Novel Acinetobacter baumannii Myovirus TaPaz Encoding Two Tailspike Depolymerases: Characterization and...

Area of Science:

• Microbiology
• Virology
• Biochemistry

Background:

• Acinetobacter baumannii is a major cause of hospital-acquired infections.
• Bacteriophages targeting A. baumannii are crucial for controlling infections.
• Capsular polysaccharides (CPSs) are key receptors for bacteriophages and influence bacterial virulence.

Purpose of the Study:

• To characterize the novel myovirus TaPaz infecting A. baumannii.
• To investigate the genomic organization and host interaction strategies of TaPaz.
• To identify and evaluate the function of TaPaz's polysaccharide-degrading enzymes.

Main Methods:

• Isolation and characterization of bacteriophage TaPaz.
• Genome sequencing and analysis of TaPaz.
• Purification and biochemical testing of recombinant tailspike depolymerases (TSDs).

Main Results:

• TaPaz possesses a 93,703 bp double-stranded DNA genome with 178 open reading frames.
• Two distinct tailspike depolymerase genes were identified within the TaPaz genome.
• One recombinant TSD specifically cleaved the K47 capsular polysaccharide of A. baumannii via hydrolysis.

Conclusions:

• The novel myovirus TaPaz offers insights into A. baumannii-phage interactions.
• TaPaz encodes specific polysaccharide-degrading enzymes with potential therapeutic applications.
• The characterized tailspike depolymerase demonstrates targeted activity against K47 A. baumannii strains.