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首页> 外文期刊>The Journal of Antibiotics: An International Journal >Structure Elucidation of New Ascomycins Produced by Genetic Engineering
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Structure Elucidation of New Ascomycins Produced by Genetic Engineering

机译:基因工程产生的新子囊霉素的结构解析

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Three new ascomycins produced by genetic engineering of Streptomyces hygroscopicus ATCC 14891 have been purified and characterized.Replacement of the 13-methoxyl group of ascomycin was accomplished by substitution of the corresponding acyltransferase domain of the polyketide synthase with a domain specific for either malonyl-CoA or methylmalonyl-CoA.The strain containing the methylmalonyl-specific acyltransferase domain produced a compound with properties consistent with those expected for 13-demethoxy-13-methylascomycin.NMR analysis revealed this material to be predominantly the cis amide rotamer,similar to ascomycin.The strain containing the malonyl-specific acyltransferase domain produced a mixture of two compounds,13-demethoxyascomycin and the 9,14-hemiacetal isomer of 13-demethoxyascomycin,in nearly equal amounts.NMR analysis revealed both compounds to be predominantly the trans amide rotamers.
机译:纯化并鉴定了由吸水链霉菌ATCC 14891的基因工程产生的三种新的子囊霉素。通过将聚酮化合物合酶的相应酰基转移酶结构域替换为丙二酰辅酶A或C特异性的结构域来完成子囊霉素的13-甲氧基的置换。甲基丙二酰辅酶A.含有甲基丙二酸特异性酰基转移酶结构域的菌株产生的化合物的性质与13-脱甲氧基-13-甲基阿霉素的预期性质一致.NMR分析表明该物质主要是顺式酰胺旋转异构体,类似于子囊霉素。含有丙二酰特异性酰基转移酶结构域的化合物以几乎相等的量生成了两种化合物的混合物,即13-脱甲氧基阿霉素和13-脱甲氧基阿霉素的9,14-半缩醛异构体。NMR分析表明,这两种化合物主要是反酰胺旋转异构体。

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