Gabija restricts phage circularization and DNA replication.

Gabija inhibits phage circularization and DNA replication by targeting linear DNA lacking RecBCD activity, reducing phage proliferation in Pseudomonas aeruginosa.

• Why it matters: Understanding how bacteria distinguish between self and invader DNA is crucial for developing new antimicrobial strategies and comprehending bacterial immune defenses.
• What they did: The study examined Gabija's mechanism by analyzing phage-host interactions, focusing on phage-encoded DNA end-binding proteins and their role in sensitizing phages to Gabija, using lambda-like phages and mutant escape variants.
• The result: Gabija effectively prevents phage genome circularization and replication when linear DNA lacks RecBCD activity, revealing a novel immune strategy that targets foreign linear DNA while sparing host DNA.