首页> 美国卫生研究院文献>Journal of Bacteriology >Occurrence of Two 5-Aminolevulinate Biosynthetic Pathways in Streptomyces nodosus subsp. asukaensis Is Linked with the Production of Asukamycin
【2h】

Occurrence of Two 5-Aminolevulinate Biosynthetic Pathways in Streptomyces nodosus subsp. asukaensis Is Linked with the Production of Asukamycin

机译:结节链霉菌亚种中两个5-氨基乙酰丙酸酯生物合成途径的发生。明日香与明日霉素的生产有关

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

We report the results of cloning genes for two key biosynthetic enzymes of different 5-aminolevulinic acid (ALA) biosynthetic routes from Streptomyces. The genes encode the glutamyl-tRNAGlu reductase (GluTR) of the C5 pathway and the ALA synthase (ALAS) of the Shemin pathway. While Streptomyces coelicolor A3(2) synthesizes ALA via the C5 route, both pathways are operational in Streptomyces nodosus subsp. asukaensis, a producer of asukamycin. In this strain, the C5 route produces ALA for tetrapyrrole biosynthesis; the ALA formed by the Shemin pathway serves as a precursor of the 2-amino-3-hydroxycyclopent-2-enone moiety (C5N unit), an antibiotic component. The growth of S. nodosus and S. coelicolor strains deficient in the GluTR genes (gtr) is strictly dependent on ALA or heme supplementation, whereas the defect in the ALAS-encoding gene (hemA-asuA) abolishes the asukamycin production in S. nodosus. The recombinant hemA-asuA gene was expressed in Escherichia coli and in Streptomyces, and the encoded enzyme activity was demonstrated both in vivo and in vitro. The hemA-asuA gene is situated within a putative cluster of asukamycin biosynthetic genes. This is the first report about the cloning of genes for two different ALA biosynthetic routes from a single bacterium.
机译:我们报告了从链霉菌的不同5-氨基乙酰丙酸(ALA)生物合成途径的两个关键生物合成酶的克隆基因的结果。这些基因编码C5途径的谷氨酰-tRNA Glu 还原酶(GluTR)和Shemin途径的ALA合酶(ALAS)。虽然coelicolor链霉菌A3(2)通过C5途径合成ALA,但两种途径均在结节链霉菌亚种中起作用。明日香,明日霉素的生产商。在该菌株中,C5途径产生了用于四吡咯生物合成的ALA。由Shemin途径形成的ALA用作2-氨基-3-羟基环戊-2-烯酮部分(C5N单元)(抗生素组分)的前体。缺乏GluTR基因(gtr)的诺氏链球菌和天蓝色链霉菌的生长严格依赖于ALA或血红素的补充,而ALAS编码基因(hemA-asuA)的缺陷消除了诺氏链球菌中的日光霉素生产。 。重组hemA-asuA基因在大肠杆菌和链霉菌中表达,并且在体内和体外均显示出编码的酶活性。 hemA-asuA基因位于推测的明矾生物合成基因簇中。这是有关从单个细菌克隆两种不同ALA生物合成途径的基因的第一份报告。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号