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Related Concept Videos

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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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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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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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Gene Regulation in Microbial Communities: Quorum Sensing01:28

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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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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Different lanthanide elements induce strong gene expression changes in a lanthanide-accumulating methylotroph.

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Bacteria can differentiate between various lanthanides (Ln), impacting their metabolism, gene expression, and accumulation. This discovery is crucial for advancing Ln recycling and circular economy applications in biometallurgy.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Environmental Science

Background:

  • Lanthanide (Ln)-dependent bacterial metabolism is significant for bio-metallurgical applications, including Ln recycling and circular economy.
  • Research has primarily focused on the presence or absence of Ln, with limited investigation into how different Ln elements affect bacterial metabolism.
  • Unexpectedly pronounced gene expression changes were observed with varying Ln supplementation.

Purpose of the Study:

  • To investigate if bacteria can distinguish between different lanthanide (Ln) elements.
  • To explore the impact of various Ln on bacterial metabolism, gene expression, and accumulation.
  • To provide insights into intracellular Ln homeostasis and microbial handling of different Ln elements.

Main Methods:

  • Bacterial strain RH AL1 was supplemented with different lanthanide (Ln) elements.
  • Gene expression analysis was performed to observe metabolic changes.
  • Ln accumulation levels were measured to understand intracellular handling and homeostasis.

Main Results:

  • Strain RH AL1 demonstrated the ability to distinguish between different Ln elements.
  • Ln supplementation significantly affected various metabolic pathways, including chemotaxis, motility, and polyhydroxyalkanoate (PHA) metabolism.
  • Distinct patterns of Ln accumulation were observed for individual Ln elements, indicating specific handling mechanisms.

Conclusions:

  • Microbes possess mechanisms to differentiate and respond distinctly to various Ln elements.
  • Understanding these microbial distinctions is essential for developing effective Ln-centered biometallurgical processes.
  • This research lays the groundwork for optimizing Ln recycling and circular economy strategies through microbial applications.