Genetic insights into pyralomicin biosynthesis in Nonomuraea spiralis IMC A-0156.

Genetic insights into pyralomicin biosynthesis in Nonomuraea spiralis IMC A-0156.
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对Nonomuraea spiralis imc A-0156中黄毛质素生物合成的遗传见解。

DOI:
10.1021/np400159a
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发表时间:
2013-05-24
影响因子:
5.1
通讯作者:
Mahmud T
Mahmud T
中科院分区:
生物学2区
文献类型:
--
作者:
Flatt PM;Wu X;Perry S;Mahmud T

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吡咯霉素抗生素的生物合成基因簇已从 Nonomuraeaspiralis IMC A-0156 中克隆并测序。 41 kb 基因簇包含 27 个 ORF,预计编码 Pyralomicin 生物合成的所有功能。这包括形成苯并吡喃吡咯核心单元所需的非核糖体肽合成酶 (NRPS) 和聚酮合酶 (PKS),以及进一步修饰核心结构所需的一套剪裁酶(例如,四种卤化酶、一种 O-甲基转移酶和一种 N-糖基转移酶)。 N-糖基转移酶预计将葡萄糖或假糖(环糖醇)转移至糖苷配基。在苯并吡喃吡咯特异性 ORF 的上游鉴定出编码 C7-环醇生物合成酶的基因盒。靶向破坏编码 N-糖基转移酶 prlH 的基因,消除吡咯霉素的产生和 PrlA 的重组表达,证实了该酶作为参与 C7-环醇部分形成的糖磷酸环化酶 (SPC) 的活性。
The biosynthetic gene cluster for the pyralomicin antibiotics has been cloned and sequenced from Nonomuraea spiralis IMC A-0156. The 41-kb gene cluster contains 27 ORFs predicted to encode all of the functions for pyralomicin biosynthesis. This includes non-ribosomal peptide synthetases (NRPS) and polyketide synthases (PKS) required for the formation of the benzopyranopyrrole core unit, as well as a suite of tailoring enzymes (e.g., four halogenases, an O-methyltransferase, and an N-glycosyltransferase) necessary for further modifications of the core structure. The N-glycosyltransferase is predicted to transfer either glucose or a pseudosugar (cyclitol) to the aglycone. A gene cassette encoding C7-cyclitol biosynthetic enzymes was identified upstream of the benzopyranopyrrole-specific ORFs. Targeted disruption of the gene encoding the N-glycosyltransferase, prlH, abolished pyralomicin production and recombinant expression of PrlA confirms the activity of this enzyme as a sugar phosphate cyclase (SPC) involved in the formation of the C7-cyclitol moiety.
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期刊: ORGANIC LETTERS
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