Probable plastid transporter that may play a role in iron chelation, storage or sequestration under limiting iron conditions. In presence of exogenous antibiotics, may allow opportunistic entry of multiple aminoglycoside antibiotics into the chloroplast. Widely expressed. Down-regulated by iron deficiency. No visible phenotype under normal growth conditions, but plants are resistant to several aminoglycoside antibiotics, such as kanamycin, streptomycin, gentamicin, amikacin, tobramycin and apramycin. Belongs to the ferroportin (FP) (TC 2.A.100) family. SLC40A subfamily.