Volbeda, Anne, Pellicer Martinez, Ma Teresa, Crack, Jason C., Amara, Patricia, Gigarel, Océane, Munnoch, John T., Hutchings, Matthew I., Darnault, Claudine, Le Brun, Nick E. and Fontecilla-Camps, Juan C. (2019) Crystal structure of the transcription regulator RsrR reveals a [2Fe-2S] cluster coordinated by Cys, Glu and His residues. Journal of the American Chemical Society, 141 (6). 2367–2375. ISSN 0002-7863

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Abstract

The recently discovered Rrf2 family transcriptional regulator RsrR coordinates a [2Fe-2S] cluster. Remarkably, binding of the protein to RsrR-regulated promoter DNA sequences is switched on and off through the facile cycling of the [2Fe-2S] cluster be-tween +2 and +1 states. Here, we report high resolution crystal structures of the RsrR dimer, revealing that the [2Fe-2S] cluster is asymmetrically coordinated across the RsrR monomer-monomer interface by two Cys residues from one subunit and His and Glu residues from the other. To our knowledge, this is the first example of a protein bound [Fe-S] cluster with three different amino acid side chains as ligands, and of Glu acting as ligand to a [2Fe-2S] cluster. Analyses of RsrR structures revealed a conformation-al change, centered on Trp9, which results in a significant shift in the DNA-binding helix-turn-helix region.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Chemistry Faculty of Science Faculty of Science > School of Biological Sciences
Depositing User:	LivePure Connector
Date Deposited:	22 Jan 2019 10:30
Last Modified:	09 Jun 2022 00:20
URI:	https://ueaeprints.uea.ac.uk/id/eprint/69645
DOI:	10.1021/jacs.8b10823

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