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Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

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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

25.1K
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

53.8K
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...
53.8K
Riboswitches01:56

Riboswitches

9.4K
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.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
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Video Experimental Relacionado

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Light-Controlled Fermentations for Microbial Chemical and Protein Production
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La expresión de la sintetasa de policetido modular alternativa controla la estructura de macrolactona.

Y Xue1, D H Sherman

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

Nature
|February 17, 2000
PubMed
Resumen
Este resumen es generado por máquina.

La expresión alternativa de las sintasas modulares de policetido (PKS) genera diversas estructuras de macrolactona. Este estudio revela cómo la modificación de la PKS PikAIV conduce a productos distintos de narbonolida y 10-deoximetinolida.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • Productos naturales Química Productos naturales Química

Sus antecedentes:

  • Las poliquetidas sintasas modulares (PKS) son grandes enzimas que sintetizan poliquetidas estructuralmente diversas con diversas actividades biológicas.
  • La disposición de los dominios enzimáticos dentro de los módulos de PKS dicta la estructura del producto poliquetídeo final.
  • Las policetidas son importantes productos naturales con aplicaciones en medicina e industria.

Objetivo del estudio:

  • Para investigar el impacto de la expresión alternativa de la pikromicina PKS (PikAIV) en la biosíntesis de la policetida.
  • Explorar cómo las variaciones en la expresión de PKS pueden conducir a la diversidad estructural en los productos naturales de policetida.
  • Proporcionar conocimientos sobre la relación estructura-función de los PKS modulares.

Principales métodos:

  • Se investigó la expresión alternativa del PikAIV truncado de longitud completa y amino-terminal en Streptomyces venezuelae.
  • Analizaron las estructuras de macrolactona resultantes utilizando enfoques bioquímicos y genéticos.
  • Caracterizó los productos narbonolida y 10-deoximetinolida.

Principales resultados:

  • La expresión de PikAIV de longitud completa produjo el narbonolide de macrolactona de 14 miembros.
  • La expresión de PikAIV truncado dio como resultado saltarse un ciclo de condensación, produciendo el 10-deoximetinolide de macrolactona de 12 miembros.
  • Se demostró que la expresión alternativa de PKS influye directamente en el tamaño del anillo de macrolactona.

Conclusiones:

  • La expresión alternativa del PKS modular ofrece una estrategia para generar diversidad estructural en los productos naturales poliquetídicos.
  • Los hallazgos mejoran la comprensión de los mecanismos de la línea de ensamblaje PKS y la especificidad del producto.
  • Proporciona herramientas novedosas para la biología sintética y los esfuerzos de descubrimiento de fármacos dirigidos a las policetidas.