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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Structural basis for metal sensing by CnrX.

Juliette Trepreau¹, Eric Girard, Antoine P Maillard

¹Institut de Biologie Structurale Jean-Pierre Ebel, UMR 5075, CNRS-CEA-UJF Grenoble 1, 41, rue Jules Horowitz, 38027 Grenoble Cedex, France.

Journal of Molecular Biology

|March 19, 2011

Summary

This summary is machine-generated.

The CnrX protein

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Area of Science:

Microbiology
Structural Biology
Biochemistry

Background:

CnrX is a key component of the CnrYXH complex in *Cupriavidus metallidurans* CH34.
This complex mediates resistance to cobalt and nickel.
CnrX functions as the metal sensor and signal modulator within the complex.

Purpose of the Study:

To determine the atomic structure of the soluble domain of CnrX.
To investigate the structural basis of metal binding and its effect on CnrX function.
To elucidate the mechanism of signal transduction in the CnrYXH complex.

Main Methods:

X-ray crystallography was used to determine the atomic structure of CnrX.
Structures were obtained for Ni-bound, Co-bound, and Zn-bound forms of CnrX.
Analysis of protein-metal interactions and dimer packing.

Main Results:

The atomic structures of CnrX in Ni-bound, Co-bound, and Zn-bound states were determined.
Ni and Co binding activate the complex, while Zn binding results in an inactive state.
Metal-specific fine-tuning of CnrX dimer packing was observed, revealing intra- and interprotomer interactions.

Conclusions:

The findings suggest an allosteric mechanism for signal activation and modulation by Ni and Co.
The structural data provides insights into how the CnrYXH complex is switched on.
A model for signal propagation through the membrane via the CnrYXH complex is proposed.