Dissimilar plasmids isolated from Pseudomonas diminuta MG and a Flavobacterium sp. (ATCC 27551) contain identical opd...

Area of Science:

• Microbiology
• Molecular Biology
• Environmental Science

Background:

• Organophosphate-degrading (opd) genes are crucial for bioremediation.
• The opd gene was previously identified on a plasmid in Pseudomonas diminuta.
• Investigating the origin and distribution of such genes is important for understanding microbial adaptation.

Purpose of the Study:

• To determine if the opd gene from Flavobacterium sp. is identical to the known opd gene in Pseudomonas diminuta.
• To investigate the genetic context and plasmid location of the opd gene in Flavobacterium sp.

Main Methods:

• Plasmid DNA isolation from Flavobacterium sp. (ATCC 27551) and Pseudomonas diminuta.
• Restriction endonuclease digestion of plasmid DNAs.
• DNA-DNA hybridization studies to compare opd gene sequences and locations.

Main Results:

• The opd gene from Flavobacterium sp. (ATCC 27551) was found to be identical in sequence to the plasmid-borne opd gene of Pseudomonas diminuta.
• Hybridization studies revealed that these identical opd sequences are located on distinct plasmids in the two bacterial species.
• The opd gene in Flavobacterium sp. was derived from a 43-kilobase-pair plasmid, designated pSM55.

Conclusions:

• The identical organophosphate-degrading (opd) gene sequences in Flavobacterium sp. and Pseudomonas diminuta are encoded on dissimilar plasmids.
• This finding suggests horizontal gene transfer or common ancestry of these genes across different bacterial hosts.
• Understanding the plasmid-borne nature of opd genes is vital for developing effective bioremediation strategies.