Pantoea agglomerans T6SS effectors reside in hotspots with combinatorial antibacterial and antiviral arsenals.

Pantoea agglomerans encodes an extensive T6SS effector arsenal where most effectors sit in dynamic chromosomal and megaplasmid hotspots outside the T6SS cluster.

• Why it matters: Competitive bacteria must fight rival microbes while resisting bacteriophage predation, yet how T6SS effector repertoires evolve and where they are organized remains unclear.
• What they did: Using proteomics plus comparative genomics, the study mapped the T6SS effector landscape across P. agglomerans strains and analyzed variable hotspot loci for cargo organization.
• The result: Hotspots function as “genomic armories” that co-localize antibacterial weapons with anti-phage defense systems, including a newly validated T6SS effector and the anti-phage defense system Juno.

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