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Related Concept Videos

Inhibitors of Gram-positive Cell Wall Synthesis01:23

Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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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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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...
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Antimicrobial Proteins01:23

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Citreamicins with potent gram-positive activity.

D Craig Hopp1, Dennis J Milanowski, Joshua Rhea

  • 1AMRI, Bothell Research Center, 18804 North Creek Parkway, Bothell, Washington 98011, USA.

Journal of Natural Products
|December 5, 2008
PubMed
Summary

Two novel xanthone antibiotics, citreamicin delta and epsilon, show potent activity against Gram-positive pathogens, including multidrug-resistant Staphylococcus aureus (MDRSA). These compounds, isolated from Streptomyces vinaceus, offer promising therapeutic potential for combating resistant bacterial infections.

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Area of Science:

  • Microbiology
  • Natural Product Chemistry
  • Pharmacology

Background:

  • Gram-positive pathogens, particularly multidrug-resistant Staphylococcus aureus (MDRSA), pose a significant global health threat.
  • The discovery of novel antibiotics is crucial to overcome existing antimicrobial resistance.
  • Xanthone derivatives are a class of natural products with diverse biological activities.

Purpose of the Study:

  • To discover and characterize new antibiotic compounds from microbial sources.
  • To evaluate the antimicrobial activity of novel xanthones against Gram-positive pathogens, including MDRSA.
  • To elucidate the chemical structures of the newly identified compounds.

Main Methods:

  • Isolation of compounds from EtOAc extracts of Streptomyces vinaceus.
  • Purification using countercurrent chromatography and reversed-phase High-Performance Liquid Chromatography (HPLC).
  • Structure elucidation employing Nuclear Magnetic Resonance (NMR) spectroscopy and mass spectrometry.

Main Results:

  • Discovery of two new xanthone antibiotics, citreamicin delta (1) and citreamicin epsilon (2).
  • Compounds 1 and 2 demonstrated potent activity against Gram-positive pathogens, with Minimum Inhibitory Concentration (MIC) values < 1 microg/mL against several resistant strains, including MDRSA.
  • The structures of compounds 1 and 2 were successfully elucidated.

Conclusions:

  • Citreamicin delta and epsilon are novel xanthone antibiotics with significant potential for treating infections caused by Gram-positive pathogens.
  • These compounds represent promising candidates for further development to combat antimicrobial resistance.
  • The study highlights the value of natural product discovery from Streptomyces species for novel drug development.