Crystallization and preliminary X-ray diffraction data for the aconitase form of human iron-regulatory protein 1

Iron-regulatory proteins (IRPs) 1 and 2 are closely related molecules involved in animal iron metabolism. Both proteins can bind to specific mRNA regions called iron-responsive elements and thereby control the expression of proteins involved in the uptake, storage and utilization of iron. In iron-replete cells, IRP1, but not IRP2, binds a [4Fe-4S] cluster and functions as a cytoplasmic aconitase, with simultaneous loss of its RNA-binding ability. Whereas IRP2 is known to be involved in Fe homeostasis, the role of IRP1 is less clear; it may provide a link between citrate and iron metabolisms and be involved in oxidative stress response. Here, two crystal forms of the aconitase version of recombinant human IRP1 are reported. An X-ray fluorescence measurement performed on a gold-derivative crystal showed the unexpected presence of zinc, in addition to gold and iron. Both native and MAD X-ray data at the Au, Fe and Zn absorption edges have been collected from these crystals.

Published in:
Acta Crystallogr Sect F Struct Biol Cryst Commun, 61, Pt 5, 482-5
Laboratoire de Cristallographie et Cristallogenese des Proteines, Institut de Biologie Structurale Jean-Pierre Ebel, CEA/CNRS/Universite Joseph Fourier, Grenoble, France.

 Record created 2008-02-25, last modified 2018-07-07

Rate this document:

Rate this document:
(Not yet reviewed)