Characterization and replication control of plasmids from Enterobacter cloacae DF 13

Area of Science:

• Microbiology
• Molecular Biology
• Bacteriology

Background:

• Enterobacter cloacae DF13 possesses multiple plasmids, including a large R factor and a bacteriocinogenic factor.
• Previous work identified cryptic plasmids of varying sizes (1.3, 2.8, and 8.0 x 10^6 Mr).

Purpose of the Study:

• To determine the homogeneity and molecular relatedness of mini (1.3 x 10^6 Mr) and midi (2.8 x 10^6 Mr) cryptic plasmids.
• To analyze the maxi (6.0 x 10^6 Mr) bacteriocinogenic factor.
• To investigate the replication kinetics and control mechanisms of these plasmids, particularly under protein synthesis inhibition.

Main Methods:

• Plasmid DNA isolation and characterization.
• Molecular hybridization techniques to assess relatedness.
• Replication studies under varying conditions, including protein synthesis inhibition.

Main Results:

• Characterization of the molecular relationships between mini and midi cryptic plasmids.
• Analysis of the bacteriocinogenic factor's properties.
• Data on replication kinetics and control mechanisms, including response to protein synthesis inhibition.

Conclusions:

• The study elucidates the molecular relationships and replication dynamics of specific plasmids in Enterobacter cloacae DF13.
• Understanding these plasmid characteristics is crucial for comprehending bacterial genetics and evolution.