[Compatibility groups of metabolic plasmids (author's transl)]

Area of Science:

• Bacteriology
• Molecular Biology
• Genetics

Background:

• Plasmids play crucial roles in bacterial adaptation and evolution.
• Understanding plasmid compatibility is essential for their classification and use in genetic studies.
• Metabolic characters encoded by plasmids can serve as taxonomic markers.

Purpose of the Study:

• To determine the compatibility groups of eleven naturally occurring plasmids.
• To investigate the relationship between plasmid-encoded metabolic functions and their compatibility.
• To assess the utility of these plasmids in bacterial taxonomy and plasmid classification.

Main Methods:

• Isolation of eleven plasmids from naturally occurring bacterial strains.
• Determination of plasmid-encoded metabolic characters (lactose fermentation, sucrose fermentation, haemolysin production, chloramphenicol resistance).
• Analysis of plasmid compatibility using established methods and reference plasmids from known groups.

Main Results:

• Seven plasmids determined lactose fermentation; two were fi+ (one in group FI, one novel), and five were fi-.
• Two plasmids determined sucrose fermentation, both fi- (one in group H, one compatible with all groups).
• Two plasmids determined haemolysin production; one was fi+ (group FIII), and one was fi- (group I2).
• One fi- plasmid conferring chloramphenicol resistance belonged to group H.
• Several plasmids were compatible with all recognized groups, indicating potential for novel classifications.

Conclusions:

• Plasmids encoding specific metabolic traits can be assigned to known compatibility groups or novel ones.
• Compatibility grouping of plasmids based on metabolic characters is a viable approach for plasmid classification.
• Plasmids with known compatibility groups and metabolic functions are valuable tools for classifying antibiotic resistance plasmids.