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Zinc binding protein ZnuA. These proteins have been shown to function as initial receptors in the ABC uptake of Zn2+. They belong to the TroA superfamily of periplasmic metal binding proteins that share a distinct fold and ligand binding mechanism. They are comprised of two globular subdomains connected by a single helix and bind their specific ligands in the cleft between these domains. A typical TroA protein is comprised of two globular subdomains connected by a single helix and can bind the metal ion in the cleft between these domains. In addition, these proteins sometimes have a low complexity region containing a metal-binding histidine-rich motif (repetitive HDH sequence).
Jiyao W et al.(2023). "The conserved domain database in 2023.",