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相关概念视频

Repressible Operon: trp Operon01:21

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The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
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Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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Operon Model01:23

Operon Model

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The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
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Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
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Operons02:09

Operons

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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
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Riboswitches01:56

Riboswitches

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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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Light-Controlled Fermentations for Microbial Chemical and Protein Production
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替代的模块化聚基酸合成酶表达控制 宏乐拉克结构

Y Xue1, D H Sherman

  • 1Department of Microbiology and Biological Process Technology Institute, University of Minnesota, Minneapolis 55455, USA.

Nature
|February 17, 2000
PubMed
概括
此摘要是机器生成的。

模块化多基合成酶 (PKS) 的替代表达产生了多种多样化的巨乳素结构. 这项研究揭示了如何修改PikAIV PKS导致不同的纳博诺利德和10-脱氧甲基诺利德产物.

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From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
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科学领域:

  • 生物化学 生物化学
  • 分子生物学分子生物学
  • 自然产品 化学 化学

背景情况:

  • 模块化多基酸合成酶 (PKS) 是大型酶,可以合成具有各种生物活动的结构多样化的多基酸.
  • 在PKS模块内酶域的排列决定了最终的多基化物产品结构.
  • 聚基化物是重要的天然产品,在医学和工业中具有应用.

研究的目的:

  • 调查皮克罗米PKS (PikAIV) 的替代表达对多基基生物合成的影响.
  • 探索PKS表达的变化如何导致多基化天然产品的结构多样性.
  • 为模块化PKS的结构-功能关系提供见解.

主要方法:

  • 在Streptomyces venezuelae中研究了全长和氨基末端截断PikaIV的替代表达.
  • 通过生物化学和遗传方法分析了由此产生的巨乳素结构.
  • 描述了这些产品narbonolide和10-deoxymethynolide.

主要成果:

  • 全长PikAIV的表达产生了14个成员的麦克罗拉克纳博诺利德.
  • 截断的PikAIV的表达导致跳过一个凝结周期,产生12个成员的麦克罗拉克10-脱氧甲基诺化物.
  • 证明了替代PKS表达直接影响巨乳素环大小.

结论:

  • 模块化PKS的替代表达方式提供了一种策略,可以在多基化天然产品中产生结构多样性.
  • 这些发现提高了对PKS装配线机制和产品特异性的理解.
  • 为合成生物学和药物发现努力提供了针对多基类的新工具.