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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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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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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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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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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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Characterizing the Staphylococcus aureus fatty acid degradation operon.

Cindy Menjivar1, Zachary R DeMars1, Richard E Wiemels2

  • 1Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, Kansas, USA.

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Staphylococcus aureus possesses a functional fatty acid degradation pathway, previously thought absent. This pathway is regulated by catabolite repression, impacting fatty acid metabolism in this bacterium.

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CcpAFadBMRSAbeta-oxidationfatty acid

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Staphylococcus aureus utilizes fatty acid synthesis (FASII) and can import exogenous fatty acids via the fatty acid kinase (Fak) complex.
  • The bacterium was previously believed to lack a functional fatty acid degradation (Fad) pathway, with studies suggesting the absence of a crucial crotonase domain in its FadB protein.
  • Limited prior research and potential misannotations contributed to the assumption that Staphylococcus aureus could not degrade fatty acids.

Purpose of the Study:

  • To investigate the presence and functionality of a fatty acid degradation (Fad) pathway in Staphylococcus aureus.
  • To identify the regulatory mechanisms governing the expression of the putative Fad pathway genes.
  • To challenge the long-held belief that Staphylococcus aureus lacks the capacity for fatty acid degradation.

Main Methods:

  • mRNA analysis was employed to confirm the existence of the fadXDEBA operon as a single polycistronic mRNA.
  • Promoter identification and analysis revealed a putative binding site for the Carbon Catabolite Protein A (CcpA) regulator.
  • Complementation assays in E. coli fad mutants using Staphylococcus aureus fadBA genes were performed to assess protein functionality.

Main Results:

  • The fadXDEBA operon was confirmed to be transcribed as a single mRNA unit.
  • Expression of the fadXDEBA operon was found to be under strong catabolite repression, particularly in the presence of glucose, and derepressed in the absence of glucose or CcpA.
  • Complementation assays demonstrated that Staphylococcus aureus FadB possesses a functional crotonase domain, essential for restoring growth of E. coli fad mutants.

Conclusions:

  • Staphylococcus aureus possesses a functional fatty acid degradation (Fad) pathway, contrary to previous assumptions.
  • The fadXDEBA operon is subject to significant catabolite repression by CcpA, explaining its previously undetected activity.
  • These findings necessitate a revised understanding of fatty acid metabolism in Staphylococcus aureus, integrating both synthesis and degradation pathways.