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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Cationic Anthraquinone Analogs as Selective Antimicrobials.

Yagya Prasad Subedi1, Cheng-Wei Tom Chang1

  • 1Department of Chemistry & Biochemistry, Utah State University, Logan, UT, USA.

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|June 18, 2019
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Summary

New antimicrobial cationic anthraquinone analogs (CAAs) show promise for fighting drug-resistant bacteria. The lead CAA effectively targets methicillin-resistant Staphylococcus aureus (MRSA) with low impact on beneficial gut bacteria and human cells.

Keywords:
Clostridium difficile infectionantibioticcationic anthraquinone analogscytotoxicitymethicillin-resistant Staphylococcus aureusvancomycin-resistant Staphylococcus aureus

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Drug Discovery

Background:

  • The rise of multidrug-resistant bacteria, including Gram-negative pathogens like Escherichia coli and Klebsiella pneumoniae, necessitates novel antibiotic development.
  • Broad-spectrum antibiotics, while crucial, can disrupt gut microbiota, increasing risks of Clostridium difficile infection (CDI).
  • Existing treatments for Gram-positive infections, such as vancomycin for MRSA, face challenges from emerging resistance (e.g., VRSA).

Purpose of the Study:

  • To explore the potential of antimicrobial cationic anthraquinone analogs (CAAs) as selective antimicrobial agents.
  • To evaluate the activity and selectivity profile of a lead CAA compound.
  • To assess the compound's efficacy against resistant Gram-positive bacteria and its safety towards Gram-negative bacteria and mammalian cells.

Main Methods:

  • Synthesis and characterization of antimicrobial cationic anthraquinone analogs (CAAs).
  • In vitro testing of CAA activity against clinically relevant bacterial strains, including MRSA and E. coli.
  • Cytotoxicity assays to evaluate the effect of CAAs on normal mammalian cells.

Main Results:

  • The lead CAA demonstrated potent activity against methicillin-resistant Staphylococcus aureus (MRSA).
  • The compound exhibited significantly lower activity against Gram-negative Escherichia coli.
  • Low cytotoxicity was observed towards normal mammalian cells, indicating a favorable safety profile.

Conclusions:

  • Antimicrobial cationic anthraquinone analogs (CAAs) represent a promising new class of selective antimicrobials.
  • The lead CAA's targeted activity against MRSA and low mammalian cell toxicity offer a potential alternative to broad-spectrum agents.
  • Further research into CAAs could lead to novel therapeutic strategies against resistant bacterial infections.