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Fosfonochlorin, a new antibiotic with spheroplast forming activity
M Takeuchi1, M Nakajima, T Ogita
1Fermentation Research Laboratories, Sankyo Co., Ltd., Tokyo, Japan.
Abstract:
A new antibiotic, fosfonochlorin, was found in the culture filtrate of four strains of fungi freshly isolated from soil samples. These strains were identified as Fusarium avenaceum, Fusarium oxysporum, Fusarium tricinctum and Talaromyces flavus. Fosfonochlorin was a low molecular weight antibiotic (MW 158), soluble in water and methanol, but insoluble in acetone, ethyl acetate and chloroform. It was named after its possession of phosphorus and chlorine atoms, each one molar in its structure. The structure was determined as chloroacetylphosphonic acid mainly by the 1H NMR and mass spectrometric analyses. It was moderately active against some species of Gram-negative bacteria and its synergistic effect with glucose-6-phosphate was observed on Staphylococcus aureus and Escherichia coli. Spheroplast formation of the susceptible organisms with this antibiotic suggested that it might inhibit their cell wall synthesis.
Insights
Scientists discovered a new antibiotic, fosfonochlorin, from soil fungi. This chloroacetylphosphonic acid shows moderate antibacterial activity and may inhibit bacterial cell wall synthesis.
Area of Science:
- Microbiology
- Natural Product Chemistry
- Medicinal Chemistry
Background:
- Soil microorganisms are a rich source of novel bioactive compounds.
- The emergence of antibiotic resistance necessitates the discovery of new antimicrobial agents.
Purpose of the Study:
- To isolate and characterize a novel antibiotic from soil-derived fungi.
- To elucidate the chemical structure and determine the antimicrobial activity of the new compound.
Main Methods:
- Fungal strains were isolated from soil samples.
- Antibiotic activity was assessed in culture filtrates.
- Chemical structure was determined using 1H NMR and mass spectrometry.
Main Results:
- Fosfonochlorin was isolated from four fungal strains, including Fusarium and Talaromyces species.
- The antibiotic has a molecular weight of 158 and is chloroacetylphosphonic acid.
- It exhibited moderate activity against Gram-negative bacteria and synergistic effects with glucose-6-phosphate against S. aureus and E. coli.
Conclusions:
- Fosfonochlorin is a novel antibiotic with potential therapeutic applications.
- Its mechanism may involve the inhibition of bacterial cell wall synthesis.
- Further research is warranted to explore its full potential and optimize its activity.