ACO1
Function
Bifunctional iron sensor that switches between 2 activities depending on iron availability (PubMed:1281544, PubMed:1946430, PubMed:8041788). Iron deprivation, promotes its mRNA binding activity through which it regulates the expression of genes involved in iron uptake, sequestration and utilization (PubMed:1281544, PubMed:1946430, PubMed:23891004, PubMed:8041788). Binds to iron-responsive elements (IRES) in the untranslated region of target mRNAs preventing for instance the translation of ferritin and aminolevulinic acid synthase and stabilizing the transferrin receptor mRNA (PubMed:1281544, PubMed:1946430, PubMed:23891004, PubMed:8041788).
Conversely, when cellular iron levels are high, binds a 4Fe-4S cluster which precludes RNA binding activity and promotes the aconitase activity, the isomerization of citrate to isocitrate via cis-aconitate.
Sequence Similarities
Belongs to the aconitase/IPM isomerase family.
Cellular localization
- Cytoplasm
- Cytosol
Alternative names
IREB1, ACO1, Cytoplasmic aconitate hydratase, Aconitase, Citrate hydro-lyase, Ferritin repressor protein, Iron regulatory protein 1, Iron-responsive element-binding protein 1, IRP1, IRE-BP 1