This family represents the NikD subunit of a multisubunit nickel import ABC transporter complex. Nickel, once imported, may be used in urease and in certain classes of hydrogenase and superoxide dismutase. NikD and NikE are homologous. [Transport and binding proteins, Cations and iron carrying compounds]
Jiyao W et al.(2023). "The conserved domain database in 2023.",