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Mutational Analysis of the Cysteine-Rich Region of the Iron-Responsive GATA Factor Fep1. Role of Individual Cysteines as [2Fe-2S] Cluster Ligands.
Cell Biochemistry and Biophysics 2018 May 15
Fep1, the iron-dependent GATA-type transcriptional repressor of the methylotrophic yeast Pichia pastoris, has a dimeric structure and binds an iron-sulfur cluster of the [2Fe-2S] type. In this work, we extend the characterization of this protein by analysis of the optical and CD spectroscopic properties of a set of mutants where cysteines within the conserved Cys-X5 -Cys-X8- Cys-X2 -Cys motif have been targeted, in order to evaluate their role as [2Fe-2S] ligands. The results suggest that all four cysteine residues are essential because replacing them with serines in different combinations invariably produces a protein unable to correctly bind the [2Fe-2S] cluster.
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