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首页> 外文期刊>The Journal of Antibiotics: An International Journal >Involvement of Glutamate Mutase in the Biosynthesis of the Unique Starter Unit of the Macrolactam Polyketide Antibiotic Vicenistatin
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Involvement of Glutamate Mutase in the Biosynthesis of the Unique Starter Unit of the Macrolactam Polyketide Antibiotic Vicenistatin

机译:谷氨酸突变酶参与Macrolactam聚酮化合物抗生素Visnistatin的独特起始单元的生物合成。

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摘要

The macrolactam antibiotic vicenistatin,produced in Streptomyces halstedii HC34,is biosynthesized by the polyketide pathway,using a unique 3-methylaspartate-derived molecule as starter unit.The vinI gene in the vicenistatin biosynthetic gene cluster encoding glutamate mutase,which rearranges glutamate to 3-methylaspartate,was disrupted.The vinI disruption completely abolished the production of vicenistatin,while the dismptant recovered the production of vicenistatin when 3-methylaspartate was added to the culture.These results indicate that vinI is essential for the 3-methylaspartate formation in the vicenistatin biosynthesis.Furthermore,the mutant accumulated new vicenistatin derivatives (desmethylvicenistatins),which lacked a methyl group in the starter unit.The desmethylvicenistatins were shown by feeding experiments to be derived from aspartate instead of 3-methylaspartate as the starter unit.These results indicate that the vicenistatin polyketide synthase can accept alternative starter units toward the production of novel polyketides.
机译:halstedii HC34链霉菌中产生的大内酰胺抗生素抗维他汀是通过聚酮化合物途径生物合成的,使用独特的3-甲基天门冬氨酸衍生的分子作为起始单元。天冬氨酸甲酯被破坏。vinI破坏完全消除了总维斯汀的产生,而当添加3-甲基天门冬氨酸的培养液时,分离剂恢复了维斯汀的产生。这些结果表明,vinI对于维他汀生物合成中3-甲基天冬氨酸的形成至关重要。此外,该突变体积累了新的维斯他汀衍生物(去甲基维斯他汀),其起始单元中没有甲基。通过进料实验表明去甲基维斯他汀衍生自天门冬氨酸而不是3-甲基天冬氨酸作为起始单元。这些结果表明Vicenistatin聚酮化合物合酶可以接受替代的st Arter公司致力于生产新型聚酮化合物。

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