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Bacillus licheniformis EMR-1에서의 MLS 유도내성 기전 -erm K의 크로닝-
최응칠,곽진환,B.와이스브럼,Choi, Eung-Chil,Kwak, Jin-Hwan,Weisblum, Bernard 대한약학회 1988 약학회지 Vol.32 No.4
Inducible MLS resistance gene of Bacillus licheniformis specified by erm K was subcloned in Bacillus subtilis and the DNA sequence corresponding to its control region was determined. The determinant erm K was in Pvu II=Hind III fragment, which was 1.3 kb. The leader region is capable of forming a complex series of inverted complementary repeat sequences (ICRS) centering on at least six axes of symmetry, some of them mutually exclusive, in a way that resulted ultimately in post-transcriptional unmasking of the ribosome loading site for methylase synthesis.
리팜피신에 내성인 Streptococcus faecalis 균주의 개발
최응칠(Eung Chil Choi),김승호(Seung Ho Kim),권애란(Ae Ran Kwon),이미정(Mi Jeong Lee),오정자(Jeong Ja Oh),김병각(Byong Kak Kim) 대한약학회 1993 약학회지 Vol.37 No.4
The preparation of Streptococcus faecalis RSI is used as a medicinal preparation for human intestinal disorders. But the microbe in this preparation is very sensitive to rifampicin. If this preparation is taken with rifampicin, its therapeutic effect can not be expected. To develope rifampicin resistant mutants, the rifampicin sensitive strain S. faecalis RSI was treated with N-methyl-N''-nitro-N-nitrosoguanidine(MNNG). Twelve strains of the MNNG-induced mutants showed distinct resistance to rifampicin and five mutants were selected for further studies. They also exhibited identical characteristics with the parent S. faecalis RSI when they were tested for lactic acid formation and growth inhibition of E. coli. From in vitro test, it was identified that rifampicin is not inactivated by certain factors of the rifampicin resistant mutants. Conclusively, the rifampicin resistant mutants are efficient strains that have insensitivity against rifampicin and original biochemical characteristics of the parent strain.
최응칠(Eung Chil Choi),김병각(Byong Kak Kim),정경수(Kyeong Soo Chung) 대한약학회 1988 약학회지 Vol.32 No.5
394 strains of soil microorganism were isolated from the Korean soil samples. The isolated strains were shake-cultured in oat-meal medium. The filtrates of the cultures were screened for the production of alpha-amylase inhibitors. Five strains were identified to produce alpha-amylase inhibitors. And these strains were identified as Actinomycetes.
Bacillus licheniformis EMR 균주에서 린코사마이드계 항생물질에 의한 유도내성
최응칠(Eung Chil Choi),우정원(Jung Won Woo),B. 와이스브럼(Bernard Weisblum) 대한약학회 1986 약학회지 Vol.30 No.6
To clarify resistance mechanisms of lincosamide antibiotics, it was examined whether lincosamide antibiotics was able to induce high resistance to macrolide and lincosamide antibiotics against EMR-1 strain of Bacillus species. And it was also examined whether the inducible resistance was plasmid-mediated or chromosome-mediated. This strain was identified as Bacillus licheniformis by its morphological and physiological characteristics. The subinhibitory concentrations of lincomycin and clindamycin induced high resistance in the strain to lincosamide antibiotics, but not to macrolide antibiotics. The inducible resistance was not eliminated by treating the strain with ethidium bromide, and plasmid was not identified by the alkaline lysis method of plasmid preparation. These results indicate, therefore, that the inducible resistance to macrolide and lincosamide antibiotics in the strain may be chromosome-mediated, not plasmid-mediated.
한국산 생약자원 개발연구 (제2보) : prunus tomentosa의 약효성분에 관하여
최응칠(Eung-Chil Choi),한대석(Dae-Suk Han),김영호(Young-Ho Kim),홍인혁(In-Hyuk Hong) 한국생약학회 1983 생약학회지 Vol.14 No.2
HPLC is a useful method for identifying amygdalin which has been the subject of considering controversy for cancer remedy. The resolution of amygalin was satisfactory and the separation of amygdalin was accomplished using carbohydrate analysis column, mobile phase of acetonitrile: H₂O (90 : 10), and UV detector. Quantitative analysis showed that amygdalin contents of Prunus tomentosa, P. serrulata, and P. ishidoyana(Amygdalaceae) were 2.18, 2.41, and 2.26%, respectively. It was suggested that the seed of Prunus species was worth useful resource of amygdalin.
리팜피신에 내성인 Bifidobacterium bifidum 균주개발
최응칠(Eung Chil Choi),고성열(Sung Youl Ko),김희선(Hee Sun Kim),최성숙(Sung Sook Choi),김숙경(Sook Kyung Kim),김병각(Byoung Kak Kim) 대한약학회 1993 약학회지 Vol.37 No.5
Bifidobacterium bifidum, one strain of medical preparations being on the market for human intestinal disorder, is very sensitive to rifampicin. If this preparation is taken with rifampicin, its therapeutic effect can't be expected. To develope rifampicin resistant mutants, B. bifidum was treated with N-methyl-N''-nitro-N-nitrosoguanidine(MNNG). All of thirty strains grown on the plates containing 10 mcg/ml rifampicin were over 1,000 times more resistant to rifampicin than parental strain and they were identified as B. bifidum by fructose-6-phosphoate phosphoketolase test. Three strains out of thirty, which produced almost same amount of organic acid as parental strain, were selected for further studies. They showed identical growth inhibition activity aganist E. coli compared with that of parental strain. And rifampicin was not inactivated.
한국산 고등균류의 성분 연구(Ⅳ) : Lactarius Piperatus (Fr.) S.F. Gray로 부터 Gultorin 의 분리
최응칠(Eung Chil Choi),김병각(Byong Kak Kim) 한국생약학회 1975 생약학회지 Vol.6 No.1
In order to isolate constituents of Lactarius piperatus(FR.) S.F. GRAY, the fresh carpophore was homogenized with ethanol in a blendor, stored for three years and subsequently extracted with ethanol. From the concentrated ethanol solution, a mixture of compounds was precipitated, from which a white needle crystal, named gultorin, (mp.160∼162°) was obtained. The physical and chemical characteristics of gultorin were determined.
맥각균의 배양에 관한 연구 ( 3 ) 발효조에서의 Lysergic Acid 알칼로이드의 생성
김병각,옥선,최응칠 ( Byong Kak Kim,Sun Auck,Eung Chil Choi ) 생화학분자생물학회 1973 BMB Reports Vol.6 No.3
Ergot fungus was culitvated in stirred fermentors in various modified conditions to investigate their influence on the production of lysergic acid alkaloids. Claviceps paspali Stevens and Hall Isolate No. 31 was cultured in mannitol-succinate medium of Schwarting, et al., and such modifications as additions of Tween 80, oxygen gas, dimethylsulfoxide, arsenate and the utilization of sorbitol-fumaric acid medium and propeller-type impellers were respectively examined. Quantitative determination of the total alkaloids was carried out using Michelon-Kelleher method. The results showed that additions of oxygen gas, dimethylsulfoxide, arsenate, and the utilization of sorbitol-fumaric acid medium increased the production of the alkaloids. However, the addition of Tween 80 caused extensive foaming and resulted in decrease of the alkaloid accumulation.