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    • 11. 发明授权
    • Enzyme induction screen for ergosterol biosynthesis inhibitors
    • 麦角甾醇生物合成抑制剂的酶诱导筛选
    • US5527687A
    • 1996-06-18
    • US68986
    • 1993-05-25
    • Donald R. KirschMargaret H. K. Lai
    • Donald R. KirschMargaret H. K. Lai
    • C12Q1/18C12Q1/26C12Q1/34C12Q1/54C12Q1/48
    • C12Q1/34C12Q1/18C12Q1/26C12Q2334/52G01N2333/395G01N2333/924Y10S435/942
    • A method for screening for sterol biosynthesis inhibitors of potential use as fungicides or antihypercholesterolemic agents identifies agents by the induction of lanosterol 14-.alpha.-demethylase, an enzyme in the biosynthetic pathway of ergosterol and cholesterol, in cultures containing the agents. In one screening test, test samples are incubated in a culture of a Saccharomyces cerevisiae strain sensitive to ergosterol biosynthesis and containing a gene fusion of a lanosterol 14-.alpha.-demethylase clone with a gene for bacterial .beta.-galactosidase. After incubation of the culture, an increase in lancsterol 14-.alpha.-demethylase activity is determined indirectly by measuring .beta.-galactosidase activity. The culture media contains a chromogenic substrate of .beta.-galactosidase such as orthonitrophenyl-.beta.-D-galactoside or 5-bromo-4-chloro-3-indoyl-.beta.-D-galactoside, so that active samples are identified by the production of colored product. For comparison purposes, screening tests may employ a lanosterol 14-.alpha.-demethylase inhibitor such as dinaconazole as a positive control.
    • 用于筛选潜在用作杀真菌剂或抗高胆固醇血症药的甾醇生物合成抑制剂的方法通过诱导羊毛甾醇14-α-甲基化酶(在麦角甾醇和胆固醇的生物合成途径中的酶)在含有该试剂的培养物中鉴定药剂。 在一次筛选试验中,将测试样品在对麦角甾醇生物合成敏感的酿酒酵母菌株的培养物中培养,并含有羊毛甾醇14-α-甲基化酶克隆与细菌β-半乳糖苷酶基因的基因融合物。 培养物培养后,通过测量β-半乳糖苷酶活性间接测定兰曲星14-α-甲基化酶活性的增加。 培养基含有β-半乳糖苷酶如邻硝基苯基-β-D-半乳糖苷或5-溴-4-氯-3-吲哚基-β-D-半乳糖苷的显色底物,使活性样品通过生产有色 产品。 为了比较目的,筛选试验可以使用羊毛甾醇14-α-甲基化酶抑制剂如依替康唑作为阳性对照。
    • 16. 发明授权
    • Sterol .DELTA.14 reductase screen
    • Sterol DELTA 14还原酶屏
    • US5591576A
    • 1997-01-07
    • US107348
    • 1993-08-16
    • Margaret H. K. LaiDonald R. KirschMartin Bard
    • Margaret H. K. LaiDonald R. KirschMartin Bard
    • C12N9/02C12N15/53C12Q1/18C12Q1/26C12N15/63C12Q1/02C12Q1/68
    • C12N9/001C12Q1/18C12Q1/26C12Y103/0107
    • A binary assay identifies agents that inhibit sterol .DELTA.14 reductase involved in ergosterol biosynthesis. In the primary screen, sterol .DELTA.14 reductase inhibition by a test sample is assayed by adding the test sample to a culture of Neurospora crassa having an erg-3 mutation and also to a culture of a strain having an erg-1 mutation, comparing the extent of growth inhibition after incubation in the two cultures, and identifying as positives those samples that show growth inhibition in the erg-3 culture exceeding that in the erg-1 culture. In the secondary screen, samples that test positive in the primary screen are reassayed by adding the test sample to a culture of a Saccharomyces cerevisiae strain into which has been introduced multiple copies of a gene encoding sterol .DELTA.14 reductase and also to a strain of S. cerevisiae that does not have the introduced gene; positive samples are identified after incubation by observation that growth inhibition in the culture having no introduced reductase gene exceeds growth inhibition in the culture having the introduced reductase gene. In preferred embodiments, a known inhibitor of sterol .DELTA.14 reductase is employed in solidified media in both the primary and the secondary screens, resulting in an assay that is highly sensitive and specific for the detection of sterol .DELTA.14 reductase inhibitors.
    • 二元测定法鉴定了抑制参与麦角固醇生物合成的甾醇DELTA14还原酶的药剂。 在主筛网中,通过将测试样品加入到具有erg-3突变的粗糙脉孢菌培养物中,并将其与具有erg-1突变的菌株的培养物进行比较,来测定测试样品的固醇DELTA 14还原酶抑制 在两种培养物中孵育后的生长抑制程度,并且鉴定出在erg-3培养物中显示生长抑制的样品超过erg-1培养物中的那些样品的阳性。 在次级屏幕中,通过将测试样品加入到已经引入了多拷贝的编码固醇DELTA14还原酶的基因的Saccharomyces cerevisiae菌株的培养物中,并且还添加到S的菌株 没有引入基因的酿酒酵母; 通过观察,通过观察到没有引入的还原酶基因的培养物中的生长抑制超过在具有引入的还原酶基因的培养物中的生长抑制的情况下,鉴定阳性样品。 在优选的实施方案中,在初级和次级筛中的固化培养基中使用已知的甾醇DELTA 14还原酶抑制剂,导致对检测固醇DELTA14还原酶抑制剂具有高度敏感性和特异性的测定。