This entry represents the receptor binding domain of a variety of bacteriophage. The cell wall of S. aureus typically contains poly-ribitol phosphate type wall teichoic acid (WTA), which is modified with D-alanine and N-acetyl-glucosamine (GlcNAc). It has been shown that phage psi11 requires GlcNAc residues on WTA for adsorption8. Gp45 of phage psi11 was identified and characterized as the receptor-binding protein (RBP) [3]. This entry represents the 5 bladed beta propeller platform domain that has been suggested to bind to the GlcNac substrate [1].

1: Structure of the host-recognition device of Staphylococcus aureus phage varphi11. Koc C, Xia G, Kuhner P, Spinelli S, Roussel A, Cambillau C, Stehle T; Sci Rep. 2016;6:27581. PMID:27282779

2: Structure and genome ejection mechanism of Staphylococcus aureus phage P68. Hrebik D, Stverakova D, Skubnik K, Fuzik T, Pantucek R, Plevka P; Sci Adv. 2019;5:eaaw7414. PMID:31663016

3: An essential role for the baseplate protein Gp45 in phage adsorption to Staphylococcus aureus. Li X, Koc C, Kuhner P, Stierhof YD, Krismer B, Enright MC, Penades JR, Wolz C, Stehle T, Cambillau C, Peschel A, Xia G; Sci Rep. 2016;6:26455. PMID:27212064