The aconitase family contains a diverse group of iron-sulphur (Fe-S) i
somerases and two types of iron regulatory protein (IRP). Structural c
omparisons have revealed three architecturally distinct variants in wh
ich one of the four structural domains is covalently linked at either
the amino-or carboxy-terminal end of a single polypeptide or else this
domain exists as an independent subunit.