Physical characterization of mini-mu and mini-D108

Area of Science:

• Molecular Biology
• Genetics
• Microbiology

Background:

• Phages Mu and D108 are temperate bacteriophages with complex genomes.
• Transposons, like Tn9, can mediate genomic rearrangements within phage DNA.
• Internal deletions can significantly alter phage lytic functions.

Purpose of the Study:

• To isolate and characterize novel phage derivatives with internal deletions.
• To investigate the genetic structure and properties of these deleted phages.
• To develop tools for genetic manipulation using modified phages.

Main Methods:

• Isolation of deletion derivatives from phages Mu and D108.
• Generation of deletions using IS1 components of the Tn9 transposon.
• Physical characterization via electron microscopy and restriction enzyme digestion.
• Incorporation of antibiotic resistance markers for selection.

Main Results:

• Successfully generated mini-Mu and mini-D108 phages with internal deletions.
• Deletions removed most lytic functions while preserving key genes (A, B) or gene A and phage ends.
• Physical characterization confirmed the structure of the deleted derivatives.
• Mini-Mu and mini-D108 carry antibiotic resistance markers.

Conclusions:

• Mini-Mu and mini-D108 are viable deletion derivatives of phages Mu and D108.
• These mini-phages retain essential genetic components for potential applications.
• The study provides a foundation for using these modified phages in genetic studies.