• Journal of Plant Biology
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• 제16권1_2호
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• pp.12-16
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• 1973

The inhibitory effect of Inula sesquiterpene lactones on the growth of Phaseolus vulgaris was tested and the abnormality of the stem organization caused by the lactones was also examined. The longitudinal growth of the young stem and the expansion of the young leaf were stopped by the application of the lactones. However, this inhibitory effect was appeared and strictly restricted within the treated area. So the young shoot was observed for possible bending as a result of the unilateral application of the lactones. When the application of the lactones into the medium, the growth of the plant was entirely repressed. However, the growth of shoot and re-initiation of root were started after the plant was transfered to the lactone free medium. And partial reversal of inhibition of the stem growth was achieved by the additions of gibberelline and the lactones.

• Applied Biological Chemistry
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• 제38권3호
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• pp.269-272
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• 1995

산국과 감국의 용매분획물과 sesquiterpenoid lactones, Compound I, II를 4종의 미생물에 대하여 항균실험을 하였다. 이 중에서 산국의 chloroform분획과 sesquiterpenoid lactones, Compound I에서 B. subtilis과 V. parahaemolyticus에 대하여 항균력이 있었다. 그리고 야생감국의 chloroform분획과 sesquiterpenoid lactones 에서는 항균력이 산국보다 약하게 나타났으며, Compound II와 재배감국의 모든 분획은 미생물에 대하여 항균력이 전혀 나타나지 않았다.

• Archives of Pharmacal Research
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• 제17권5호
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• pp.327-330
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• 1994

Bromolactonization of 2-substituted-1-cyclohexenyl-1-acetic acids with 1, 3-dibromo-5, 5-dime-thylhydantoin 9DBH) and potsssium tertiary butoxide (t-BuOK0 in anhydrous DMF was found to proceed in a highly regioselective manner. The reaction predominantly resulted in the formation of ${\betha}-lactones$ (greater than 96%).

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.369.1-369.1
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• 2002

In our previous study, the leaves of Ixeris sonchifolia afforded two new and two known guaiane type sesquiterpene lactones by activity-guided fractionation. Now we report additional isolation of sesquiterpene lactones from the roots of Ixeris sanchi!a!ia. They are glucozaluzanin C and ixerin H. Ixerin H is germacranolide type sesquiterpene glucuside. Theil structures were determined by 1 D and 2D NMR spectroscopy. (omitted)

• Bulletin of the Korean Chemical Society
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• 제23권3호
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• pp.365-366
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• 2002

• Bulletin of the Korean Chemical Society
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• 제23권10호
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• pp.1375-1376
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• 2002

• Molecules and Cells
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• 제28권5호
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• pp.447-453
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• 2009

The quorum sensing (QS) inhibitors that antagonize TraR, a receptor protein for N-3-oxo-octanoyl-L-homoserine lactones (3-oxo-C8-HSL), a QS signal of Agrobacterium tumefaciens were developed. The structural analogues of 3-oxo-C8-HSL were designed by in silico molecular modeling using SYBYL packages, and synthesized by the solid phase organic synthesis (SPOS) method, where the carboxamide bond of 3-oxo-C8-HSL was replaced with a nicotinamide or a sulfonamide bond to make derivatives of N-nicotinyl-L-homoserine lactones or N-sulfonyl-L-homoserine lactones. The in vivo inhibitory activities of these compounds against QS signaling were assayed using reporter systems and compared with the estimated binding energies from the modeling study. This comparison showed fairly good correlation, suggesting that the in silico interpretation of ligand-receptor structures can be a valuable tool for the pre-design of better competitive inhibitors. In addition, these inhibitors also showed anti-biofilm activities against Pseudomonas aeruginosa.

• Bulletin of the Korean Chemical Society
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• 제25권1호
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• pp.136-138
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• 2004

• Bulletin of the Korean Chemical Society
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• 제25권11호
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• pp.1729-1732
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• 2004

• Journal of Microbiology and Biotechnology
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• 제19권10호
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• pp.1142-1149
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• 2009

Several bioactive metabolites, including pyrrolnitrin, N-acylhomoserine lactones, and polyhydroxyalkanoates were isolated from Burkholderia sp. O33. Effects of various nutrients, including sugars, gluconolactone, glycerol, tryptophan, chloride, and zinc were investigated in relation to the production of these metabolites. Logarithmic increase of pyrrolnitrin was observed between 2-5 days and reached a maximum at 7-10 days. Tryptophan concentration reached the maximum at 3 days, whereas 7-chlorotryptophan was gradually increased throughout the studies. Among various carbon sources, gluconolactone, trehalose, and glycerol enhanced pyrrolnitrin production, whereas strong inhibitory effects were found with glucose. Relative concentrations of pyrrolnitrin and its precursors were in the order of pyrrolnitrin$\gg$dechloroaminopyrrolnitrin or aminopyrrolnitrin throughout the experiments. Among three N-acylhomoserine lactones, the N-octanoyl analog was the most abundant quorum sensing signal, of which the concentrations reached the maximum in 2-3 days, followed by a rapid dissipation to trace level. No significant changes in pyrrolnitrin biosynthesis were observed by external addition of N-acylhomoserine lactones. Polyhydroxyalkanoates accumulated up to 3-4 days and decreased slowly thereafter. According to the kinetic analyses, no strong correlations were found between the levels of pyrrolnitrin, N-acylhomoserine lactones, and polyhydroxyalkanoates.