Identification of an R1-type pyocin previously misannotated as a prophage in Pseudomonas aeruginosa ATCC 27853

isolate via spot-test killing assays and absorbance-based assays. Transmission electron microscopy revealed R-type pyocin particles averaging 133 nm in length. This misidentification of a pyocin as a prophage critically underscores the inherent limitations of current bioinformatic tools in accurately distinguishing between these distinct phage-derived elements, thereby highlighting the urgent need for more refined annotation methodologies. Accurate identification of such elements is essential, as they may influence experimental outcomes and provide new insights into bacterial defence mechanisms.