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The Bifunctional Iron-Responsive Element Binding Protein/Cytosolic Aconitase: The Role of Active-Site Residues in Ligand Binding and Regulation
Ist Teil von
Proceedings of the National Academy of Sciences - PNAS, 1994-07, Vol.91 (15), p.7321-7325
Ort / Verlag
United States: National Academy of Sciences of the United States of America
Erscheinungsjahr
1994
Quelle
MEDLINE
Beschreibungen/Notizen
The iron-responsive element binding protein/cytosolic aconitase functions as either an RNA binding protein that regulates the uptake, sequestration, and utilization of iron or an enzyme that interconverts citrate and isocitrate. These mutually exclusive functions are regulated by changes in cellular iron levels. By site-directed mutagenesis we show that (i) ligation of a [4Fe-4S] cluster is necessary to inactivate RNA binding and activate enzyme function in vivo, (ii) three of four arginine residues of the aconitase active site participate in RNA binding, and (iii) aconitase activity is not required for iron-mediated regulation of RNA binding.