Micrococcus luteus JCM 1464 at the concentration of 12.5 μg/mL, the butanol extract of KH223 showed significant activity against Bacillus subtilis IAM 1069 and Micrococcus luteus JCM 1464 at the concentration of 0.4 and 0.8 μg/mL, respectively. These results suggest that KH223 may have a great potential in the production of new antibiotics to combat multidrug-resistant pathogens and further studies may be warranted for the same.
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