A generalized transducing bacteriophage for Serratia marcescens.

Area of Science:

• Microbiology
• Bacteriophage Research
• Molecular Genetics

Background:

• Auxotrophic mutants are crucial tools for studying bacteriophage-host interactions.
• Transposon mutagenesis, specifically with Tn5, is a common method for generating such mutants.
• Identifying novel bacteriophages with broad host ranges is essential for genetic applications.

Purpose of the Study:

• To construct and characterize a collection of auxotrophic mutants in Serratia marcescens.
• To screen for bacteriophages capable of generalized transduction using these mutants.
• To identify and preliminarily characterize a novel bacteriophage with transduction capabilities.

Main Methods:

• Tn5 mutagenesis was employed on Serratia marcescens 2170 harboring plasmid pTroy11.
• A collection of 25 auxotrophic mutants was generated.
• Twelve bacteriophages from natural sources were screened for transduction efficiency.
• Phage 3M was isolated and subjected to preliminary characterization.

Main Results:

• A set of 25 Tn5-induced auxotrophic mutants was successfully constructed.
• Only one of the twelve screened bacteriophages, designated phage 3M, demonstrated the ability to transduce all tested Tn5 insertions.
• Preliminary characterization suggests that bacteriophage 3M belongs to the Myoviridae family.

Conclusions:

• The generated auxotrophic mutants provide a valuable tool for screening generalized transducing bacteriophages.
• Phage 3M exhibits broad-spectrum transduction capabilities within the tested mutant collection.
• Phage 3M represents a promising candidate for further investigation in microbial genetics and phage therapy.