This family of ABC substrate-binding proteins is observed primarily in close proximity with proteins localized to the cell wall and bearing the NEAT (NEAr Transporter, pfam05031) heme-binding domain. IsdE has been shown to bind heme and is involved in the process of scavenging heme for the purpose of obtaining iron.
Jiyao W et al.(2023). "The conserved domain database in 2023.",