Cyanochelin uptake reveals an exclusively cyanobacterial class of AMIN-domain TonB-dependent transporters
This study functionally characterizes a cyanobacterial-specific TonB-dependent transporter system for the siderophore cyanochelin B, identifying an exclusive AMIN-domain TBDT (CctA) and its substrate-binding partner (CctB) as sufficient for iron acquisition while establishing *Synechocystis* as a model for heterologous expression of cyanobacterial uptake mechanisms.