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- W2052912386 abstract "Genetic experiments have established that IscU is involved in maturation of [Fe−S] proteins that require either [2Fe-2S] or [4Fe-4S] clusters for their biological activities. Biochemical studies have also shown that one [2Fe-2S] cluster can be assembled in vitro within each subunit of the IscU homodimer and that these clusters can be reductively coupled to form a single [4Fe-4S] cluster. In the present work, it is shown that the [4Fe-4S] cluster-loaded form of A. vinelandii IscU, but not the [2Fe-2S] cluster-loaded form, can be used for intact cluster transfer to an apo form of A. vinelandii aconitase A, a member of the monomeric dehydratase family of proteins that requires a [4Fe-4S] cluster for enzymatic activity. The rate of [4Fe-4S] cluster transfer from IscU to apo-aconitase A was not affected by the presence of the HscA/HscB co-chaperone system and MgATP. However, an altered form of a [4Fe-4S] cluster-containing IscU, having the highly conserved aspartate-39 residue substituted with alanine, is an effective inhibitor of wild-type [4Fe-4S] cluster-loaded IscU-directed activation of apo-aconitase A. In contrast, neither the clusterless form of IscU nor the [2Fe-2S] cluster-loaded form of IscU is an effective inhibitor of IscU-directed apo-aconitase A activation. These results are interpreted to indicate that the [2Fe-2S] and [4Fe-4S] cluster-loaded forms of IscU adopt different conformations that provide specificity with respect to the maturation of [2Fe-2S] and [4Fe-4S] centers in proteins." @default.
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- W2052912386 date "2007-05-17" @default.
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- W2052912386 title "In Vitro Activation of Apo-Aconitase Using a [4Fe-4S] Cluster-Loaded Form of the IscU [Fe−S] Cluster Scaffolding Protein" @default.
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- W2052912386 doi "https://doi.org/10.1021/bi6026665" @default.
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