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An XAS investigation of the nickel site structure in the transcriptional regulator InrS.

Carr, Carolyn E. and Foster, Andrew W. and Maroney, Michael J. (2017) 'An XAS investigation of the nickel site structure in the transcriptional regulator InrS.', Journal of inorganic biochemistry., 177 . pp. 352-358.


InrS (Internal nickel-responsive Sensor) is a transcriptional repressor of the nickel exporter NrsD and de-represses expression of the exporter upon binding Ni(II) ions. Although a crystal structure of apo-InrS has been reported, no structure of the protein with metal ions bound is available. Herein we report the results of metal site structural investigations of Ni(II) and Cu(II) complexes of InrS using X-ray absorption spectroscopy (XAS) that are complementary to data available from the apo-InrS crystal structure, and are consistent with a planar four-coordinate [Ni(His)2(Cys)2] structure, where the ligands are derived from the side chains of His21, Cys53, His78, and Cys82. Coordination of Cu(II) to InrS forms a nearly identical planar four-coordinate complex that is consistent with a simple replacement of the Ni(II) center by Cu(II).

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Publisher statement:© 2017 This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Date accepted:05 August 2017
Date deposited:05 October 2017
Date of first online publication:10 August 2017
Date first made open access:10 August 2018

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