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Dickeya solani  is a recently emerged virulent bacterial potato pathogen that poses a major threat to world agriculture. Because of increasing antibiotic resistance and growing limitations in antibiotic use, alternative antibacterials such as bacteriophages are being developed.  Myoviridae  bacteriophages recently re-ranked as a separate  Ackermannviridae  family, such as phage PP35 described in this work, are the attractive candidates for this bacterial biocontrol. PP35 has a very specific host range due to the presence of tail spike protein PP35 gp156, which can depolymerize the  O -polysaccharide (OPS) of  D. solani . The  D. solani  OPS structure, →2)-β- D -6-deoxy- D -altrose-(1→, is so far unique among soft-rot  Pectobacteriaceae , though it may exist in non-virulent environmental  Enterobacteriaceae . The phage tail spike depolymerase degrades the shielding polysaccharide, and launches the cell infection process. We hypothesize that non-pathogenic commensal bacteria may maintain the population of the phage in soil environment.

frontiers in microbiology

Host Specificity of the Dickeya Bacteriophage PP35 Is Directed by a Tail Spike Interaction With Bacterial O-Antigen, Enabling the Infection of Alternative Non-pathogenic Bacterial Host