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Proposed model of phage PNJ1809-36 recognizing the K1 capsule of E. coli DE058. (A) Phage recognizing host bacteria with the K1 capsule. (B) K1 capsule (primary receptor) is recognized and degraded by the tail protein ORF261 of phage. This allows the other tail protein to have access to bind LPS (secondary receptor). (C) Phage PNJ1809-36 recognizes and binds R1 LPS. (D) The other tail protein binds to the penultimate galactose (Gal I) as the specific site.
