[Use of the plasmid R89S replicon for constructing integration vectors]

Area of Science:

• Microbiology
• Molecular Biology
• Bacteriology

Context:

• Plasmid R89S derivatives function as integrative vectors in bacteria lacking autonomous replication.
• Phototrophic bacterium Rhodobacter sphaeroides chromosomal and plasmid fragments were targeted for cloning.

Purpose:

• To assess the utility of R89S-derived plasmids as integrative vectors for Rhodobacter sphaeroides.
• To clone and mobilize Rhodobacter sphaeroides DNA fragments into the bacterium using a conjugative plasmid.

Summary:

• Chromosomal and plasmid fragments of Rhodobacter sphaeroides were cloned into pVZ365, an R89S derivative.
• Recombinant plasmids were mobilized into R. sphaeroides using the conjugative plasmid R751, achieving significant conjugation frequencies.
• The study demonstrated successful integration of recombinant molecules into endogenous plasmids, forming cointegrates.

Impact:

• Establishes a method for integrating foreign DNA into Rhodobacter sphaeroides using R89S-derived plasmids.
• Provides insights into bacterial plasmid integration mechanisms and cointegrate formation.
• Facilitates genetic manipulation and functional studies of Rhodobacter sphaeroides.