[Creation of genomic DNA libraries for Pseudomonas mallei and Pseudomonas pseudomallei]
Abstract:
The genomic libraries of P. mallei and P. pseudomallei species were constructed in Escherichia coli. The chromosomal DNA of P. pseudomallei C-141 strain has been cloned into the cosmid vector pHC79 and the broad host range plasmid vector pES154. The chromosomal DNA of P. mallei [symbol: see text]-5 strain has been cloned into the plasmid vector pSUP202. The recombinant clones of the genomic libraries were screened by the enzyme-linked immunoadsorbent assay (ELISA) to detect the production of Pseudomonas antigens: 28 clones were positive. Twelve recombinant strains demonstrated specific antigenic determinants of P. mallei and P. pseudomallei by immunoblotting. Cloned proteins of P. mallei and P. pseudomallei have molecular weights from 30 to 70 kD. A new method for introducing foreign genes into Pseudomonas genomes is offered. P. mallei strains with the chromosomally integrated plasmids pSM are universal recipients for ColEI-based cloning vectors.
Insights
Researchers created genomic libraries for Pseudomonas mallei and Pseudomonas pseudomallei in E. coli. They identified specific antigens and developed a new method for gene transfer in Pseudomonas.
Area of Science:
- Microbiology and Genomics
- Bacterial genetics and molecular biology
Context:
- Genomic libraries are essential for understanding bacterial species.
- Pseudomonas mallei and Pseudomonas pseudomallei are significant bacterial pathogens.
Purpose:
- To construct and screen genomic libraries of P. mallei and P. pseudomallei.
- To identify specific antigenic determinants and develop novel gene transfer methods.
Summary:
- Genomic libraries of P. mallei and P. pseudomallei were created in Escherichia coli using cosmid and plasmid vectors.
- Screening identified 28 positive clones via ELISA for Pseudomonas antigens, with 12 showing specific determinants via immunoblotting.
- Cloned proteins ranged from 30-70 kD; a new method for foreign gene introduction into Pseudomonas genomes was proposed, utilizing P. mallei strains as recipients.
Impact:
- Facilitates further research into P. mallei and P. pseudomallei pathogenesis and diagnostics.
- Enables the development of new genetic tools for Pseudomonas species.
- Provides a foundation for potential vaccine development and therapeutic strategies.
