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Repressible Operon: trp Operon01:21

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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 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

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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.
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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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Alternative modular polyketide synthase expression controls macrolactone structure.

Y Xue1, D H Sherman

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

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|February 17, 2000
PubMed
Summary
This summary is machine-generated.

Alternative expression of modular polyketide synthases (PKS) generates diverse macrolactone structures. This study reveals how modifying the PikAIV PKS leads to distinct narbonolide and 10-deoxymethynolide products.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Natural Products Chemistry

Background:

  • Modular polyketide synthases (PKS) are large enzymes synthesizing structurally diverse polyketides with various biological activities.
  • The arrangement of enzymatic domains within PKS modules dictates the final polyketide product structure.
  • Polyketides are important natural products with applications in medicine and industry.

Purpose of the Study:

  • To investigate the impact of alternative expression of the pikromycin PKS (PikAIV) on polyketide biosynthesis.
  • To explore how variations in PKS expression can lead to structural diversity in polyketide natural products.
  • To provide insights into the structure-function relationship of modular PKS.

Main Methods:

  • Investigated alternative expression of the full-length and amino-terminal truncated PikAIV in Streptomyces venezuelae.
  • Analyzed the resulting macrolactone structures using biochemical and genetic approaches.
  • Characterized the products narbonolide and 10-deoxymethynolide.

Main Results:

  • Expression of full-length PikAIV produced the 14-membered macrolactone narbonolide.
  • Expression of truncated PikAIV resulted in skipping a condensation cycle, yielding the 12-membered macrolactone 10-deoxymethynolide.
  • Demonstrated that alternative PKS expression directly influences macrolactone ring size.

Conclusions:

  • Alternative expression of modular PKS offers a strategy to generate structural diversity in polyketide natural products.
  • Findings enhance understanding of PKS assembly line mechanisms and product specificity.
  • Provides novel tools for synthetic biology and drug discovery efforts targeting polyketides.