Abstract
A ubiquitous element, iron constitutes five percent of the earth’s crust. Iron flavoproteins, hydroperoxidases, cytochrome P450, oxygenases and ribonucleotide reductase are among numerous iron-dependent enzymes.1 Accessibility of iron by procaryotic and eucaryotic unicellular and multicellular organisms is limited by the poor aqueous solubility of iron. Soluble ferric iron cerncentrations are only 10-18M in neutral aqueous solutions.2,3 Bacteria, on the other hand, require iron concentrations of 1 × 10-6 to 5 × 10-8M for efficient growth.4 Bacteria and fungi secrete into their environment low molecular weight (500 – 1000 dalton) non-peptide ferric iron specific chelators known as siderophores to accomplish iron assimilation.5–8 In contrast, most mammalian cells utilize the protein transferrin as their iron transport chelators.9 One transferrin molecule contains two sites capable of binding one ferric iron atom each. Iron binding is pH sensitive with best activity at pH values above 6.5.9 SV40-transformed BALB/3T3 cells grown in α-picolinic acid do not have a transferrin requirement.10
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Elliott, G.T. (1987). Catecholamide Iron Chelators: Antiproliferative Activity on Human Pathogens and Neoplasm. In: Sorenson, J.R.J. (eds) Biology of Copper Complexes. Experimental Biology and Medicine, vol 16. Humana Press. https://doi.org/10.1007/978-1-4612-4584-1_30
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DOI: https://doi.org/10.1007/978-1-4612-4584-1_30
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