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Fluviols, bicyclic nitrogen-rich antibiotics produced by Pseudomonas fluorescens
V V Smirnov1, E A Kiprianova, A D Garagulya
1Zabolotny Institute of Microbiology and Virology of Ukrainian Academy of Sciences, Kiev, Ukraine.
FEMS Microbiology Letters
|August 15, 1997
Summary
Researchers identified novel fluorescent pseudomonads from plant roots, similar to Pseudomonas fluorescens. These strains produce unique fluviol antibiotics with potential antimicrobial and antitumour activities.
Area of Science:
- Microbiology
- Biochemistry
Background:
- Fluorescent pseudomonads are common soil bacteria associated with plant roots.
- Pseudomonas fluorescens is a well-characterized species with diverse ecological roles.
Purpose of the Study:
- To characterize novel fluorescent pseudomonads isolated from agricultural plant rhizospheres.
- To investigate the genetic relatedness of these isolates to known Pseudomonas fluorescens biovars.
- To isolate and characterize novel antibiotic compounds produced by these strains.
Main Methods:
- Phenotypic characterization of bacterial isolates.
- DNA-DNA hybridization for genetic similarity assessment.
- Chemical isolation and structural elucidation of antibiotic compounds.
- Antimicrobial and antitumour activity assays.
Main Results:
- Fifteen fluorescent pseudomonad isolates exhibited phenotypic and pigment similarities to Pseudomonas fluorescens var. pseudoiodinum.
- DNA-DNA hybridization confirmed genetic similarity, but not identity, to various Pseudomonas fluorescens biovars.
- A novel family of antibiotics, fluviols (pyrazolo-[4,3-e]as-triazine derivatives), was isolated.
- Fluviols demonstrated significant antimicrobial and antitumour activities.
Conclusions:
- The isolated pseudomonads represent a distinct group genetically related to Pseudomonas fluorescens.
- The novel fluviol antibiotics possess promising antimicrobial and antitumour properties warranting further investigation.