wichita.edu
…PA binds to host cellular receptors, and after proteolytic processing assembles into heptameric (Lacy et al., PNAS 2004) or octameric (Kintzer et al., JMB 2009) ring-shaped structures called pre-pores. These pre-pore structures allow EF and LF to bind, and the entire complex is endocytosed into the host cell. Eventually, the resulting endosome becomes…
https://www.wichita.edu/academics/fairmount_las/chemistry/_faculty/Bann2.php