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Metal binding protein ZntC. These proteins are predicted to function as initial receptors in ABC transport of metal ions. They 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 bind their specific ligands in the cleft between these domains. In addition, many of these proteins possess a metal-binding histidine-rich motif (repetitive HDH sequence).
Jiyao W et al.(2023). "The conserved domain database in 2023.",