• 한국미생물·생명공학회지
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• 제24권1호
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• pp.27-36
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• 1996

The aim of the present research program was to identify and develop strains of actinomycetes producing antifungal antibiotics which inhibit cell wall biosynthesis. 860 strains of Actinomycetes were isolated from various soil samples. Three isolates, EMS4, EMP22, and L234 were selected as the strains producing antifungal antibiotics inducing abnormal morphology against Penicillium cyclopium, Cryptococcus laurentii, and Aspergillus flavus, respectively. Taxonomic unit characters of the strains were tested and the data were analyzed numerically using TAXON program. EMS4, EMP22, and L234 were indentified to be a member of Streptomyces lavendulae, Streptomyces willmorei, and Streptomyces aburaviensis, respectively.

• Journal of Microbiology and Biotechnology
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• 제5권6호
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• pp.324-334
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• 1995

The actinomycete strain A 11 was antagonistic to plant pathogenic fungi Phytophthora capsid and Magnaporthe grisea. Based on the diaminopimelic acid (DAP) type and morphological characteristics examined by scanning electron microscopy, the strain A 11 was confirmed to belong to the genus Streptomyces. Based on Willcox probability and similarity level, the strain A 11 was numerically identified as Streptomyces flaveus using TAXON program of Ward and Goodfellow. Antibiotic production of S. flaveus strain A 11 was most favorable when cultured on glycerol yeast extract peptone (GYP) agar for 20 days at $28^{\circ}C$. The crude antibiotics from solid GYP agar cultures of the strain A 11 were most effective against Phytophthora capsici and Sclerotinia sclerotiorum among the fungi tested. Antifungal activity of the antibiotics against Alternaria solani, Botryosphaeria dothidea, Cercospora capsici, Magnaporthe grisea, and Rhizoctonia solani was somewhat high, whereas Colletotrichum gloeosporioides and Fusarium oxysporum f. sp. cucumerinum were rarely inhibited even at high concentrations.

• Natural Product Sciences
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• 제16권3호
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• pp.175-179
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• 2010

The present study aimed to assess the antifungal properties of the essential oil fraction from Ligusticum chuanxiong (Umbelliferae) and its components against five clinically important Aspergillus species. The essential oil fraction was extracted from the underground parts of the plant by steam distillation, and its main components, namely, Z-ligustilide, butylidene phthalide, and p-cresol were isolated by column chromatography. The antifungal activities of the essential oils were evaluated by the broth dilution method. Both the total essential oil fraction of L. chuanxiong and its components showed significant anti-Aspergillus activity against all five tested strains with MICs between 62.5 and 250 ${\mu}g$/ml, respectively. In a checkerboard microtiter assay, the combination of antibiotics, itraconazole with the essential oil fraction of L. chuanxiong or its main components exhibited synergistic or additive, and in some cases indifferent, effects against the tested Aspergillus species, resulting in FICIs (fractional inhibiting concentration indices) ranging from 0.12 to 2, while the combination of antibiotics, amphothericin B with L. chuanxiong essential oils mostly showed antagonistic effects.

• 한국미생물·생명공학회지
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• 제23권2호
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• pp.170-177
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• 1995

To search and develop the compounds exhibiting antifungal activities against the mycelial phase of Candida albicans, approximately 2,900 microorganisms isolated from soil were examined for antifungal activity. Among them, a strain with preferential activity against the mycelial phase of Candida albicans was isolated and identified as Streptomyces sp. A393. Isolation and purification of compounds A393 showing antifungal activity against the mycelial phase of C. albicans were performed using XAD-7 column chromatography, silica gel chromatography, preparative thin- layer silica gel chromatography, and HPLC. The molecular weights of compounds isolated from Streptomyces sp. A393 were determined as 774, 790, 804 and 820. These compounds appeared to have a structure of macrolide antibiotics, oligomycin A, B, C and E. Especially, oligomycin E, which is formerly reported to have no antifungal activity, showed antifungal activity against the mycelial phase of Candida albicans.

• 한국미생물·생명공학회지
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• 제32권3호
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• pp.238-242
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• 2004

D. bryoniae를 원인균으로 하는 참외 만고병에 대해서 항만고병 활성물질을 생산하는 미생물을 방선균으로부터 선별 분리한 후 배양액으로부터 항균활성물질의 규명을 시도하였다. 항진균 물질과 같은 이차대사산물의 생산에 증가시키는 $K_2$$HPO_4$와 칼슘이온이 포함된 GSS배지에서 방선균 SKM338 균주를 180 rpm, $30^{\circ}C$, 5일 동안 배양하여 얻어진 배양 상등액으로부터 물리화학적인 방법으로 항진균 활성이 있는 물질을 분리 정제한 결과 참외의 만고병에 대한 생물농약으로 개발 가능한 방선균 유래의 항진균성 물질은 NMR, IR, UV 및 Mass spectral data 분석 등을 통해 polyene macrolide계에 속하는 항생물질인 Flavofungin, Fungichromin, Filipins로 밝혀졌으며 이들의 응용을 기대해 본다.

• Journal of Microbiology and Biotechnology
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• 제14권1호
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• pp.212-215
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• 2004

In order to develop a biocontrol agent that can effectively control Fusarium wilt on Cymbidium genus, the effectiveness of antagonistic microbes against the cause pathogen was screened. The selected microbe showed a broad spectrum of antifungal activity, and the culture broth of this microbe had better preventive effect on Fusarium wilt than the commercial chemical agent in the pot assay. This isolated strain, GBA-12, was identified as Streptomyces kasugaensis, and the antifungal substance was purified from a broth culture of GBA-12. This purified substance was identified as a polyene macrolide (YS-822A) that was newly discovered from Streptomyces kasugaensis, and it exhibited antifungal activity against several phytopathogenic fungi.

• 한국균학회소식:학술대회논문집
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• 한국균학회 2009년도 추계학술대회 및 정기총회
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• pp.57-59
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• 2009

• Mycobiology
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• 제37권2호
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• pp.114-120
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• 2009

Streptomyces albidoflavus C247 was isolated from the soil of the Gyeongsan golf course in Korea. Physiological, biochemical and 16S rDNA gene sequence analysis strongly suggested that the isolate belonged to Streptomyces albidoflavus. Preliminary screening revealed that the isolate was active against fungi and bacteria. Self-directing optimization was employed to determine the best combination of parameters such as carbon and nitrogen source, pH and temperature. Nutritional and culture conditions for the production of antibiotics by this organism under shake-flask conditions were also optimized. Maltose (5%) and soytone (5%) were found to be the best carbon and nitrogen sources for the production of antibiotics by S. albidoflavus C247. Additionally, 62.89% mycelial growth inhibition was achieved when the organism was cultured at $30^{\circ}C$ and pH 6.5. Ethyl acetate (EtOAc) was the best extraction solvent for the isolation of the antibiotics, and 100 ${mu}$/ml of EtOAc extract was found to inhibit 60.27% of the mycelial growth of Rhizoctonia solani AG2-2(IV) when the poison plate diffusion method was conducted.

• 한국미생물·생명공학회지
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• 제21권6호
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• pp.564-569
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• 1993

AF-001A is a novel antifungal cyclic glyco-peptise isolated from Pseudomonas cepacia AF6008. AF-001A is a mixture of AF-011A1 and AF-001A2. Each compound contains glycine(1), serine(2), asparagine(1), 2,4-diaminobutyric acid(1), beta-hydroxytyrosine(1), xylose(1) and a methylene chain amino acid(1). Additionally, A1 contains one beta-hydroxyasparagine that is replaced with as asparagine in A2. AF-011A showed high in vitro antifungal activity against various animal and plant pathogenic fungi and caused no irritation on the skin of rabbits.

• 한국균학회지
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• 제23권1호통권72호
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• pp.14-27
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• 1995

32종의 한국산 버섯을 석유에테르, 80% 에탄올 및 증류수로 각각 추출하여 항진균 활성을 검색한 결과, 수원그물버섯, 거친껄껄이그물버섯, 나팔버섯, 해면버섯, 주걱간버섯 및 석이버섯의 에탄올 추출물 그리고 큰낙엽버섯의 석유에테르 추출물이 효모에 대하여 활성을 보였다. 특히 석이버섯의 에탄올 추출물은 C. neoformans균에 큰 활성을 보였으며, 그 MIC 값은 $600\;{\mu}g/ml$ 이었다. 애광대버섯, 거친껄껄이그물버섯, 나팔버섯, 해면버섯, 주걱간버섯, 큰낙엽버섯 및 석이버섯의 에탄올 추출물과 석유에테르 추출물은 곰팡이에 대하여 각각 항균활성을 보였다. 또한 나팔버섯의 에탄올 추출물은 M. gypseum균에 대하여 $1,000\;{\mu}g/ml$ 이었고, 석이버섯의 에탄올 추출물은 T. mentagrophytes, M. gypseum 및 P. oryzae균에 대하여 각각 $300\;{\mu}g/ml,\;600\;{\mu}g/ml$ 및 $600\;{\mu}g/ml$ 였으며, 이 버섯의 석유에테르 추출물은 M. gypseum균에 대하여 $300\;{\mu}g/ml$의 MIC 값을 보였다.