This entry represents the ph 6 antigen (also known as adhesin or antigen 4) from Yersinia pestis, which is part of fimbriae, necessary for full virulence [1,2]. It mediates bacterial attachment to alveolar cells of the lung.

1: Structural basis for the specific recognition of dual receptors by the homopolymeric pH 6 antigen (Psa) fimbriae of Yersinia pestis. Bao R, Nair MK, Tang WK, Esser L, Sadhukhan A, Holland RL, Xia D, Schifferli DM; Proc Natl Acad Sci U S A. 2013;110:1065-1070. PMID:23277582

2: Structural basis for Myf and Psa fimbriae-mediated tropism of pathogenic strains of Yersinia for host tissues. Pakharukova N, Roy S, Tuittila M, Rahman MM, Paavilainen S, Ingars AK, Skaldin M, Lamminmaki U, Hard T, Teneberg S, Zavialov AV; Mol Microbiol. 2016;102:593-610. PMID:27507539