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Isolation of a new polyether antibiotic, lonomycin

S Omura, M Shibata, S Machida

The Journal of Antibiotics

|January 1, 1976

Summary

Researchers discovered a new polyether antibiotic, lonomycin, from Streptomyces ribosidifcus. This compound exhibits antimicrobial activity against gram-positive bacteria, offering potential for new therapeutic applications.

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Area of Science:

Microbiology
Natural Products Chemistry

Background:

Streptomyces species are a prolific source of bioactive natural products.
The discovery of novel antibiotics is crucial for combating antimicrobial resistance.

Purpose of the Study:

To isolate and characterize a new antibiotic from Streptomyces ribosidifcus.
To evaluate the antimicrobial spectrum of the novel compound.

Main Methods:

Isolation of the antibiotic from microbial culture broth.
Physicochemical characterization using spectroscopy (IR, NMR) and melting point determination.
Antimicrobial activity testing against various bacterial strains.

Main Results:

A new polyether antibiotic, lonomycin (sodium salt), was isolated.
Lonomycin is a colorless prism with molecular formula C44H75O14Na, M.W. 850, and melting point 188-189°C.
Spectroscopic data indicated the presence of carboxyl and four methoxyl groups; no UV absorption maxima were observed.
Lonomycin demonstrated antimicrobial activity against gram-positive bacteria.

Conclusions:

Lonomycin is a novel polyether antibiotic with potential antimicrobial applications.
Further investigation into lonomycin's structure and mechanism of action is warranted.

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