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Metal binding protein AdcA. These proteins have been shown to function in the ABC uptake of Zn2+ and Mn2+ and in competence for genetic transformation and adhesion. The AdcA proteins belong to the TroA superfamily of helical backbone metal receptor proteins that share a distinct fold and ligand binding mechanism. They are comprised of two globular subdomains connected by a long alpha helix and they bind their ligand in the cleft between these domains. In addition, many of these proteins have a low complexity region containing metal binding histidine-rich motif (repetitive HDH sequence).
Jiyao W et al.(2023). "The conserved domain database in 2023.",